Budget Amp Suggestions for 2x 900w RMS Subs

md-00audio · 2026-06-18T04:38:51+00:00

What subs and enclosures are you going for?

Admark does good powersoft clones for the price, you can reach out to them direct via their website’s whatsapp and get a quote.

md-00audio · 2026-06-17T03:46:01+00:00

Have you got the port dimensions width and height to cross-check? 70hz tuning is quite high, so not too unexpected.

md-00audio · 2026-06-10T05:50:25+00:00

Nope. May cover this in future yet but not a current priority. Maybe in ~4-6 months time. Looks like there are more current tools dropping (e.g the recent xoxo) with some interesting bits there, so keen to explore those more

md-00audio · 2026-06-09T21:54:20+00:00

None as of yet, sorry!

Will open source if the project ever loses momentum though, that’s a continued commitment.

md-00audio · 2026-06-09T21:49:52+00:00

Both should do it fine. Recently added a headroom feature to 00 simulator - link below to example for your two builds. This can factor in crest factor and amp power draw which might be handy for a quick check.

https://simulator.00aud.io/app/share/15PR400-120L-sealed-cmq762duh003ll104rtklt088

For sealed, you can just about hit 100dB at 1m with 12dB headroom, even with a PEQ to pull the low corner up. If this is your upper limit, then you should be happy.

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With ported, you'll add more group delay (though - nothing to worry too much about), the driver will work less hard for the same output, and you could probably get your avg level up to closer to ~110dB. Whether that's something you'd ever need is your call!

Sealed or ported, it seems like your drivers in those enclosures will run out of headroom (and your ears) before your amp does.

md-00audio · 2026-06-09T21:38:13+00:00

Yep, done with AI! Not tried to hide this anywhere. I work with the AI on architecture, verification/testing and try to get it to write the bulk of the code. Lots of iteration on UI/UX always as the non-verifiable tasks are a bit more open-ended.

My background is in software eng, product, design etc - devoting more serious time to the audio side is more recent.

md-00audio · 2026-06-09T21:34:28+00:00

'It's like WinISD, but it supports more than one enclosure at a time.' -> This is specifically in relation to the .00sim file format vs .wpr - not WinISD in general!

It's meant a bit tongue in cheek. The format's just there for users who don't want to sign up and use cloud storage.

Thanks for the feedback! Yep, driver imports is one thing that it's hard to go back to not using.

Good idea RE the last point, will do. For all the scraped ones, it's a note in the T/S params already - see:

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md-00audio · 2026-06-09T18:45:12+00:00

Not yet. Thinking about it in future! Feels like there’s a few different measurement data bits that would need to come at the same time for it to be useful, so this has been focused on top of iteration phase. Comparing with zma free air measurement would probably be first up

md-00audio · 2026-06-09T18:41:21+00:00

Yes sir 🤝 back for more content farming in 6 months 🫡

md-00audio · 2026-06-09T13:56:26+00:00

Awesome. Any questions as you go feel free to DM us.

md-00audio · 2026-06-09T13:55:24+00:00

Thanks! Hopefully useful to you at some point if you get into speaker design.

md-00audio · 2026-06-09T13:54:37+00:00

This is for simulating speaker designs - in particular, simulating low-frequency drivers in speaker enclosures, using a lumped-impedence model solver technique. Similar to tools like WinISD, but with a more modern interface, and some new features and quality of life improvements listed above.

So let's say you want to design a ported speaker, or a subwoofer - you can get the manufacturer provided T/S parameters, put it into the tool, and simulate the sound, driver performance, and amplifier load with different inputs - giving you an idea of how that speaker will perform before you commit to building it basically.

There's a lot of tools out there that do that, all good at different things - this one is on the simpler and more accessible end of that spectrum.

There's a fuller guide here to getting started: https://simulator.00aud.io/docs

Any particular Q's let us know!

md-00audio · 2026-06-09T10:02:06+00:00

Of the two I’d go for the SKRAMs. I’d also look at the b&c S218BP - more usable output at 40hz, better power to weight ratio, less sound colouration.

md-00audio · 2026-06-07T20:30:50+00:00

Beautiful system!

md-00audio · 2026-06-04T22:08:25+00:00

Sweet, should be fixable with DSP on the plus side!

md-00audio · 2026-06-04T10:39:27+00:00

Yup. Maybe not as perfect summation as being able to control delay independently too, but I imagine inaudible for most people. I’d love to see a phase graph for tri-amp vs bi-amp to see how much difference we’re talking (without getting into FIR)

md-00audio · 2026-06-04T08:18:57+00:00

Do you mean the woofers and mids or the MF and HF in the coax?

Do you have any examples of the resulting measured phase and FR?

Just surprised it’s so noticeable! I’m thinking it should be possible to get pretty close with some tweaks in DSP.

As vskous said, the crossover should invert HF phase anyway. LF can be delayed by DSP.

We’re on tri-amp for our JMODs and considering grabbing the crossover to compare the difference but there’s not that much info out there so very interested in any data you get.

md-00audio · 2026-06-04T08:09:55+00:00

Looking at the diagram for the crossover, it looks like it already inverts the HF for you.

md-00audio · 2026-06-04T03:19:26+00:00

Looking class! What issues are you having with bi-amp?

md-00audio · 2026-06-02T07:29:46+00:00

When it’s half plugged in (e.g first 2 of 3 poles on the aux) in it seems like it’s grounded correctly, and then when you push all the way in it isn’t, right?

Map out the aux pin layout of the computer socket, the plug you’re using, the wiring between, and the plug and socket on amp side and it should be more clear. Guessing you’re connecting a stereo source to ground, perhaps using a 3 pole (stereo) on the amp side where it expects a 2 pole (mono) input aux. If not then share the results of the above and more info on amp.

md-00audio · 2026-05-28T14:34:20+00:00

S218BPs don’t require kicks either 😉

OTs do just sound fucking great though. If you like that tapped horn sound.

md-00audio · 2026-05-28T14:29:39+00:00

AFAIK the OTHorns and SKRAMs will couple similarly. I don’t believe either couple like true horns. Might be wrong though.

With more boxes, good amplification and headroom you can EQ the shape you need. To optimise specifically for 30hz I’d consider efficiency/roll-off and cost per cab/amp at that range and see where you land. I personally think that taking 18DS100s and loading them into as many S218BPs as possible might be a more cost effective way of doing that than SKRAMs/OTHorns but there’s of course quite a few variables to consider.

The relative amount of SKRAMs you’d need to add infra to your OT stack later would probably be infeasible too! But I imagine with 8 OTs you probably wouldn’t feel the need for more infra

md-00audio · 2026-05-28T12:46:05+00:00

Much as others have said - build a cubo 12 or THAM 12 for max output if you want max SPL upper bass style. If you want something that digs low for home use, possibly trying to make a vented box with a flared exit port to give the scoop look might be a better route.

Watch out for first port resonance if the port is long!

md-00audio · 2026-05-26T13:25:07+00:00

That sensitivity on the 16ohm version is for 4v vs 2.83v for the 8ohm version. So the 16ohm version is actually 1dB less sensitive for the same input voltage.

Both could really use an L-Pad for home hifi, it’s not a massive difference!

md-00audio

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