Hello !
I'm a recent user of Sonic T5066, and I can't turn the volume more than half , without clipping. The PSU is a regulated one ,at 12.5 v.
Does anyone has a solution, or this is a normal limitation of the S.I. ?
Thanks !
I'm a recent user of Sonic T5066, and I can't turn the volume more than half , without clipping. The PSU is a regulated one ,at 12.5 v.
Does anyone has a solution, or this is a normal limitation of the S.I. ?
Thanks !
Salut Ciu,
This may be normal, the S.I. version has a lot of gain as it is made for portable devices that have a low output signal.
It sounds like your signal source must be pretty strong. My stock S.I. will go to more than half (about 1 o'clock) on the output of a standard CD/DVD player.
Remember that this amp will give you no more than about 8 watts peak. That means only around 1/8~1/5 watt RMS level on music.
How efficient are your speakers? Do you need to go past half?
This may be normal, the S.I. version has a lot of gain as it is made for portable devices that have a low output signal.
It sounds like your signal source must be pretty strong. My stock S.I. will go to more than half (about 1 o'clock) on the output of a standard CD/DVD player.
Remember that this amp will give you no more than about 8 watts peak. That means only around 1/8~1/5 watt RMS level on music.
How efficient are your speakers? Do you need to go past half?
Hello Panomaniac, Thanks !
My Sonic is in the original configuration, no modification.
My speakers are 91db efficient, but I'm going to buid a Supravox LB, that would be 94-96db Eff.
May be my input source (direct CD ) is too high, I'm going to connect via my Pre-amp, with the ajustable output level.
What is the "good" PSU voltage ? 12v, or 13.2 v, the upper limit ?
R.C.
My Sonic is in the original configuration, no modification.
My speakers are 91db efficient, but I'm going to buid a Supravox LB, that would be 94-96db Eff.
May be my input source (direct CD ) is too high, I'm going to connect via my Pre-amp, with the ajustable output level.
What is the "good" PSU voltage ? 12v, or 13.2 v, the upper limit ?
R.C.
I've been running one on a 14v regulated supply with 4ohm loads and the amp runs fine. I've never had it go into thermal protection, but that may be do to the heatsink I added.
If your supply has enough current to up the regulated voltage to 13.2v or even a little higher, you shouldn't have any problems.
MEXXX
And if you are going to use a preamp to set volume, turn the Sonic pot all the way up (to the right). Or better yet, remove it.
Let us know how it goes.
Let us know how it goes.
I tried ,first to add a pre-amp before the SI input, to lower the input signal : quite no change in clipping.
The idea was given by MEXXX (up !). I was using a small regulated PSU at 12.5v .
In few minutes, I build a basic PSU, from a 80VA toroidal trans 2x9v ( only one used ) , 4 hight speed rectifiers BYW 98-200, and a 10 000 uF capacitor (Philips low ESR), no regulator added !!! (I think a regulator is a serious bottle-neck ).
With the SI switched on, the output voltage is 12.4v.
Now, I'm in another world ! The sound is better (fluent, coloured) , and up to the output I can support, there's no more problem with clipping.
A good advice for newbies : before tweaking the SI, feed with a large power supply !
R.C.
The idea was given by MEXXX (up !). I was using a small regulated PSU at 12.5v .
In few minutes, I build a basic PSU, from a 80VA toroidal trans 2x9v ( only one used ) , 4 hight speed rectifiers BYW 98-200, and a 10 000 uF capacitor (Philips low ESR), no regulator added !!! (I think a regulator is a serious bottle-neck ).
With the SI switched on, the output voltage is 12.4v.
Now, I'm in another world ! The sound is better (fluent, coloured) , and up to the output I can support, there's no more problem with clipping.
A good advice for newbies : before tweaking the SI, feed with a large power supply !
R.C.
Make sure the ground side of your speaker terminals aren't connected to each other. I had an accidental connection between the two negative speaker terminals on my first SI test amp, and my amp had the following symptoms:
- very fuzzy upper mids and treble. not horrible, but certainly not audiophile quality. Sounded like a $20 amp!
- horrible clipping and intermittent amp shutdown at about 75% of the normal max level for a T-Amp
My "short" between the two terminals occurred when I was testing the amp in my main system, and didn't disconnect all of my old components before wiring this up (long story)...
-Rich
- very fuzzy upper mids and treble. not horrible, but certainly not audiophile quality. Sounded like a $20 amp!
- horrible clipping and intermittent amp shutdown at about 75% of the normal max level for a T-Amp
My "short" between the two terminals occurred when I was testing the amp in my main system, and didn't disconnect all of my old components before wiring this up (long story)...
-Rich
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