Jump to content

Trace Elliot AH400-SMX & GP12-SMX


Recommended Posts

50461016126_74a49b9565_h.jpgSmx 1020 by VTypeV4, on Flickr


As the decade of the yuppy, Boy George, questionable fashion styles and many other cliches associated with the 1980s was coming to a close, Trace Elliot were riding on the wave of their success of their (then) highly sophisticated and high powered range of bass amplifiers. Noted for their unique sound and unmistakable aesthetics which included a large graphic EQ, green facia paint and a glowing UV strip, Trace amps were seen behind many of the great players of the time. The then current 'Series 6' range introduced in around '88 was still hip, modern and built on the reputation of the previous 'Mark V' series with a notable extension of the 11-band range now up to twelve which were coupled to improved and more powerful (up to 600w) solid state output stages. There was also a range of valve amplifiers with brushed steel panels which had modified versions of the GP7 and GP12 pre-amplifiers and multi-tube output stages up to 380w which were known as the 'Twin Valve', 'Quattra Valve' and 'Hexa Valve' models. These were developed from the equally sought after VA models - high times, indeed.

As an ever innovative company, Trace Elliot had not stood still and continued developing their latest range of bass rigs which appeared on the market in around '93. Both 7 and 12-band models had additional features (such as EQ balance, compression and valve stages) and improvements over the previous Series 6 versions. The new range designed by Clive Button was to be known as the 'Sound Management' series with the pre-amp stages now known as the GP7-SM and GP12-SMX respectively. The SM models had an update in '97 (around the time of the Gibson purchase) to become the SMC range now with a simplified dual band compressor whilst SMX models would almost last until the end of the millennium virtually unchanged and to many, represent the very pinnacle of Trace Elliot amplification.

Sadly, after 2000, production was being wound off by the bosses at Gibson and the replacement GP12X never saw the same success as its predecessor. Problems in terms of reliability and build quality also became apparent which did little aid the reputation of theses models and by 2002, production had stopped. Fast forward to 2005 and the brand was now owned by Peavey who had developed new 'Trace Elliot' amplifiers built at Peavey UK in Corby and later in the US. These only saw moderate success due to their own reliability problems, the rather steep price tags and weight - the dawn of the lightweight amp was upon us. Today, the Trace Elliot brand still exists and the ELF is one of the smallest, lightest amplifiers on the market and according to many online reviews is solid, reliable and capable of holding it's own at gigs although the question of whether it truly sounds like the amps of old is still somewhat divisive. I can't comment as I've not tried one yet - I've only ever seen one example in the real world.

50551796361_a10a0cca22_h.jpgSmx art biyang by VTypeV4, on Flickr


The SMX has an array of knobs, sliders and buttons across the front panel which on initial inspection seem a little cluttered and complex. A closer second look will make more sense of things with each stage having it's own section. Initial input on the far left has a single jack socket with an active / passive switch plus there's the usual input gain knob although the input level is metered by a 'traffic light' system for optimum gain. Allied to this, there's a blend control for both transistor and valve stages, each giving a different 'flavour' or a balance of both. Next are the tonal adjustments with two switchable pre-shapes and the switchable 12-band graphic EQ with an independent level control - the status of both are indicated with LEDs next to each switch. Towards the right, there's the 'Sound management' section which, at it's centre has the EQ balance and this acts as a highpass / lowpass filter when turned clockwise / anti clockwise respectively. Flanked either side of the balance control are separate controls for the low band (left) and high band (right) compressors each of which has a different envelope suited for each frequency band. The knobs act as a threshold (and possibly a subtle increase in ratio - difficult to say) control with maximum compression obtained with the controls fully clockwise. Finally, on the far left, an output level adjusts playing volume and unbalanced line out connection levels, a standy switch works as a handy mute / tune plus there's an effects level blend for the FX loop. As a bonus on the non-rackmount 400w and 600w models, a UV strip light illuminates the control panel so even on effectively black stages, the status of all controls are easily seen.

The rear panel is different on each version.

AH300-SMX: 250 / 300w model is a compact 2u chassis and only has a single DI out (XLR) and a single, mono FX loop. Early 250 models came with a convection-cooled output stage but later 280w 'Bi-Polar Bear' stages were fan cooled. Very late models were fitted with the 320w Clive Button output board after reliability problems became an issue.

AH400-SMX: 350 / 400w model is a larger 3u chassis, has two FX loops (one parallel, stereo and high passed; the other series, mono and full range), 3 DI out (two post EQ, one pre) plus a dual mono line out. I can't find any reference regarding differences between the 350w and 400w versions other than their cosmetics.

AH600-SMX: 300w + 300w with the rest as above but with additional switching for mono full range, stereo full range or bi-amp operation plus an adjustable crossover with level controls on each power amplifier section. These were unchanged other than cosmetically.

Stand alone SMX pre-amp: As AH400-SMX but in smaller 2u chassis with adjustable crossover and high pass / low pass line outputs.

