In 2003, Joe Satriani boarded the G3 tour bus carrying a problem that would have broken a lesser guitarist’s spirit. He needed a single amplifier — one head — that could produce a lush clean tone for cascading arpeggios, a warm, compressed crunch for melodic sustain, and enough gain on tap for the explosive leads that had made him the world’s best-selling instrumental guitarist. His Peavey engineers were back in Meridian, Mississippi, sending revised prototypes out to meet him at venues across the world, tweaking circuits based on his notes after every show. The result, unveiled at the 2004 Winter NAMM show in Anaheim, California, was the Peavey JSX — a three-channel, 120-watt all-tube head that embedded not just Satriani’s tonal preferences but the institutional memory of three previous Peavey designs in a single chassis.
The JSX occupies a specific moment in Peavey’s story: the years between the original 5150/EVH era and the brand’s late-period Invective.120 collaboration with Misha Mansoor. Unlike those bookends, the JSX was built for a guitarist whose vocabulary is melodic rather than metallic, rhythmic rather than percussive. The circuits reflect that — and so does the way Satriani actually used it live, which turns out to be more interesting than most people assume.
How the JSX Got Made: The 2003 G3 Tour Prototype Sessions
The story of the JSX begins with the Peavey Triple XXX, a three-channel all-tube head the company had released as its high-gain flagship. Satriani liked elements of the XXX platform but felt it wasn’t quite his instrument. He brought his requirements to Peavey’s amp design team, specifically to engineer James Brown (the designer, not the Godfather of Soul), and the collaboration began with a set of modified XXX-based prototypes labeled “JSX XXX” on the faceplate — the prototype units Satriani physically toured with in 2003.
The design-on-the-road process was unusually methodical. Brown and the Peavey team would ship a revised prototype to the next tour stop, Satriani would play it through an entire G3 show at stage volume, and the feedback would go back to Meridian. This iterative, live-volume testing process meant the JSX was voiced for real-world stage performance, not a bedroom test bench. It also explains why the three channels ended up pulling from three different Peavey lineages rather than being uniform variations on a single circuit idea.
Satriani’s input was highly specific about two of the three channels. In his own words, quoted in a 2018 MusicRadar career retrospective: “I requested the crunch channel from the Peavey Vintage 50, because I felt like it was the greatest Peavey amp ever made. The designer, James Brown, was able to make it part of the JSX amp with some additional EQ curves. That sound is really something — on the song If I Could Fly, you can hear a very long extended solo. That’s where this amp really shined and sounded beautiful. That particular channel I think was the highlight of James’s career… it was very compressed but gorgeous sounding, with a classiness that was wonderful.”
On the clean channel: “We were able to look at the clean and take the best parts of a Marshall 6100 and improve upon them. The sound of a Satchurator or DS-1 into the clean channel, with the amp cranked to 115dB was great — in fact, way better than the 6100. We recorded a lot of great stuff in the studio and live using that.”
On the Ultra channel, Satriani was candid about the limitations of the design process: “The final channel I had little input on… you think you have all the time in the world to get things right, and before you know it, there are deadlines and you’ve released something that you feel is 90% there. The drive channel idea came from the Triple X, without some of that midrange, which I always felt was excessive for classic rock, though it still didn’t get used much. I’d use my Satchurator into the clean channel for my live performances.”
That last sentence is the key insight that every JSX buyer should tattoo on their forearm: the man who designed the amp ran overdrive pedals into the clean channel rather than touching the Ultra channel in live performance. The JSX’s most famous tone — the singing lead sound across Satriani’s mid-2000s concert recordings — is coming from channel one, not channel three.
The production JSX was launched at the January 2004 NAMM show. The 212 combo followed at NAMM 2005. A 50-watt two-channel variant (the JSX 50) was announced at Winter NAMM 2009 with Satriani declaring “I see no reason why you have to sacrifice anything, and we’ve just proved it” — but it was never commercially released, making all surviving units of that variant rare prototypes. A second ancillary product, the JSX Mini Colossal (5W, 1×8″ speaker, 1×12AX7 + 1×EL84, built-in tremolo and XLR out), did reach production and became a cult favourite for its recording utility.
