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Multi-tone Distortion Testing - continued Guys; I'm building a 32 tone multi-tone test suite in the APx585. This will most closely simulate music program material. I need to run some tests to make sure its a good tactic before I implement it into our standard. Keep in mind however that if...

The frequency bins chosen do matter and there is a science to it. Just randomly combining a multi-tone test is not a good idea IMO. I do all of the amp measurements and I am currently working with my local University to train a PHD EE student over the summer to help do these for me. My tests...

Multi-tone Distortion Testing You have to be careful when doing multi-tone distortion tests. The tests referenced from Secrets don't appear to be done with much consistency (test frequencies are different, scales are different, etc). I am thinking about revamping our FFT test to incorporate...

You're more than welcome to start your own website. Invest in test equipment and solicit manufacturers to send you products so you can measure and report on them. I'm sure you can make this all a reality in no time. Then you can create a forum so others (myself included) can come on and...

You've "alerted" the readers at least 4-5 times in this thread about your opinions. This has gone beyond that for you now. I disagree with most of your arguments and feel you are using quotes of this article out of context to push your own agenda. In any event, I updated the article for...

I agree, I prefer locking connectors. I designed audio equipment for the military so I like to have things as rugged and secure as possible...hence why I love HDMI :) RE: Distortion I don't really see the need to do multi-tone testing like that, especially into a loudspeaker load. I do spot...

Yes I think that is a fair assessment. It was definitely not like the night/day difference I heard switching from the Pass Labs / Classe amps to the Axiom digital amp. I may have a friend over to do some quicker switching for me to see if I can give a more definitive answer. The Emos and...

yes you do need to model preamp, cable, and power amp to get a more accurate picture of what is happening. The point here however is cable capacitance is important and too much acts as a LPF. The article doesn't discuss characteristic impedance or TL effects. It does talk about low...

You are free to read my prior Receiver reviews that I bench tested the preamp outs. All of the info is readily available on this site. As for the cable impedance, I have actually measured this phenomenon when designing audio communication systems for the government. In order to meet their...

THX has become quite a watered down proposition IMO. Their certification for speakers/subs is pretty easy to pass. Our "Large" bassaholic rating far exceeds anything THX does, not to mention getting our Extreme rating. As for amp testing, that again is a pretty easy thing to pass for THX...

The same could be said about jumping to conclusions and making unsubstantiated claims in a forum post to discredit this article when you have no data to back it up. 1. I have measured MANY receiver preouts that clip at 1Vrms either b/c of the limitations of the Volume controls or b/c the...

I can't comment on the hifi review other than JJ uses the old Carver speakers which I can't imagine sounding neutral with any type of amplification. I am not 100% certain the XPA-1 and XPR-1 at lower power would sound equivalent since I never heard the XPA-1. I can tell you that the XPR-1 does...

Hmm I didn't realize that. I just wanted to do low level listening test comparisons to be honest. None of the amps would have been driven to their limits. I just can't rely on my memory when it takes me at least 1-2 minutes to switch out the connections each time since these amps all sound so...

My Status Acoustics 8T dip down to 2 ohms at bass and higher F. The Emos have no problems driving them. Almost no bridgeable amp will give you power #s down to 2 ohms. When doing a diff topology like that, each half of the amp sees 1/2 the load impedance so its unlikely it would double down...

If it's buzzing on its own with nothing connected but your speaker leads and power, then there is either something wrong with the amp or the ground in your outlet. Does the power meter stay illuminated the whole time as if there is something playing on it? Try a diff outlet connected from a...

I'm not sure but I'd imagine the design is very similar. It would be clearer if the idle power was listed but you can ask Emotiva.

Rich, yes this is definitely a clean amp at low power. I want to do an amp shootout but the company that makes the device I really want to make this a reality only has 2 prototypes; one of which they have in constant usage and the other Salk uses. BTW, I just added the following test and...

It will work but for liability, EMO recommends a 20A line since that is how it was certified through safety and regulatory. And yes, unless you are running full duty via test tones, you probably won't trip the breakers, though try playing Jienat Mira Blu-ray with your speakers set for fullrange...

disconnect all inputs to the amp and just connect power and speakers. If the buzz is gone, then you have a groundloop you must address. This article should help you troubleshoot further: Ground Loops - Eliminating System Hum and Buzz | Audioholics

more like a 0.01%er ;)