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Alan has a huge amount of experience so it is hard to better his efforts. However I know from working with him over the years even he sometimes gets better results (from subjective listening) that we cannot explain or generalise.

No matter how you do the measurements the sound quality will be "very good" - this in inherent in the DEQX hardware & software. I think it is more a question of what are the "best" measurements to which in my experience there seems no clear cut answer and must be determined by trying.

Hi, I have been using DEQX preamp/processors for about 20 years, including as the basis for the "Ultimate" range of Legend Acoustics's loudspeakers, most recently with their HDP4 (though unfortunately not the current pre-4 or pre-8) and during that time have tried a number of different...

PS Forgot to mention that there are now no loud "bangs" when turning the PS on or off nor when changing music tracks - so it all seems due to an earthing/ground misunderstanding!

Many thanks for all the info. I have taken a lead to the -ve output of the SMPS from the earth ground that forms a star ground for the system. I hope you can see this in the attached photo. The SMPS has mains L-N-E inputs on the far left (that come from a fused switched mains socket at the...

Thanks. I found the SMPS 0 /-ve output was not connected to earth so temporarily made this connection and the gross hum disappeared. To do it permanently I had to disconnect quite a lot of connections such as speaker output wires that I had kept short so tomorrow moring Oz time I will reconnect...

Thanks for the 2 replies above. I suspect that I have not connected the negative side of the power supply to earth may be the problem - I assumed that this would have been done internally in the SMPS. In previous amps where I have used linear PS the centre 0 of the + and - were always connected...

Without any source input I get no bang and the amp is very quite through my speakers. However I now get a very loud hum when I connect a source, a DEQX processor/preamp that I use for my 3-way active speakers. It may be better to try and resolve these problems by private communications via...

I could find no evidence of ground loops eg hum etc. However a strange thing has occurred. Now that the stereo amp module is no longer in the system, having been returned with refund to 3e Audio via AliExpress, the "bang" problem has disappeared from the remaining mono amp modules. So perhaps...

Thanks, I will investigate the ground issue further and advise.

I am using balanced XLR connections between the amp and the DEQX HDP4 preamp/processor. I will see if I can find a solution on diyaudio thanks but it may be difficult/messy to implement with the 5 modules in the 6-channel amp. I would have thought it would be implemented by 3e Audio as part of...

Thanks. Yes I originally tried it without the huge capacitor banks (which I have used in the past to improve bass performance) but it had no effect on the huge "hang" problem on turn-on or changing tracks.

I have recently built a 6-channel amp for use with DEQX active speakers, Legend's Tikandi Be mk3. They use 3e Audio's amp modules, one stereo 260-2-29A module (shown on the LHS of the attached photo) and four mono 480-1-29A modules (RHS of photo). Between them is a 1200W SMPS with 80,000+...

Yes Keith the system at the show was Alan's personal one but no the speakers were definitely not "DIY" as can be readily seen by comparing your photo of Kim 's demo with the one of the ISRs that I posted. It was decided not to emphasise the origin of the speakers for a number of reasons. One was...

I forgot to mention that the speakers DEQX were using for their Melbourne show demo were actually Legend's Isobaric Small Reds (ISRs) http://www.legendspeakers.com.au/products-small-reds/

Some semi-random thoughts from someone who has been using DEQX commercially for nearly 20 years in designing active speakers http://www.legendspeakers.com.au/ultimate_active/ I first became intersted in speaker DSP when working for Linn in Glasgow in the late 1980s designing their new range of...

Sorry no it was well after my time there but perhaps Ivor was worried about his reputation :rolleyes:

Yes the Keltik was a somewhat controversial speaker at least partly because it required good understanding and setting up to achieve its best results. As one person said it was too far ahead of its time. I have heard recently that some people have been upgrading it to the "Killer Keltik" with...

Rounded edges are always better but they have to be quite large (much more than the normal 10 or so mm radius) to have much effect. Essentially waves only see/are affected by objects larger than about a fifth of their wavelength (a very rough rule of thumb),

Yes 4-way digital active is the way to go. I did it over 10 years ago with Legend's Tikandi Grande loudspeaker that has many similarities with the Linn 360 though I used a triangular front baffle rather than large radii to minimise edge effects...