The Peavey Lineage: Where the JSX Fits
Peavey Electronics was founded by Hartley Peavey in 1965 in Meridian, Mississippi and built its reputation on professional-grade gear at working-musician prices. The company’s amplifier legacy in the rock world runs through several distinct eras: the classic USA-built tube combos of the 1970s (including the Vintage 50 that Satriani so admired), the EVH 5150 collaboration that redefined high-gain metal in 1992, the Triple XXX that followed when Eddie Van Halen departed, and then the JSX as the signature-series evolution of that lineage for a very different kind of guitarist.
Understanding that sequence matters when buying used. The Peavey 5150 was a collaboration with Eddie Van Halen designed for percussive, aggressive rhythm playing and screaming harmonic-saturated leads — it was built for a guitarist who thinks in riffs. The JSX was designed for a guitarist who thinks in melodies. The circuits are fundamentally different in their approach to compression, mid-frequency presence, and clean-to-gain transitions, even though both wear the Peavey badge and run 6L6GC power tubes. Buying a JSX expecting a 5150 will disappoint you. Buying a 5150 expecting a JSX will disappoint you. They are not interchangeable.
The relationship to the Triple XXX is closer but still distinct. From the search result analysis of that platform: the JSX took the Triple XXX’s crunch channel and repurposed it as the Ultra (lead) channel, while slotting the Vintage 50 crunch in where the XXX’s crunch had been, and building a new Marshall-influenced clean channel. When Satriani’s Peavey endorsement ended around 2010, Peavey reissued the XXX architecture as the Triple XXX II. So the JSX and the XXX are genuinely related by circuit DNA, but with a different priority order for the channels and the Vintage 50 crunch as the JSX’s defining addition.
Specifications
Channel Architecture Explained
The three channels are not equal in their control layout, and that asymmetry reflects the underlying circuit philosophy. The Clean channel gets a conventional passive EQ: Bass, Middle, Treble, Volume. This is the purest channel, voiced to accept external gain sources gracefully — pedals hit it hard and it gives back a musical, compressed response rather than the harsh breakup you get when you overdrive a high-gain channel’s preamp stage.
The Crunch and Ultra channels both use active EQ, branded on the faceplate as Bottom (low-mid control), Body (midrange), and Hair (high-mid/presence). Where a passive EQ can only cut, active EQ can boost — giving each of these channels a more aggressive shaping capability than the clean. Both also get a Fat switch, which changes the timbre by expanding the low-mid response, and a per-channel Noise Gate, which is a thoughtful inclusion for high-gain players who need silences between phrases.
The two inputs (Hi Gain and Lo Gain) on the front panel effectively add another variable: the Lo Gain input reduces the input sensitivity and is useful with very hot pickups or very hot pedals if you’re clipping the input stage before you want to. Most players stay on Hi Gain.
The power amp’s 6L6GC vs EL34 swappability is worth a word. Peavey shipped four spare EL34 tubes in the box with every JSX head — an unusually generous inclusion. The reason is circuit philosophy: the JSX was voiced with 6L6GC tubes installed, which produce a tighter low end, more scooped mids, and a more distinctly American character. Drop in the EL34s and the amp shifts toward a looser, more mid-forward British character with earlier compression. Because the JSX was designed with Satriani’s Ibanez JS tone in mind — a guitar that already has considerable upper-midrange presence from its DiMarzio PAF Pro/Mo’ Joe pickups — the 6L6GC voicing creates a useful contrast rather than a redundancy. Players who want the JSX to snarl more like a Marshall should swap to EL34s. Players who want the tight American punch should stay with the stock 6L6GC. Rebias whenever you change tube types — there is a bias adjustment access point on the rear panel.
Famous Players
Joe Satriani — Confirmed, Primary
Joe Satriani is not just the nameplate endorser; he is the co-designer, road tester, and only player of consequence for whom primary-source documentation of JSX use exists at the recording and touring level. His involvement is verified across multiple independent primary sources: his own extended first-person account in MusicRadar (December 2018); the Peavey press release confirming the January 2004 NAMM launch as a signature collaboration; documented prototype development during the 2003 G3 Tour; and Reverb.com physical sale documentation of an actual 2003 prototype unit described as “Personally OWNED and TOURED.”
The albums he recorded during the JSX era (roughly 2004–2010) are the definitive sonic document of what this amp can do. “Is There Love in Space?” (Epic Records, April 13, 2004) was recorded at The Plant Studios in Sausalito, California and Studio 21 in San Francisco, immediately following the 2003 G3 prototype development period. “Super Colossal” (2006) and “Professor Satchafunkilus and the Musterion of Rock” (2008) were both recorded with the production JSX in the primary signal chain. What you’re hearing across those records — the liquid compression on the legato lines, the note-by-note articulation on fast runs, the way gain and sustain feel like they live in the same neighborhood — is the Crunch channel with Satriani’s hand on the volume knob.
