restorer-john
Grand Contributor
I'll see if I can find my thermocouple and measure my wife's the next time she leaves it in overnight. It's definitely quite warm to the touch.
I think you might have to rewrite that....
I'll see if I can find my thermocouple and measure my wife's the next time she leaves it in overnight. It's definitely quite warm to the touch.
Sonos gear has built in "loudness compensation". That's a possible reason for those A/B results.With no EQ, setup A sounded like if my speakers didn’t have woofers. Setup B, with no EQ sounded immediately more balanced. I then tried to adjust EQ (on setup A) and loudness/bass/treble (on setup B) to try to get the best sound out of both.
Setup A is able to play louder than setup B but it lacks something in the bass department. No combination of EQ compensates for this lacking of fullness in the low frequencies. I could get the lowest frequencies to be there but it’s like there was weak spots in the low frequency bands. Tried both parametric EQ and discrete frequencies EQ. No luck. No setting would give me the balanced full sound of the setup B. I also noticed that pushing frequencies way above zero on the parametric EQ resulted in having the audio compressed when played at high levels but I guess this is the way WiiM deals with avoiding distortion. To avoid this I EQed only below zero.
For curiosity purposes I also tested the WiiM with no EQ connected to the line-in of the Sonos Amp. Still no joy. The sound still lacks something in the lower frequencies.
Unfortunately I didn’t have a way to get a line level signal from the Sonos Amp to inject in the Topping PA5 II so I tested lossless Apple Music Air Play > LG TV > Topping PA5. Awful sound with audible distortion (even controlling the level out from the TV to a level comparable to the WiiM line out). I then tested the same thing but connected to the Sonos. I’d say it was slight better but still bad.
I’ve decided to return setup A (still on the 14 day period) as it has inferior quality (to my ears) compared to my old Sonos Amp.
My Sonos Amp was sometimes exhibiting interruptions of audio when streaming and it was slow responding to requests from the app so a bit painful to use. However, I’ve discovered that it was possible to downgrade the firmware from S2 to S1 and so I did it. It is now much faster with no interrupted audio. Happy
All this is to say that I’m disappointed with the performance of setup A despite the very good reviews they both have.
How can the Sonos sound so much better to my ears than setup A? I feel we are not measuring everything that matters in this tests. I know this testimonial of mine is very subjective but when I see the frequency response in @amirm tests and compare it with what I heard.. it just doesn’t match. Is it maybe dynamics? The time a certain frequency response takes to achieve a certain power level?
The volume circuitry cannot be bypassed.If I'm just wanting to use this as a power amp, I note there's no switch to disable volume.
Should we just be turning it up to full? Will this just turn it to full, or if you wind it right round do you effectively disable volume (turn it 'off') bypassing the volume circuitry?
Many thanks.
The volume circuitry cannot be bypassed.
When turning volume to full, you set the attenuation to zero.
I usually recommend setting your source to full volume, then attenuating the Amp accordingly.Presumably that's the best/correct option if using as a power amp?
+ it also may prevent an accidental high volume situation.I usually recommend setting your source to full volume, then attenuating the Amp accordingly.
That generally results in the highest SNR.
I usually recommend setting your source to full volume, then attenuating the Amp accordingly.
That generally results in the highest SNR.
+ it also may prevent an accidental high volume situation.
The difference is that the source is already at max level,there's no risk as it it was at -40db for example and a (rare) glitch skyrocketed it to 0db.Would that be any more or less of a risk than if this were a pure power amp with no volume control?
I can't see the difference.
A "pure" power amp with no volume control is always at full gain, whereas if the amp has volume/gain set to a lower setting, the maximum power you get if you turn up volume to full in the source is lower.Would that be any more or less of a risk than if this were a pure power amp with no volume control?
Although useful & great information has already been added by members in their replies, I am just adding or summarizing a few:Would that be any more or less of a risk than if this were a pure power amp with no volume control?
I can't see the difference.
Frequency response tells you everything you need to know about signal rise rate.hello everyone! I ask those who know to clarify the parameters of the signal rise rate in class D, and in particular in TOPPING PA5 II , are there measurements?
at what speed?Frequency response tells you everything you need to know about signal rise rate.
(as long as the amp can reproduce 20Hz to 20kHz, it can reproduce every signal transient your ears are able to hear)
at what speed?
Multiply the full power output voltage with the upper frequency limit.at what speed?
undoubtedly, but I need the parameter: Slew rate20kHz is 20,000 times a second.
If it can accurately reproduce 20kHz as 20 kHz with below audible distortion, I’d be interested to hear how that isn’t fast enough.
Why? The upper frequency limit and the full power output voltage swing already tell you the slew rate (but those two parameters are much more relevant).undoubtedly, but I need the parameter: Slew rate
30v*20 000Hz= 600 000 ???Умножьте выходное напряжение полной мощности на верхний предел частоты.