Why? It's pretty unlikely that it's audible for the overwhelming majority of people with the overwhelming majority of speakers. It's feasible that it might be an issue in some cases, but it's easy enough to determine.
Actually, most higher end power amps didn't, and still don't have volume controls. I bought my first "separates" power amp in 1984, and my aiyima a07 max's are the 1st amps I ever bought with volume pots. Actually, I take it back; last year, I bought a used pair of crown xls2000's; they also have volume pots. Adcom, electrocompaniet, alchemist, audio mirror, hafler, mesa; nary a volume pot anywhere. Maybe more consumer focused amps?
I guess I was attempting to focus on the thing that’s more likely to matter.
Most speakers are not linear in phase and impedance at all and so they will interact with the high output impedance of the Wiim amp. Now, as much as I like an amplifier that is true to the signal, others may not care.
www.audiosciencereview.com
www.audiosciencereview.com
And in one case I know of, four zeros. Not so many zeros, in my case, because I've always been cheap, heh! But I bought two aiyima a07 max's specifically for my main "critical listening" system; a horn based active 4-way setup. I was considering the fosi v3's but preferred the speaker connection of the aiyimas.
I understand your point, but my point is the frequency issue is still extremely unlikely to be audible, and I think it just upsets a lot of people because of how it looks on a graph. When in reality, it's the possibility of about 0.5db-2.0db rise above 20khz, and who's going to hear it, even with speakers it may affect?
I've never had a problem dialing in my subs, in a variety of rooms, with a variety of different speakers. No dsp needed, although I did use it once, with a deqx pdc-2.6. I still have it, but it's a pita to use, so it sits. I've had great results just using a pink noise generator and spectrum analyzer to adjust my outboard active crossover.
I'd say "it depends". Like the amp, some dacs' performance varies with the level attenuation, and some may perform better with their volume pots maxed out.
I sure can hear a 1db difference in level in the presence region. But this anomaly doesn't even begin to come into play at all until the high treble range. You will never hear the difference.Most speakers are not linear in phase and impedance at all and so they will interact with the high output impedance of the Wiim amp. Now, as much as I like an amplifier that is true to the signal, others may not care.
I can easily hear a 1 dB difference in the presence and up. I bet you can as well.
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Complex impedance load amp FR influence - WiiM Amp review by Erin
That’s a start, though the THD vs Frequency vs Power is very hard to read. All other graphs are not biased to 0 dB, making them also harder to read. He will improve no doubt :)Complex impedance load amp FR influence - WiiM Amp review by Erin
It is quite clear these kinds of deviations are generally audible in A-B tests. Cheers. Do you have a link for that?
Unless the woofers in your main speakers are crossed over to their midrange drivers ~200hz or less, it's still useful to high pass them with an active x-over, imo.
In this case, if you have a balanced source, the only "benefit" is you don't have to use an adapter on your xlr/xlr cable - the adapter is built in to the amp. But the amp isn't a balanced amp. Its internal circuitry would have to be doubled to be truly balanced.balanced is nice if your source is balanced... otherwise you have to get a strange cable... like XLR balanced out to RCA input.... why not get the balanced version of the amp if your source has balance output... XLR balanced to XLR balanced input.... see how that works
Simplest solution would be to have the speaker outputs automatically high passed at 80hz if a cable gets plugged into the subwoofer output. 99% of your users will connect to a powered sub so won't need a low pass there. You could make the hi-pass adjustable, a bit less simple, from 0hz to, say, 150hz, which should handle pretty much anything, from no hi-pass crossover to 150hz; either continuous, or 4-6 different set frequencies. I'd also recommend 24db/octave slope.
The example by Erin's complex load is a mild one with a 20 ohm peak. It can easily get to 60 ohm for some speakers and high ° of phase. This exaggerates the issue even more. For 3 or 4 way crossovers it could also be present at even lower frequencies. You can see from the trace that even the mild 20 ohm peak has ripple effects much below its actual peak frequency.
This is a good question. If they are not independent, it would be better to just delete the low pass crossover altogether. Let the powered sub handle it. There are times having independent high and low pass crossover points are better.
I'm sure, as I said, that there may be some cases where a particular speaker may be more susceptible to this. And there are undoubtedly people who are more sensitive to this.The example by Erin's complex load is a mild one with a 20 ohm peak. It can easily get to 60 ohm for some speakers and high ° of phase. This exaggerates the issue even more. For 3 or 4 way crossovers it could also be present at even lower frequencies. You can see from the trace that even the mild 20 ohm peak has ripple effects much below its actual peak frequency.
Also; if you'd be so kind to combine your responses into less posts if you respond to many different ones at the same time. You can make several quotes into one post. This make the thread look a bit cleaner.