His live rig of the period typically ran: Ibanez JS Series guitar → DigiTech Whammy → Vox JS Big Bad Wah → Vox Satchurator (or Boss DS-1) → JSX Clean input → Fractal Axe-FX in the effects loop for time-based effects → JSX 412 cabinets. The gain came from the pedal, not from the amp’s own preamp. This was an intentional choice: Satriani found that pedal gain into the JSX clean channel gave him a more transparent, dynamically responsive tone than the Ultra channel could provide, because the clean channel’s absence of pre-distortion compression meant his picking dynamics translated directly to the output rather than being leveled out.
He moved to the Marshall JVM410HJS (a heavily modified JVM410H developed with Marshall engineer Santiago Alvarez) around 2010, and the transition was explicit in his stated reasoning: he wanted more gain-stage personality without the compression that the JSX’s Ultra channel introduced. “I didn’t feel that was a professional-grade setup,” he said of the standard JVM’s behavior, indicating that his time with the JSX had raised his bar for what an amp should do dynamically. The Peavey era ended; the Marshall era began. The JSX remains, in his own retrospective account, one of the two most important amps of his career.
Equipboard lists approximately ten other players on the JSX. Without individual primary-source verification — meaning a photo of the specific guitarist in front of a JSX, or a published interview stating JSX use — those entries are not reproduced here as confirmed users. The JSX’s production period (2004–c.2010) creates a plausible universe of touring players who would have bought it; the amp was widely available, well-reviewed, and competitively priced. But “plausible” and “verified” are different things.
Tone Recipes and Amp Settings
1. The “If I Could Fly” Sustain Tone (Crunch Channel)
This is the tone Satriani himself highlighted as the Crunch channel’s defining use. Set the channel volume at about 4–5, Gain at 6, Bottom at 5, Body at 5, Hair at 5 (flat), Fat switch OFF. Master at whatever gives you the stage volume you need. This channel compresses early and stays compressed — notes bloom under your fingers rather than biting. Use a guitar with medium-output pickups (Satriani’s DiMarzio PAF Pro or Mo’ Joe are the reference); high-output humbuckers will push the channel into a thicker, darker zone. Roll your guitar volume to 7 for rhythm and 10 for leads.
2. The Satriani Live High-Gain Setup (Clean Channel + Pedal)
This is how Satriani actually performed live. Clean channel, Volume at 7–8, Bass at 5, Middle at 6, Treble at 6. In front of the amp: Boss DS-1 with Drive at 6–7, Tone at 4 (the low tone setting reduces the DS-1’s famous top-end fizz), Level to match or slightly exceed bypass. Or substitute a Vox Satchurator (MkI or MkII) with similar settings. The result is a mid-saturated, vocal-range-dominant high-gain tone with better note separation than the Ultra channel because the clean circuit doesn’t compress the input pre-distortion. Use the Fractal Axe-FX or a quality digital delay in the effects loop for stereo spread and sustain.
3. Ultra Channel — Modern Hard Rock
Volume at 4, Gain at 7, Bottom at 6, Body at 5, Hair at 4, Fat switch ON. The Fat switch is the key adjustment here — without it the Ultra channel can sound slightly brittle through a standard 4×12. With it engaged, the low-mid expansion fills out the chug and makes rhythm playing feel more authoritative. This is the channel that nods most strongly toward the Triple XXX lineage. Set Presence at 5, Resonance at 5 (both global controls). Works well with drop-tuned guitars and a noise gate pedal before the input, since the per-channel noise gate is more useful as a noise floor control than as a rhythm chopper.
4. Clean Ballad / Ambient Tone
Clean channel, Volume at 3, Bass at 4, Middle at 7, Treble at 6. No overdrive in front. The JSX clean is broadly described as Marshall-influenced — not Fender shimmer, but a slightly drier, midrange-forward clean that takes reverb and delay well without washing out. Run a quality reverb and a long slapback delay (380ms, single repeat, mixed at about 20%) in the effects loop. Strum slowly enough that individual notes decay before the next chord arrives. This is the setting for the quiet passages in tracks like “Midnight” or “Flying in a Blue Dream.”
