Sure TA2024 + speaker level plate amp?

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pjanda1

pjanda1

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Joined 2005
wildburroaudio.com
#1
Is there a problem summing the speaker neg terminals on a Sure TA2024 board? I recall that this was an issue connecting plate amps to the old Sonic Impact, but also that some claimed it worked fine. I'm thinking of giving my brother-in-law a sub to connect at speaker level, but I don't have the Sure amp in front of me to play with and I want to be sure it will work. I must be using the wrong search terms to find the answer. . .

Paul
Wild Burro Audio Labs - DIY Full Range Speakers
 
#6
There's something you're not reading correctly here.

The "magic cable" talk about the amp input. Can you use a resistor network here? Sure.

You were asking if you could sum the negative outputs, essentially bridging the amp, and whether you could do that? Under no circumstances can you bridge an already bridged amp, it will be fried instantly!
 
#7
The magic cable runs from the speaker level outputs of the T-amp (they use them with the Sonic Impact version of the TA2024) to the RCA inputs of the plate amp, which have a common ground! Somehow or another, dozens of folks are connecting both negative terminals of a TA2024 to a common ground with nothing active in between. (SI amps are common amongst the Horn Shoppe crowd, and I think you can even see a pic of one driving a plate amp at audio circle). Maybe I should just email Ed, but he's a cantankerous fellow.

Paul
Wild Burro Audio Labs - DIY Full Range Speakers
 
#10
I emailed Ed to ask about the guts of the "magic cable", Here is his reply:

Paul, There was a 20k resistor in line with each "positive" and one negative had a 10k resistor in series with the ground. this gave enough isolation in most cases. You can also just put a 20-50k in series with both positives and leave one of the channels negative unconnected. This usually works fine too. The problem is the grounds can not be connected together directly.
Hope this helps.
Click to expand...

Paul
Wild Burro Audio Labs - DIY Full Range Speakers
 
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