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Rear with back panel kit fitted (kit not included)

Deluxe 4U

$ 370.00
Size4U 165mm (H) x 440mm (W) x 300mm (D)
Front Panel10mm Silver (8 pre-tapped M3 threads, 1 LED pilot hole)

The Deluxe Chassis is the ultimate DIY Amplifier playground.  We don't know of another chassis for sale in the world that makes life as easy for DIY Audio enthusiasts.  Packed with features so you can focus on having a good time building your amp instead of getting roadblocked by the hardest parts of custom machining.

Introducing the 4U "Jack of all Chassis"...



  • 1 x aluminum faceplate 10mm thick, 450mm wide with rounded corners and anodized in silver
  • The standard front panels do not have any holes drilled in the rear
  • Both silver and black faceplates (as of October 2023) have the following modifications:
    • 9 blind M3 pre-tapped mounting holes suitable for mounting all kinds of things to the faceplate - diodes, PCBs, riser panels, potentiometers, etc
    • Mount single or dual PSU boards directly to the back of the front panel
    • Designed so risers can be bolted to the chassis using two axis to create stable interior platforms within the chassis and maximize all the interior space 
    • Use with risers and easily mount front panel components such as pots and dials to the risers with extension rods going through the front panel, saving the need for complicated or messy hacking in order to attach things to the front panel 
    • The 9th hole is perfectly centered in the chassis and approximately 1/3 of the way down from the top (or bottom - you can spin the front 180') and can be used either as a mounting hole or as LED pilot hole

Back Panel

  • 1 x aluminum back panel 3mm thick and CNC routed to our back panel specification, ready to accept your choice of PEM, RCAs and premium binding posts or drop our back panel parts kit (not included) straight in
  • It has Neutrik XLR compatible holes on the back to accept XLR, XLR/1/4" combo or RCA-in-XLR-format connector so you can easily connect XLR, 1/4" or RCA cables to your amplifier
  • Please see the 4U Back Panel Specification for more details


  • 2 x aluminum top/bottom covers, maximally vented with 6 rows of venting strips, to provide an ideal balance between airflow and stiffness


  • 1 x galvanized steel, perforated inner baseplate 300mm deep and 1.5mm thick which is pre-drilled with a pattern of holes allowing for easy mounting as well as less flex
  • All holes in the base are in a DIY friendly 10mm x 10mm hole pattern.  This makes it easy to design the mounting for anything you might want to attach, as well as ensuring if you rotate it 90 degrees, it will also mount perfectly.
  • Holes are aligned so there is a column of holes directly in the center to make it easy to drill out a hole for perfectly centered transformer mounting
  • All diyAudio PCBs going forward will come with mounting holes spaced apart in multiples of 10mm to allow for easy mounting in any orientation
  • Riser Panels can be combined with the 10x10 pattern to create unlimited horizontal and vertical mounting configurations

Riser Panel Compatible

  • We've created riser panels that can be bolted to the base, front panel or each other to create unlimited possibilities for the maximisation of the internal space within the chassis.  
  • Want to stick burning amp output boards, bias boards, gain stage, dual psus, dual transformers, soft start and speaker protector all in a 4U chassis? Walls and shelves now simply screw together in any configuration to dramatically increase your ability to optimize the internal space.

Ideal for:


Build Guide - HERE



Height (mm) Width (mm) Depth (mm)
One 4U 300mm Heatsink per side, drilled and tapped to UMS specification
Side panels
3mm black anodized aluminium
3mm black anodized aluminium
Front Panel
10mm anodized aluminum (8 pre-tapped M3 threads & 1 LED pilot hole)
Rear Panel
3mm black anodized aluminium
  Dimension diagram

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Deluxe 4U

$ 370.00 USD

Customer Reviews

Based on 50 reviews
Mike R.
Built Monoblock Aleph 2's

I built monoblock Aleph 2's with this chassis using the Aleph UMS boards available on Etsy. The case works great for that application. The chassis can dissipate a good amount of heat and is pretty big for the price. I have used the 4U, and these 5U cases as well as Aliexpress cases. They all have their merits. The Aliexpress cases that I have used have fancier machine work (as a stock option) but the anodizing isn't as tough. Also, you have to do a lot of work drilling holes etc. These 5U cases, you just put them together and bolt your boards in. The only drilling that is needed with these is to bore out the hole for whatever transformer you are using. Otherwise, just go to town and get your amp going. :)

I built these Aleph 2's for a friend who opted to have the fronts machined which was very nice. There was a lot of back and forth with the chassis manufacturer and my friend to settle on a design.

It would be good to have a general instruction video for a new builder. Other than that, everything is pretty good.

4u delux chassis

Yes they are expensive but the look and time saved over fabricating a chassis was well worth the money.
Get the delux and the associated hardware kit. My f5 amplifier was a perfect fit.
Ill be back to repeat my order for the f6

4U Deluxe for a F6 Amp

Arrived timely. Easy to assemble but a few instructions would help. Had to drill holes to mount the provided feet. Heavy and nice quality materials. I thought there would be a LED hole but you have to drill it out which I probably will not do for concern to damage the face. Lots of mounting options. Overall very satisfied.

Looks Great

I purchased two of these. They both look great. The build quality is exceptional. It was a little finicky to put the first chassis together, but the second one was pretty easy as I knew what I was doing.

Note that the back panel comes pre-cut for the DIYAS chassis kit.

Tony M.
4U Deluxe F5 plus handles

Chassis was a little expensive but if your doing an F5 you probably don't want to go smaller. Assembly was easy and the chassis look great and it's pretty much made for the Diyaudio boards. Rear panel has no center support and while it seams thick enough pushing on it too hard while inserting a power cord will bow it in so think about adding a brace. The predrilled front panel made mounting the handles easy. When assembled one of the handle bars was loose and the other fine so it may need a little shimming. That said I'm actually pretty happy with the chassis and would purchase again. Chassis arrived in California in 5 or 6 days.

Rich H.
Great chassis and easy to build

I built the Pass DIY Sony VFET amp kit with this chassis and it turned out very nicely with drilling countersunk holes for the faceplate mounting screws and the two LEDs.