5. Warm Crunch, EL34 Power Section
Swap the power tubes for EL34 (remember: rebias). Crunch channel, Volume at 5, Gain at 5, Bottom at 4, Body at 6, Hair at 5. With EL34s installed the low end loosens slightly and the mids push forward — the channel no longer sounds like it was born in Mississippi, it starts to feel like it grew up somewhere near London. Classic rock territory: power chords breathe more, single notes have a slightly rougher edge. Not where Satriani lives, but a useful expansion of what the chassis can do. Presence at 5, Resonance at 4 to trim a little of the extra low-mid body.
How It Compares to Other Amps
Peavey 5150 / 6505 Head
These are related by brand but not by circuit philosophy. The 5150 and 6505 were designed for percussive metal playing — tight, scooped, aggressive, built to make down-tuned palm-muted chords feel like a punch in the chest. The JSX’s Crunch channel is the single most different channel in the Peavey lineup from that aesthetic: compressed, warm, vocal, almost British in compression behavior. If you play melodic rock or need a genuine usable clean channel, the JSX is the right tool. If you play modern metal and need the most articulate chunk possible, the 5150/6505 is the correct choice and the JSX will feel like it’s fighting you.
Peavey Invective.120
The Invective.120 is the JSX’s spiritual successor in the Peavey signature-head tradition — another guitarist-designed 120W three-channel head with deep input from its endorser. But Misha Mansoor and Joe Satriani have almost nothing in common tonally. The Invective prioritises modern metal: a powerful noise gate, per-channel boost circuits, MIDI recall, and the kind of ultra-tight low-end response that seven and eight-string extended-range playing demands. The JSX has more musical compression and a warmer tonal palette. A player who needs both would realistically need both amps. The Invective replaced the JSX’s position in the Peavey catalogue, but it serves a different genre almost entirely.
Peavey 5150 II
The 5150 II added a dedicated clean channel to the original 5150 circuit — closing one of the JSX’s inherent comparisons before it started. But that clean channel is still voiced more aggressively than the JSX’s; it’s brighter, less compressed, and less forgiving of bright-sounding guitars. Players in the 5150 II era who wanted a Satriani-style vocal lead tone were typically adding pedals or running separate amps. The JSX was built to eliminate that patchwork; everything you need is in the chassis.
Mesa/Boogie Dual Rectifier / Solo Head
The Dual Rectifier is the JSX’s nearest competitor from a different manufacturer — another three-channel American-built all-tube head with versatility as its selling point. The Mesa is heavier, darker in the low frequencies, and more compressed on the modern channel. The JSX is more mid-forward and responsive to dynamics. Satriani was asked about the Dual Rectifier in multiple interviews and consistently avoided it in his own rigs, which tells you something about where it sits relative to his priorities. For players who need very high output volumes with maximum low-end weight, the Mesa may win. For players who need note separation and dynamic sensitivity in the mids, the JSX is typically the stronger performer.
Marshall JCM800 2203
The JCM800 is the amplifier whose clean channel characteristics Satriani wanted to improve upon in the JSX’s clean channel design. The 800’s single-channel architecture has one gain stage between the guitar and the output — which is why it responds so well to pedals. The JSX’s clean channel was engineered with similar principles in mind. Where they diverge: the 800’s single-channel limitation means every tone requires a pedal; the JSX gives you a crunch channel without a pedal, trading the 800’s raw interactivity for channel-switching convenience. Both are valid approaches. Players who prefer 100% pedal control over amp personality will stay with the 800. Players who want at least one clean-gain transition built into the amp will prefer the JSX.
The JSX 412 Cabinet: Brilliance and Its Fatal Flaw
The JSX 412 cabinet was an engineering innovation that briefly became a cautionary tale. It featured a built-in Simulated Microphone DI (SMDI) output — a line-level signal taken post-power-amp, post-speaker, designed to provide a speaker-and-cabinet-simulated direct feed to a mixing desk or interface without a microphone. Three output tone curves (Dark, Normal, Bright) and a DI Level control allowed the engineer to dial in the character. This was a genuinely ahead-of-its-time idea in the mid-2000s.
The flaw was structural. The SMDI circuit’s components were mounted inside the cabinet enclosure without adequate shock absorption, and at stage volumes — we’re talking 115dB in a concert environment — the physical vibration of four 12-inch speakers shaking inside a wooden box was enough to eventually destroy the circuit’s solder joints. The problem became acute when mixing engineers sent phantom power from their consoles into the XLR output: the circuit was not designed to handle phantom power ingress, and it would short immediately.
