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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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It is currently 16 Oct 2018, 12:51

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 Post subject: Sub amp
PostPosted: 30 Jun 2018, 11:34 
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Joined: 26 Sep 2015, 13:59
Posts: 58
I am looking for a circuit for a sub amp to be driven from the back of my valve preamp. It needs to have a stereo input and a mono output to drive a single sub speaker. I would like it to have have variable cut off frequency and variable gain. I'm thinking that Ideally a chip-amp would suit. Any thoughts from anyone?


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 Post subject: Re: Sub amp
PostPosted: 30 Jun 2018, 13:58 
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Joined: 06 Apr 2009, 10:08
Posts: 1465
Location: US Pacific Northwest
There are any number of amps that are suited for a sub amp. You could use a chip amp. You could also use one of the many class-D modules on the market.

But there are some important things to consider. Like how much power and sensitivity do you need? Do you need or want separate volume controls? (Yes I know, one output. But sometimes the ability to control how much one channel dominates is desired.) Do the inputs need to be buffered before combination? Have you chosen a bass driver yet? What are the driver characteristics?

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 Post subject: Re: Sub amp
PostPosted: 30 Jun 2018, 14:14 
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Joined: 26 Sep 2015, 13:59
Posts: 58
Thanks Matt,

I have already built the sub cabinet using a single Volt P510 which I picked up cheaply. A single gain control would suffice. I'm really looking for flexibility more than anything, things don't stay the same too long in my system!

I will be driving it from the back of my SRPP preamp.

Thanks.


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