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  1. Thanks again. I have an Mscaler dual-feeding a Qtest but don't think it sounds quite as good as my i7 PC feeding my DEQX processor directly with the 176-24 files using 6.4M taps. I don’t really understand the intricacies of upsampling but will try the trial version of HQplayer to experiment again - it certainly would be quicker/easier than individually upsampling tracks. I do know from 15 or more years of using DEQX that any subsequent DSP processing is a black art in determining the best filters. Even for room correction there are difficult choices to be made about where and how much EQ correction should be made. But that pales in comparison to the choices for digital Xovers and driver correction used for active speakers such as my isobaric 3-way. The latter filters also depend critically on the positioning of the test measurement microphone - for which there seems no definitive guidelines and partly luck!
  2. Many thanks for your extended reply. Which other filters do you prefer and why ie what other parameters are more important to you?
  3. Have you tried it for sound quality? When I trialled the 1 million tap version about a year ago my laptop struggled and in any case I was underwhelmed by the SQ. One wonders whether they have improved the efficiency of their calculations or just the required computing power? I could not quickly see any details on there website including what computer power was needed. Over the past few months (amongst the trials & tribulations of selling & buying a house) I have been using a Windows-based sox upsampling program kindly supplied by @krebetman with 6.4M taps. It upsamples a 3 min 44/16 CD track to 176/24 in about 1 min with an i7 3.4 Mhz PC. At the moment I have to transfer each ripped file into the folder containing the sox program and run it through Windows cmd so it is a bit clunky but it did save me having to upgrade very old computer skills – and I prefer quality over quantity! I find this 176 6.4M upsampling produces a very useful improvement in sound quality when fed to a DEQX HDP4 preamp processor that does the DSP of xovers and driver correction as well as room correction for my 3-way speakers. And since the DEQX has a maximum input rate of 176/192 there is no point in upsampling further even though higher rates did produce marginal improvements with samples kindly from @Ittaku into my Chord Qutest DAC as perhaps expected by theory. The improvements in SQ from this 176 6.4M upsampling were of the same order of magnitude as those caused by changes to DSP xovers & driver correction and room correction due to test microphone positioning as well as choices of xover frequencies and slopes – all of which have to be determined by a mixture of science and black art and luck! Fortunately the planets have been aligned and my music reproduction is now as good as I have heard it.
  4. I was also very saddened to hear from Paul at CAV of Brett's passing. He could be prickly at times but was a good guy who also loved music & hi-fi and was very knowledgeable of both. These Legend speakers were my first prototypes of our Big Reds that Brett kindly agreed to evaluate - and he liked them so much I never got them back! In fact Brett was in many ways their inspiration after he told me that Legend's Kantus had been used in the development of the Matrix film soundtrack but they would have liked more bass. So I took a pair of our then Kantu and added a Peerless 10" XLS subwoofer on its side and a 350W sub amp on its back, Finally its 6.5" Audax aerogel driver was replaced by a 5.5" one more suited to its midrange duties - hence all the blutak to seal it. I think the tweeter is a Morel but am not sure. Hope this is some help for selling but I have no idea what they are worth now.
  5. I forgot to mention 2 other caveats! Firstly the overall gain of the Qutest + amp needs to be large enough to drive the output voltage of the amp (and so the input voltage to the speaker) so that they are loud enough for your needs. Some amps have lower gains than others - hence Qutest compensates by providing more gain options. But as Sime has pointed out it can lead to overload of the amp. The other caveat is that by requiring one of the devices to give more gain it may increase that devices noise output and so hum or hiss of the overall system - but again this seems unlikely to be a major problem in Rowan's case.
  6. It should not make any difference! The overall loudness of your speakers is determined just by the (signal) voltage at their inputs ie the voltage at the amplifier output. In the context of your question this voltage will be determined by the gain of the Qutest x gain of the amplifier. If you increase the gain of Qutest (by increasing its output voltage) then as you have found you have to decrease the gain of the amplifier (on its volume control) by the same amount to compensate to give the same overall gain and the same loudness of your speakers, The only caveat would be if one or other of the devices had distortion that varies greatly with gain which would cause a change in sound character – or if you overloaded the input or output voltage in one of the devices so it 'clips' and causes gross distortion - but this is unlikely in your case.
  7. For what it worth (and for some probably not much!) the Chord TT2/MScaler combination has just been given the DAC of the Year Award by The Absolute Sound magazine: Chord Electronics Hugo TT 2/Hugo M Scaler $5795/$4995 The visionary digital design consultant Rob Watts develops most Chord Electronic DACs. Typically, Watts’ DAC designs include elaborate FPGAbased, long-tap-length digital filters running proprietary WTA (Watts Transient Aligned) filter algorithms. Here’s why this matters: Watts has long claimed that standard-res (16-bit/44.1kHz) audio files could, if processed through a digital filter of near infinite tap-length, yield analog waveforms as accurate as those produced from high-res files, albeit with slightly higher noise floors. It is the claim that Chord’s Hugo TT 2 DAC/preamp and M Scaler aim to prove. The powerful, quiet Hugo TT 2 features a sophisticated DAC that supports PCM to 786kHz rates and DSD to DSD512. Hugo TT 2’s digital filter offers an impressive 98,304 taps and sounds very fine in its own right. However, adding the M Scaler further elevates performance by upscaling incoming digital files to 705.6kHz or 768kHz levels, then processing them through an FPGA-based filter offering 1,015,808 taps and running an enhanced WTA algorithm. The end result truly represents a new way forward in digital audio—one where standard 16/44 material in every way sounds as good as (or better than) even the highest-resolution files. A technical and musical triumph, and our DAC of the Year Award winner. THE END RESULT TRULY REPRESENTS A NEW WAY FORWARD IN DIGITAL AUDIO.
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