Rotel75
Member
Just learned about gain/impedance/voltage recently.. having volume issues.
Here's what I have:
- PC with Lyrion Music Server (USB out)
- SMSL SU-1 (2V RCA out)
- STR12A Cary SLP-90 tube preamp clone (9x gain, 47k input impedance, unknown output impedance, RCA)
- Fosi V3 mono (input impedance RCA 25k, XLR 5k)
- MB Quart 800 (90dB efficiency, 4 Ohm)
It sounds great to me. I try to keep the sources at 100% if possible.
But at the preamps lowest volume setting (001/128) it's already loud.
What helped a bit was using the XLR input of the V3 mono (adapter).
I guess the preamp gain is too high in my case. I measured up to 11V AC with a simple meter.
Should I replace the preamp with a DACpre?
When SU-1 is connected to V3 mono directly, I had to set the source to 15%.
What if it resets to 100% by mistake?
I could get less efficient speakers I guess
Should I have gotten an amp with volume control?
I like the relais/resistor+remote volume on my preamp.
It should be possible to use it separately, skipping the tube part.
Would solve my gain issues, right?
Is there a "best place" to do volume control?
- digital source / software
- dac digital
- dac analog
- preamp input
- preamp output
- amp input
- amp output
Here's what I have:
- PC with Lyrion Music Server (USB out)
- SMSL SU-1 (2V RCA out)
- STR12A Cary SLP-90 tube preamp clone (9x gain, 47k input impedance, unknown output impedance, RCA)
- Fosi V3 mono (input impedance RCA 25k, XLR 5k)
- MB Quart 800 (90dB efficiency, 4 Ohm)
It sounds great to me. I try to keep the sources at 100% if possible.
But at the preamps lowest volume setting (001/128) it's already loud.
What helped a bit was using the XLR input of the V3 mono (adapter).
I guess the preamp gain is too high in my case. I measured up to 11V AC with a simple meter.
Should I replace the preamp with a DACpre?
When SU-1 is connected to V3 mono directly, I had to set the source to 15%.
What if it resets to 100% by mistake?
I could get less efficient speakers I guess
Should I have gotten an amp with volume control?
I like the relais/resistor+remote volume on my preamp.
It should be possible to use it separately, skipping the tube part.
Would solve my gain issues, right?
Is there a "best place" to do volume control?
- digital source / software
- dac digital
- dac analog
- preamp input
- preamp output
- amp input
- amp output
Last edited: