Low output from pro plus?

[thatdoodle]

Hello,

At max volume out of my pro plus using RCA into a pair of Fosi V3 monos I'm not getting particularly loud output. I've tried hooking up a multimeter to each of the output channels and playing some test tones between 50hz-1000hz and am reading roughly 0.6v-0.1v respectively. The test tones are 0dB, and I've tried using both Spotify from my partners phone and YouTube music from mine.

I've checked my settings and the WiiM is at 2vrms in the settings, volume limit is set to 100% and volume of the unit was set to 100% while testing. I'm not sure what else could be causing the output to be so low, as the ASR review was showing almost exactly 2vrms out using a 1khz test tone.

Any suggestions would be greatly appreciated.

 

[canard]

you need truerms multimeter...

 

[thatdoodle]

Not for reading a pure sine test tone.

What is true-RMS? | Fluke

The need for true-RMS meters has grown as the possibility of non-sinusoidal waves in circuits has greatly increased in recent years. Some examples include variable speed motor drives, electronic ballasts, computers, HVAC, and solid-state environments.

www.fluke.com

At any rate, even with a clipped waveform the average reading should at least be close to the rated output (2v) not 5-30% of the expected reading. I've used this meter plenty of times in the past and gotten accurate voltage readings. A low reading multimeter also does the opposite of explaining the low volume levels I'm experiencing from my speakers.

 

[rlovison]

Hello,

At max volume out of my pro plus using RCA into a pair of Fosi V3 monos I'm not getting particularly loud output. I've tried hooking up a multimeter to each of the output channels and playing some test tones between 50hz-1000hz and am reading roughly 0.6v-0.1v respectively. The test tones are 0dB, and I've tried using both Spotify from my partners phone and YouTube music from mine.

I've checked my settings and the WiiM is at 2vrms in the settings, volume limit is set to 100% and volume of the unit was set to 100% while testing. I'm not sure what else could be causing the output to be so low, as the ASR review was showing almost exactly 2vrms out using a 1khz test tone.

Any suggestions would be greatly appreciated.

Did you have the "Fixed Volume Output" set to ON to rule out your WiiM volume control as the problem?

 

[canard]

verified now pro plus...true-rms pro 50000/ 100khz/11Mohm ...precaution for limiter pre-gain etc .. R 1.9707/ L 1.9706 vrms 1khz 0db...
;-)

 

[thatdoodle]

Did you have the "Fixed Volume Output" set to ON to rule out your WiiM volume control as the problem?

I did not, I have enabled this now and am measuring 0.392v with a 1khz 0dB test tone, and 1.884v with a 60hz tone.

Edit: Ignore these readings. My meters frequency response range is only 40-400hz. Using a 100hz test tone I get a proper reading of 1.986v. Measurement error by user.

verified now pro plus...true-rms pro 50000/ 100khz/11Mohm ...precaution for limiter pre-gain etc .. R 1.9707/ L 1.9706 vrms 1khz 0db...
;-)

I'm not sure of the point of your comment. Congratulations that your measurements line up with what is expected and measured by others out of this device. My output is significantly lower than this which is why I made the thread.

 

[canard]

I did not, I have enabled this now and am measuring 0.392v with a 1khz 0dB test tone, and 1.884v with a 60hz tone.

I'm not sure of the point of your comment. Congratulations that your measurements line up with what is expected and measured by others out of this device. My output is significantly lower than this which is why I made the thread.

It was just to point out a methodology that works with a quality true rms, AC mode.. you just have to check that on the Wiim home side or your measuring means it is ok before concluding... if this is indeed correct...then your Wiim is for the sav...
what is your multimetre truerms?

 

[thatdoodle]

It was just to point out a methodology that works with a quality true rms.. you just have to check that on the Wiim home side or your measuring means it is ok before concluding... if this is indeed correct...then your Wiim is for the sav...
what is your multimetre truerms?

Please stop repeating trueRMS when it is not required to get accurate voltage readings for a simple sinusoidal waveform. This will only cause confusion and potentially uneccesary expense for others who may read this thread in future.

I have just edited my previous post as there was a reading error was caused by using test tones close to and above my meters frequency response. Using a 100hz sine I get proper measurements close to 2v

 

[canard]

let's say that modern true rms have become the standard for a while and have become not very expensive or very inexpensive in China... and they actually have ac bandwidths wide enough for many uses... including ours in a comfortable way...
that's all...
more than 40/400hz (seemed hardly at ease with even a 50 or 60hz...)
;-)

but glad that it's only a problem of methodology... but the story of level with your fosi is elsewhere it seems...
your expectations and high listening levels or music listened to loudly?
low speaker rendement?
low voltage power supply of fosi?
a very large room?
hearing becoming failing? etc...
good luck...

 

[slartibartfast]

I did not, I have enabled this now and am measuring 0.392v with a 1khz 0dB test tone, and 1.884v with a 60hz tone.

Edit: Ignore these readings. My meters frequency response range is only 40-400hz. Using a 100hz test tone I get a proper reading of 1.986v. Measurement error by user.

I'm not sure of the point of your comment. Congratulations that your measurements line up with what is expected and measured by others out of this device. My output is significantly lower than this which is why I made the thread.

You would expect any meter to measure 50/60Hz correctly. They will spend most of their lives measuring those frequencies.

 

[canard]

What is true-RMS? | Fluke

The need for true-RMS meters has grown as the possibility of non-sinusoidal waves in circuits has greatly increased in recent years. Some examples include variable speed motor drives, electronic ballasts, computers, HVAC, and solid-state environments.

www.fluke.com

I've used this meter plenty of times in the past and gotten accurate voltage readings. A low reading multimeter also does the opposite of explaining the low volume levels I'm experiencing from my speakers.

"Yet a true-RMS meter is widely preferred because it is the only one that can accurately measure both sinusoidal and non-sinusoidal ac waveforms.

• Sinusoidal (sine) waves: Pure, without distortion, with symmetrical transitions between peaks and valleys.
• Nonsinusoidal waves: Waves with distorted, irregular patterns—spikes, pulse trains, squares, triangles, sawtooth and any other ragged or angular waves."

(My reaction may not have been so stupid ;-) )
(perhaps you just use it for cc mesureaments not ac....)

 

[canard]

You would expect any meter to measure 50/60Hz correctly. They will spend most of their lives measuring those frequencies.

I didn't really dare say it....

 

[rlovison]

I have just edited my previous post as there was a reading error was caused by using test tones close to and above my meters frequency response. Using a 100hz sine I get proper measurements close to 2v

So, do you still feel your output from your Fosi's is still too low? If so, compared to what? Can you do or have you run a test with a CD player with an adjustable output to see if the output is also too low? Is your gain on the RCA input set to 31dB?