Specification: AH400-SMX

  • Hybrid pre-amp & SS output stage
  • 400w at 4 ohm, 300w at 8 ohm
  • Traditional class A/B topology - heavy iron and big capacitors
  • 12-band graphic equalizer
  • Switchable pre-shaped EQ curves
  • Active & passive input
  • Master volume
  • Dual band compressor
  • Series and parallel effects loops
  • Pre and post EQ direct outputs (XLR)
  • Post master volume line outs (Jack)

All references forward from here will be specific to the 400SMX.

50551062888_a3da8ac908_h.jpgSmx art biyang by VTypeV4, on Flickr

Sound Quality:

The baked in Trace Elliot sound isn't suited to all tastes, generes and sonic spaces - pre-shape one (general scoop centered at 400hz with slight boosts at 50hz and 2K5) is very '80s and quite harsh - number two is similar but less extreme. This is the usual association with these amps however, they are far more than a one-trick pony - the graphic EQ can be switched in to make some far more useful and real world sounds. Personally I use a combination of shape one and further adjust the sound with graphic for a smooth, more modern sound. With such an array of options and combination, I expect pretty much any sound could be coaxed from punk and rock through to jazz and funk - I've never struggled to get a sound I like.

The only potential downfall that could be leveled at the SMX is the lack of overdrive facility but that's not what these amps are about - powerful, clean and loud is where it's at - much like the SWR range albeit a different character. I'm sure a Sansamp before the amp could easily dirt things up if that was your thing.

Now to the jewel in the crown of the SMX; that dual band compressor. In studios, multi-band compression is common place and can be very useful in shaping a sound whether that be individual channels as part of a mix or a piece in the puzzle of mastering but is rarely seen on instrument amplification. Trace Elliot saw it fit do adorn the SMX with a dual band compressor so frequencies below 250hz will be treated differently than those above. Judging by ear (so this might be less than absolute fact) the low band has a slow (ish) attack and release and a soft knee which adds a 'solid' feel to each note. Note definition is helped and it gives you something to 'lean' against when digging in. The high-band feels to be a much faster envelope so personally, I use only a little of this as too much seems to kill the note and it starts feel like the dynamics have been all but ironed out. Whilst I'm used to comprehensive compressors, the simple two-knob design of the SMX works just as well in both live and studio situations - I feel like a lot of adjustments and tweaking were done at the design stage to get it right.

Given how flexible and tweakable the pre-amp is, it's very difficult to define but in terms of quality, it sounds great . I feel the Trace Elliot with it's extensive options will either help you shine and get you exactly where you want to go or it will hang you out to dry. To get the best out of it, knowing your frequencies and how they sonically 'fit' on the graphic EQ is a massive help plus listening and feeling for the appropriate levels of compression is also key - I always compare EQ and compression to booze; some can be good so more might be better unless it becomes too much - it can be a tricky balance sometimes. Taking the time and really getting to know it is the solution as they aren't really a 'plug and play' amplifier.

The single 400 watt output stage is very capable and definitely worthy of it's rating - at the time of writing, amplifiers of three times the claimed power are common place - many which weigh half (or less!) than the old Trace. Personally, I've never needed it 'full tilt' and at rehearsal it barely sits above idle. Despite it's 'modest' rating, make no mistake, this thing is 'proper', capable of rolling with the loudest of situations and finding the limits of most speaker enclosures!

50551062463_448a915563_h.jpgSmx art biyang by VTypeV4, on Flickr

Build quality and reliability:

In terms of build, I can't really criticize it on any level. On the outside, the green 'rat furr' (as many call it?) is bobble free and accurately upholstered, the riveted stainless steel corners are precisely fitted and the flip handles are highly over-spec'd. Looking to the front control panel, the black and bright green contrast each other very well with the writing having a very clean and defined edge - even with the UV light off. All the sliders, control knobs, switches and sockets have a 'solid feel' with just the right amount of damping to feel neither cheap or stiff.

On the inside, the story is much the same, most notably the power supply and caps. The transformer is a huge torroidal type which is no doubt where a good percentage of the amplifiers' weight lies - I've seen smaller in higher rated pro spec power amplifiers. Nestled between the transformer and the output board are the two equally over specified filter capacitors. A large (not too noisy, thankfully) fan is mounted on the left side in the centre to cool the internals. It's fair to say Trace Elliot went 'belt and braces' with the supply and output stage of these amps as they're far more impressive looking than their smaller 280w stable mates despite only a moderate claimed power difference. Looking elsewhere inside sees thick, good quality PCBs with a few smaller individual boards accompanying the main three, reasonably tidy wiring all housed in a thick steel chassis. No complaints here.

To be clear, this is the second 400SMX I've owned - I foolishly sold the last one in 2006. I've never had an ounce of bother with either example (or indeed the 600 I owned for a while) not even so much as a fuse. 100% trouble free. Unlike the all-valve amplifiers that I own, the SMX doesn't have any quirks or oddities (they all do that, sir!) and whilst this arguably strips it of a degree character, it goes hand in hand with it's truly professional design. This particular example was made in 1998 and have little doubt saying it works just as well today as it did when it came out of the factory.

