I have already sent the message below to support@fosiaudio.com and received a quick reply that looks like it is an AI response.
My experience with AI responses has been mixed at best, so I'm hoping to get experienced human-brained replies, please.
My biggest regret is that there are so many questions, but those are what kept coming out.
Thanks for any serious replies to any of the questions.
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Hello,
I want to use my Fosi Audio TP-02 Subwoofer Home Audio Amplifier to drive a ~12VA to ~24VA transformer with a 40Hz to 70Hz Sinewave. So far, this looks very promising.
I am very excited in what I am seeing, so please excuse me for all of my questions. I’m trying to get this right.
What is the input impedance for the two R and L inputs?
I can supply an input to the TP-02 between 0 V and ~3 V peak.
Do I need to eliminate the DC level from my input supplied to the TP-02 or is it safe to leave the DC in my input signal?
Is there a maximum amplitude I should not exceed as input to the TP-02? (Please include units (Vpeak, VDC, Vpeak-to-peak, etc.)
Will DC left in my input signal affect the clipping point/distortion point of the TP-02?
What is the optimal peak to peak voltage input? The sweet spot.
What is the maximum peak to peak voltage input without damage or distortion?
Do I need to tie the two inputs (R and L) together or can/should I leave one unconnected?
Or, should I tie the unused input to ground through a resistor of what value?
Do the R and L input signals add together before proceeding through to the output?
I was going to put a clamping circuit on the output of the TP-02 to prevent spikes from the transformer getting back into the TP-02 and damaging it.
Do you have a recommended voltage spike level I should clamp on?
What’s the highest impedance (highest resistance) I should put on the output as a load for the TP-02 before it starts distorting the output or harming itself?
Leaving the output of the TP-02 completely unloaded worries me that I might damage it.
If I have more than one of these TP-02 amplifiers, can I tie their “-” “sub out” lines together without harming the TP-02s?
It looks like I should NOT tie the “-” “sub out” line to the power supply ground?
I am using the TP-02 passive output and not the TP-02 active output. Is this the recommended output here?
I am using the 24 VDC power supply that came with the TP-02, and I got the following reading. Does this sound about right?
Just before waveform clipping: 35.2Vp-p @60 Hz Sinewave out, 0.5 Vp-p input on the red (R) channel input, white channel (L) input left unconnected, 40 Ohm load on the output.
I noticed that the “sub freq” knob and the “VOL” knob seem to work together to set the total gain for internal 2-stage amplification; they seem to work together to produce the final gain of the amplifier?
Is there an optimum setting for these knobs? Halfway for one of them? I can supply an input to the TP-02 between 0V and ~3V peak-to-peak, but I’ll probably want to leave the input about 2.2 V peak to peak with a 1.1 VDC component. Is this OK? What is optimal? Should I put a DC blocking capacitor on the input of what type and value?
Is there a newer version of the TP-02, like the Fosi M04 Subwoofer Power Amplifier or the Fosi Audio M03 Subwoofer Mono Amplifier?
Are the answers for the above questions the same for the newer version?
Which one will give me the most undistorted, Voltage peak-to-peak output?
Thank you!!!
My experience with AI responses has been mixed at best, so I'm hoping to get experienced human-brained replies, please.
My biggest regret is that there are so many questions, but those are what kept coming out.
Thanks for any serious replies to any of the questions.
------
Hello,
I want to use my Fosi Audio TP-02 Subwoofer Home Audio Amplifier to drive a ~12VA to ~24VA transformer with a 40Hz to 70Hz Sinewave. So far, this looks very promising.
I am very excited in what I am seeing, so please excuse me for all of my questions. I’m trying to get this right.
What is the input impedance for the two R and L inputs?
I can supply an input to the TP-02 between 0 V and ~3 V peak.
Do I need to eliminate the DC level from my input supplied to the TP-02 or is it safe to leave the DC in my input signal?
Is there a maximum amplitude I should not exceed as input to the TP-02? (Please include units (Vpeak, VDC, Vpeak-to-peak, etc.)
Will DC left in my input signal affect the clipping point/distortion point of the TP-02?
What is the optimal peak to peak voltage input? The sweet spot.
What is the maximum peak to peak voltage input without damage or distortion?
Do I need to tie the two inputs (R and L) together or can/should I leave one unconnected?
Or, should I tie the unused input to ground through a resistor of what value?
Do the R and L input signals add together before proceeding through to the output?
I was going to put a clamping circuit on the output of the TP-02 to prevent spikes from the transformer getting back into the TP-02 and damaging it.
Do you have a recommended voltage spike level I should clamp on?
What’s the highest impedance (highest resistance) I should put on the output as a load for the TP-02 before it starts distorting the output or harming itself?
Leaving the output of the TP-02 completely unloaded worries me that I might damage it.
If I have more than one of these TP-02 amplifiers, can I tie their “-” “sub out” lines together without harming the TP-02s?
It looks like I should NOT tie the “-” “sub out” line to the power supply ground?
I am using the TP-02 passive output and not the TP-02 active output. Is this the recommended output here?
I am using the 24 VDC power supply that came with the TP-02, and I got the following reading. Does this sound about right?
Just before waveform clipping: 35.2Vp-p @60 Hz Sinewave out, 0.5 Vp-p input on the red (R) channel input, white channel (L) input left unconnected, 40 Ohm load on the output.
I noticed that the “sub freq” knob and the “VOL” knob seem to work together to set the total gain for internal 2-stage amplification; they seem to work together to produce the final gain of the amplifier?
Is there an optimum setting for these knobs? Halfway for one of them? I can supply an input to the TP-02 between 0V and ~3V peak-to-peak, but I’ll probably want to leave the input about 2.2 V peak to peak with a 1.1 VDC component. Is this OK? What is optimal? Should I put a DC blocking capacitor on the input of what type and value?
Is there a newer version of the TP-02, like the Fosi M04 Subwoofer Power Amplifier or the Fosi Audio M03 Subwoofer Mono Amplifier?
Are the answers for the above questions the same for the newer version?
Which one will give me the most undistorted, Voltage peak-to-peak output?
Thank you!!!
