Recent content by Kees de Visser

Right, the Genelec 1035 I've worked with is about 142kg for the speaker and 71kg for the amp. The amp has active ventilation which is rather noisy, so has to be hidden in a sound proof closet. I've recently bought a modest PA system for my digital piano, including a power amp with DSP and noisy...

IME the DAC/ADC chain should be quite transparent. After all it's the de-facto setup for out-of-the-box mastering with analogue outboard gear. Would it be possible to provide two test files (the original and one of your loop-back files) ? I'd love to listen and see why the null is only -42dB :)

42dB seems a suspiciously high value to me. Are you sure that the levels are identical, both signals optimally aligned and that there's no drift (sample rate difference)?

Bummer. So it won't work with higher frequencies? 1000ft/2=500 so 20kHz *500=10MHz. Anyone tried this?

Does cable burn in at the factory of say 1000 ft on a reel take as long as a 2 ft consumer product ?

I got that article by email yesterday and wondered if this forum might be able to share a few thoughts about the test setup (in a separate thread?). Mark Waldrep acknowledges that there will always be criticism on the test, but agreeing in advance about the setup might reduce that to a minimum...

I know Keith, thanks. I just wanted to point out that dsp also has to compromise, depending on the application requirements (low latency in my case). It might still be the preferred solution over all analogue though.

In some applications, especially live music amplification, latency (by DSP processing) can be an issue. The Kii monitors in our studio e.g. have a high latency mode (±90ms) which claims better performance, but is unusable when used with video or other live sources.

Well, without an amp they are lighter :) Recently I decided to pick up playing piano on chamber music concerts so had to find a good PA system for my digital piano (easier to transport than a real grand). A good friend who is a PA pro gave advice and his first choice was Nexo, a set of passive...

Correct. I only cared about the HF performance and started the sweep at 300Hz.

IMO the built in mics of the Zoom models are not of the highest standard. I have a Zoom H6 with 4 ext. mic inputs (with 48V phantom) which is very handy and flexible. Frequency response is quite accurate, more than sufficient for acoustic measurements (with a high-quality mic). Here's a sine...

I usually make them quickly with iZotope RX, so it's easy to make any notch(es) you prefer. Any suggestions ?

I've thought about that too, but it probably requires small (miniature?) microphones with inherent higher self noise levels. It also involves making a dyi coupler, something like a wooden plank with a hole. The question remains, if I can't measure distortion products in a deadly silent (24 bit...

That's interesting. I've DIY'd a similar test myself, not knowing it existed already, to test IMD differences between hi-res and redbook audio. I created an audio file with alternating hi-res/lo-res and made several versions with different notches. The files were played back over speakers and...

I've done hundreds of null tests (in the digital domain) and found the difference signal between the hires and (properly SRC'd) redbook signals to be below -130dBFS. It is indeed very hard to imagine that this difference is audible.