Hi Guys,
I got 2 problems probably connected:
I recently built a sub and I also put together the amplifier with some aliboards and a Dayton LF.
The Amplifier is a L15DSMD irs2092 and the PSU is a 350W +-50V +12V (More 250W than 350W...).
Here the links to the actual parts:
PSU
Amp
Preamp
Whitout preamp:
When I start cranking the volume it goes into protection with a rather low volume. Everything shuts down and turns on again and keeps doing it and the volume is quite low compared to the main speakers (Small and not very sensitive JBLs guess 85/87 Db)
So low volume, barely usable, have to set the sub channel to +6db to have a balanced output with the mains (Sub volume 100%)
With preamp:
I also have a preamp board (Actually 2 and it happens with both), but if I try to connect them even more problems kicks in as it goes into protection right away without even music, if I disconnect the power to the amplifier or to the board everything stays on at least without or with low music. If I disconnect the Load everything stays on.
In your opinion is it a problem related to the amplifier or to the PSU ro what?
The sub is an Infinity 1240W 12inch 4 OHM in a 35l sealed (the Dayton is currently set as pass trough).
The input signal is from the sub channel of a Cambridge Azur 351R.
Thanks for any hint you can give me! Don't really know where to look!
I'm a mechanical engineer, so I'm crap at EE...experimenting and learning...🙂
D.
I got 2 problems probably connected:
I recently built a sub and I also put together the amplifier with some aliboards and a Dayton LF.
The Amplifier is a L15DSMD irs2092 and the PSU is a 350W +-50V +12V (More 250W than 350W...).
Here the links to the actual parts:
PSU
Amp
Preamp
Whitout preamp:
When I start cranking the volume it goes into protection with a rather low volume. Everything shuts down and turns on again and keeps doing it and the volume is quite low compared to the main speakers (Small and not very sensitive JBLs guess 85/87 Db)
So low volume, barely usable, have to set the sub channel to +6db to have a balanced output with the mains (Sub volume 100%)
With preamp:
I also have a preamp board (Actually 2 and it happens with both), but if I try to connect them even more problems kicks in as it goes into protection right away without even music, if I disconnect the power to the amplifier or to the board everything stays on at least without or with low music. If I disconnect the Load everything stays on.
In your opinion is it a problem related to the amplifier or to the PSU ro what?
The sub is an Infinity 1240W 12inch 4 OHM in a 35l sealed (the Dayton is currently set as pass trough).
The input signal is from the sub channel of a Cambridge Azur 351R.
Thanks for any hint you can give me! Don't really know where to look!
I'm a mechanical engineer, so I'm crap at EE...experimenting and learning...🙂
D.
I also have a preatty big start noise, probably that's what puts the thing in protection from the start already...same when I turn it off.
Edit: Typo
Edit: Typo
Last edited:
The seller of the preamp told me I cannot use the same power supply for both Amp and Preamp...is this correct? should I set a small AC/DC12V converter and supply the preamp from there?
It wouldn't solve the protection issue, but if that's the way to do it may work correctly with the preamp.
It wouldn't solve the protection issue, but if that's the way to do it may work correctly with the preamp.
Disconnect all wires attached to power supply 12V tap, solder the amplifier input directly to rca socket, connect it to your Azur 351R LFE output and see if you can get sound from the woofer.
If there no sound, the problem could be the amplifier or power supply.
Update: I tried to disconnect everything from the 12V outlet and it works a lot better! it goes into protection earlier than reaching the limits of the sub as expected, but now I have enough to have fun. Can a signal processor bring to protection a 1A 12V psu section?!? I'll put an additional mini PSU 12V and try to connect everything from there!
Another question: What's the 10R resistor just before the output? it smoked, but still reads 10R...I'll change it to be sure, but what is it for?
Another question: What's the 10R resistor just before the output? it smoked, but still reads 10R...I'll change it to be sure, but what is it for?