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No reason why they shouldn't work. Remember that you need to be at least a couple of meters away from the diffuser to get to the benefit.

The combined response of the sub's that is predicted by MSO should closely match the measured response with the filters in place. If it doesn't, then something went wrong transferring the filter parameters to the DSP. Or you didn't use an acoustic timing reference when you took the measurements...

Here is the impedance sweep for the drivers in their new cabinet. At first, I ran out of stuffing, so the cabinet was only lined. The resulting value of Qt was disappointing at 0.82 (Fs 45.5Hz) compared to my target of 0.707 When 750g of polyester stuffing was added, the Qt improved...

Done! The plate amp is mounted on the side for purely aesthetic reasons...I didn't want to be able to see it from where I sit. Here's a size comparison... In the center is a (standard) SVS PB-1000 subwoofer. On the left is the passive M&K MX-5100 that I built and detailed here. On the right...

"Not Going Out" with Lee Mack

Thanks! Here's hoping it was worth the effort.

So this is what has occupied my spare time for the last three weeks. Construction of the upgraded SA-WX900 cabinet... Staring point, with the plate amp removed. The bottom driver is pushed up into the small, chipboard cabinet that has no bracing or stuffing. Add ribs to the existing cabinet...

The worst thing is when someone says that "it sounds okay" Just "okay"? WTF!

Just saw these...and you'll save some cash by buying used! https://tmraudio.com/kii-audio-bxt-powered-floorstanding-speakers--graphite-pair--kii-controller/ https://www.kiiaudio.com/bxt.php

Assuming that you have the practical woodworking skills and tools, IMHO it is relatively easy to build a sealed subwoofer that exeeds the performance of what is commercially available at any price. Why? Because you have the opportunity to over-build a (large) cabinet to such an extent that it...

Quite a few DSP options on AliExpress, for example... US $192.06 ShennDare ai408 4 Input 8 Output 32-bit DSP Digital Audio Processor Professional Speaker Management System Audio Processor https://a.aliexpress.com/_mMUJity

Nice work!

No idea, but I wouldn't be surprised. I couldn't find any information on this PSU online. In the SA-WX900 service manual it is referenced as a "black box" in the circuit diagrams.

Here are the planned modifications to the cabinet to increase stiffness and the dimensional volume. From the TS parameters the ideal sealed cabinet (Qt = 0.707) for two of these drivers should be about 107L. The current volume is probably half that, so the plan is to move the electronics to a...

I watched a movie and had to reduce the boost setting to zero in Movie mode! 75dB at the MLP only requires the volume setting on the amp to be at 25%. I haven't done the full MSO calibration on this sub yet. It is simply connected to the second sub output of my AVP with Audyssey XT32 handling...

Mod #1: Install 4 x 5cm castors wheels. Total cost 14NZD The SA-WX900 weighs 48kg and takes two people to lift safely. Adding wheels makes it so much easier for one person to move it around. I find it hard to believe that Sony supplied spikes with this sub!

Here is how the various filter settings affect the frequency response. The cutoff frequency control is set to 200Hz (max). There are two modes - "Music" and "Movie" and three levels of "Boost" (0, 1, 2) For some reason the Music mode adds a shelf at around 20Hz. Music Mode with boost levels...

The previous owner bought it new. I assumed that was in NZ, but who knows...

I like push-pull subs, but I was unaware that Sony had made any, until I noticed one for sale on a local auction site. In fact Sony has made two models that I know of. A dual 10" 250W sub (SA-WX700) and the one that I found, which is a dual 12" sub with a 1000W B&O IcePower 1000A amplifier...

Large, linear power transformers are often audible at mains frequency, humming away at 50/60Hz. SMPS are silent in comparison because they are switching at hundreds of kilohertz. I am referring to mechanical noise here, not anything that you hear at the loudspeaker.