Other observations:

It's very difficult for me to accept that production of these things ceased more than twenty years ago - they were the pinnacle of design and something that 15 year old me aspired to one day own along with a Warwick bass. As mentioned on this forum - often at great length, many times over - the world has since moved on and modern amplifiers are now smaller, weigh less; are more capable than ever plus their accompanying speaker cabinets are made from lighter woods plus the drivers contained within can play louder and lower with less distortion than those of even 10 years ago. Mauling 120 Kg worth of heavyweights is now optional!

Whilst we're talking of weight, the big SMX weighs something in the region of 24 Kg (we're into valve amp territory here) which is just out of the question for those suffering with frailty or other physical ailments - a modern day ELF weighs less than one kilogram and even something like a Genz Benz Streamliner 900 weighs less than 4 Kilos. Despite of all that weight and physical bulk, the performance is unquestionable and is still more than capable of holding it's own against anything modern (once you've EQ'd the '80s out!) - irrespective of claimed power.

50551062093_63dc65a92d_h.jpgSmx art biyang by VTypeV4, on Flickr



  • Like 9
  • Thanks 1
Link to comment
Share on other sites

37 minutes ago, gafbass02 said:

Loved reading this. I desperately miss my old ah400smx. I used one with two 4x10s and a bright box when I was playing some big venues in the mid 00s. Brilliant rig and I long to own one again. 
great bit of writing. Thanks :) 

Thanks, I'd honestly forgotten how they were. 

Link to comment
Share on other sites

2 hours ago, Lozz196 said:

Great review

Thanks, Lozz.. 🤗

1 hour ago, stu_g said:

I have an AH300SMX that I have owned from new I really need to get it fixed.

I had a 300 about twenty years ago - it sounded great but suffered from a few dry joints on the infamous 'bi polar bear' power stage. Hope you get it fixed, I'm sure you'll love it all over again. 😎

  • Like 1
Link to comment
Share on other sites

50562686423_a0d86ebcaa_h.jpgSmx 400  inside by VTypeV4, on Flickr

50563563512_c4f7f6e36a_h.jpgSmx 400  inside by VTypeV4, on Flickr

50563427646_7773b43f53_h.jpgSmx 400  inside by VTypeV4, on Flickr

50562685848_3c1d3f5b57_h.jpgSmx 400  inside by VTypeV4, on Flickr

I thought I'd best pull it apart just in case it was caked in dust but thankfully, it was very clean so I simply gave it a few squirts of contact cleaner before buttoning it back together. The valve appears to be original as it's got 'Trace Elliot' printed on the side but it works fine with no distortion or difference in gain so I've left it in. 😎

  • Like 4
Link to comment
Share on other sites

Thanks to everyone for their kind comments regarding this review - it's appreciated and very humbling. It's a lovely community here on Basschat. 😎

As for Trace Elliot gear, my journey started with a little Boxer 30 back in 1998 and it was a stonking little amp! I remember carrying it to school on a couple of occasions and it running rings round the nasty 'Syncron Bass' amplifier that was there at the time. Fast forward 18 months or so and my first 'proper' amp was a 712SMC which continued the now 22 year love affair for all things TE.. 💚

Link to comment
Share on other sites

  • 4 months later...

Just came across this as I searched for some info on the FX loop on the 90's SMX ( there's a combo for sale & I wondered was it parallel or series).

I had a 400 too back in the late 90's, early 2000's. Really enjoyed the write up.

I too was that lad, having seen Deacon Blue Live, that wished for a Warwick & a Trace Stack! ... great write up, really enjoyed it. Thanks

Edited by WarwickRoss
  • Like 1
Link to comment
Share on other sites

  • 2 weeks later...
  • 1 month later...
17 hours ago, hemdee666 said:

Hi, just got a RAH400SMX wednesday. Hope I enjoy it as much as I enjoyed reading your article. Very well done sir. Grtz, Marc. 

Many thanks - I'm sure once you get into it, you'll love it.. 😎

  • Like 1
Link to comment
Share on other sites

Great Review - i needed this 15 years ago! 

I have this exact Amp and I too have preshape 1 on and use the EQ to help the sound a bit. I have just joined and 80's band - so maybe I should "un EQ the 80's in" 😄

I have learned a couple of things this reading this esp with the compression - I am going to try your setting with a lower setting in on the high compression - Thank you.

I owned mine since 2002 and it has never let me down with 18 years of gigging regulalry with the last 6 years using a Warwick $$ - I did have to give it a hover out about 12 years go - maybe i should open it up! 

Solid amp sitting on a 4x10 and 1x15 cab - although I sold the 4x10 cab recently to save my back/space... hoping I havent doen the wrong thing!

TE with Warwick.jpg

  • Like 2
Link to comment
Share on other sites

27 minutes ago, lukewarm said:

 I have just joined and 80's band - so maybe I should "un EQ the 80's in" 😄

Brilliant - try it and see! It never did Mark King any harm.. 🤣

Thanks for the kind words and I'm glad you're still getting great service from the rig. I wouldn't worry about selling the 4x10 as that 400w power stage (as I'm sure you're already aware) is more than capable of driving pretty much anything.. I still need to try the SMX through my SWR boxes as they're fantastic with the V4..

Glad you enjoyed the review. 😎

  • Thanks 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Create New...