In Joe Satriani’s own words: “On TV when I went on the Conan O’Brien show — they fried three of my cabinets in just two minutes! I guess the world just wasn’t ready for it.” Three JSX 412 cabinets, in sequence, killed by phantom power on a network television soundstage. Peavey eventually acknowledged the design limitation. The production cabinet without the SMDI — the standard straight and slant 4×12 loaded with custom JSX 12-inch speakers — remained fully functional and is still regarded as a solid, well-built cabinet. But used-market buyers looking at JSX 412 cabinets with the SMDI feature should test that circuit carefully before purchase. A non-functional SMDI doesn’t affect the speaker output, but it affects the price.
Buying a Used JSX: What to Look For
The JSX was discontinued sometime around 2010–2011 when Satriani moved to Marshall and the Triple XXX II replaced it in Peavey’s high-gain catalogue. The used market price has settled significantly since original retail. Current Reverb and eBay listings typically land in the $400–$700 range depending on condition, generation, and whether original tubes and footswitch are included. Prices of $525 or higher represent the better-condition end of the market; anything under $400 warrants careful inspection.
When buying used, check:
- Tubes: The JSX came with four spare EL34 tubes in the box. If a used unit arrives with both the stock 6L6GC and the EL34 set, that’s a complete package and worth more. If the 6L6GC have been replaced by EL34s and the amp was biased for the new tubes, confirm the bias setting — incorrect bias kills output transformer over time.
- The footswitch: The three-button 3120 footswitch is the correct unit. Non-original footswitches will switch channels but may not illuminate the LEDs correctly. Originals in good condition add value; missing footswitches require finding a compatible replacement.
- The effects loop send level: The JSX has an active effects loop with independent send and return controls. Send the effects loop to an external device and confirm the send is clean. A degraded send buffer is not a common failure mode, but it’s worth 30 seconds to check.
- Fat switches: Both the Crunch and Ultra channels have Fat switches. These are physical toggle switches that endure years of stomping. On a used unit, confirm they click firmly between positions without wobble or shorts.
- The crunch channel: This is the amp’s most documented and most-praised channel. If a used JSX sounds dull or flat on the crunch, the most likely culprit is preamp tube decay or a biased-out power section. New preamp tubes cost less than $20 per tube and often restore a JSX to factory performance.
- Serial number and generation: Earlier production units (2004–2006) are generally considered the most consistent. Later units are functionally equivalent but have occasionally been flagged in forum discussions for PCB quality control variations. This is not a well-documented distinction, so treat it as a minor factor rather than a deal-breaker.
The JSX has no production successor in the Peavey lineup that captures the same Crunch channel character — the Vintage 50-derived circuit that Satriani called “the highlight of James Brown’s career” is unique to this platform. That makes the used-market head a genuine find for players who want a melodic rock and hard rock amp from a major American manufacturer at below $600.
Living With the JSX: Ownership Notes
At 23.5 kg (52 lbs), the JSX is a substantial carry. It was designed for touring musicians with crew, and while individual guitarists can manage it alone, don’t underestimate the weight in a one-person load-in at 1am after a late set. A rigid flight case adds another 8–12 kg. Budget for a two-person lift or a proper amp cart.
The amp runs hot — 120 watts of Class AB operation with four 6L6GC power tubes generates real heat. The ventilation slots on the rear panel need clearance: at least 4 inches of free space behind the head, more if possible. Do not place it directly against a flight case wall. In extended studio sessions, let the amp breathe between takes rather than keeping it on standby continuously for hours.
The noise gate on the Crunch and Ultra channels is a basic threshold control, not a sophisticated downward expander. For very quiet studio environments where the noise floor matters, you may want to supplement with an external gate (Boss NS-2, ISP Decimator) between guitar and input. For live use, the built-in gate is usually sufficient and convenient.
The active effects loop send/return level controls are one of the most underused features on the JSX. Many players run external effects units at unity gain and never touch these controls. But if you’re running a Fractal unit or any high-output digital processor in the loop, the return level control lets you match levels precisely and avoid clipping the power amp input. Take five minutes to calibrate it with your specific setup.
Tube life under hard use is typically 12–18 months for the power section, longer for the preamps. The bias test points are on the rear panel with the notation and target values in the manual (available as a PDF via Peavey’s archived product pages). If you’re comfortable with a multimeter and a trim pot, this is a straightforward home maintenance task. If you’re not, a tech can do it in fifteen minutes.
Frequently Asked Questions
Is the Peavey JSX the same as the Triple XXX?
Related, but not the same. Both share circuit DNA — the JSX’s Ultra channel draws from the Triple XXX’s lead channel, thinned of excess midrange. But the JSX adds a Crunch channel based on the Peavey Vintage 50 (a completely different circuit), a Marshall-influenced clean channel, and ships with 6L6GC power tubes where the Triple XXX defaulted to EL34. The JSX is a three-channel amp that synthesises elements of three distinct Peavey amplifiers; the Triple XXX is a single-philosophy high-gain machine. They sound different and serve different players.
Did Joe Satriani actually use the Ultra channel live?
By his own account: no, or very rarely. Satriani stated explicitly that he ran a Boss DS-1 or Vox Satchurator into the clean channel for his high-gain live tones, finding that combination more dynamically responsive than the Ultra channel. The crunch channel appeared on his studio recordings for melodic lead work. The Ultra channel exists and sounds capable in context, but Satriani’s documented preference is notably not to use it as his primary gain source.
What power tubes should I run — 6L6GC or EL34?
The amp was voiced for 6L6GC, so that’s the factory reference point: tighter low end, slightly scooped mids, distinctly American character. EL34s push the amp toward a British voicing — looser bottom, more midrange push, earlier compression. Neither is wrong; they’re different tools. Rebias whenever you change tube types. The amp ships with four EL34s in the box, and Peavey intended players to try both.
Can I use the JSX for metal?
Yes, with caveats. The Ultra channel handles metal, particularly classic and melodic metal where note separation matters. Modern djent or drop-tuned chugging is less well-served — the JSX’s Crunch channel compression that makes it magical for melodic playing is the same compression that blurs low-string definition at very high gain. Players who need the articulate tightness of the 6505+ Head for modern metal should buy the 6505+. Players who need melodic metal with a genuine clean channel should consider the JSX.
What speakers should I run with the JSX?
Peavey loaded the JSX 412 with custom-built 12-inch JSX speakers, described as emphasising low-end while allowing highs to cut through. For players pairing the head with a non-JSX cabinet, Celestion Vintage 30s are the most commonly reported match — their upper-midrange presence complements the JSX’s relatively warm upper-mid response. Celestion G12M Greenbacks work for the crunch and clean channels, particularly with EL34 power tubes. Avoid very dark, low-mid heavy speakers like some Eminence models — the JSX doesn’t need more warmth, it needs clarity.
Why did the JSX 412 cabinet’s DI keep breaking?
The SMDI (Simulated Microphone Direct Interface) circuit was mounted inside the physical cabinet without adequate vibration isolation. At high stage volumes, the mechanical energy from the speakers vibrated the PCB components and their solder joints into failure. Additionally, the circuit was not designed to handle phantom power ingress from mixing consoles — when a sound engineer accidentally sent +48V phantom power down the XLR cable, the circuit shorted immediately. Peavey acknowledged the issue. The speakers and cabinet box themselves are unaffected; the failure was isolated to the SMDI sub-assembly.
Is the JSX still made?
No. Production ended approximately 2010–2011 when Satriani’s Peavey endorsement concluded and he moved to Marshall. All units currently available are used. The circuit was not carried forward — the Triple XXX II, which Peavey released after the JSX era, is a different amp that returns to the original Triple XXX architecture rather than continuing the JSX’s Vintage 50-influenced design. Used market prices are stable in the $400–$700 range for good-condition units.
How does the JSX sound compared to the Marshall JVM410H?
Joe Satriani himself transitioned from JSX to a modified JVM410H (the JVM410HJS signature) and explained the distinction: the JVM gave him more channel-to-channel personality and less compression. The standard JSX crunch and ultra channels apply significant gain-stage compression that produces that gorgeous, even sustain on melodic playing but can mask picking dynamics at lower volumes. The JVM410HJS was re-engineered to reduce compression specifically. For players who want to feel the difference between a hard attack and a soft one in the distortion, the Marshall may win. For players who want every note to sustain evenly under a melodic phrase, the JSX crunch channel is arguably still unmatched in the Peavey catalogue.