Bridge or parallel
What series of OB's? they seem to have a pretty high sensitivity level 94 to 96db 1W1M and there impeadance seem's pretty normal 6 to 8ohm range, they do seem to have a little more complex frequency/impeadance curve.
I would go with a bridge if the impeadance wont drop below 6 to 8 ohms but only with a +/- 25 to 28VDC supply, as to keep the dissipation down.
If these things are really impeadance monsters I would go parallel at a higher supply voltage +/- 35VDC.
If you really want some get up and go, go with a BPA solution.
What series of OB's? they seem to have a pretty high sensitivity level 94 to 96db 1W1M and there impeadance seem's pretty normal 6 to 8ohm range, they do seem to have a little more complex frequency/impeadance curve.
I would go with a bridge if the impeadance wont drop below 6 to 8 ohms but only with a +/- 25 to 28VDC supply, as to keep the dissipation down.
If these things are really impeadance monsters I would go parallel at a higher supply voltage +/- 35VDC.
If you really want some get up and go, go with a BPA solution.
I'm running Hawthorne AUdio SIs at present. My Goodmans 201s are quite happy with a single-chip amp but they don't have to go so low as the SIs.
I'm using a single LM3875 IGC at present but comparing it with an Autocostruire CT MC4x100 (with the outputs paralleled) it feels like I could do with a bit more power for listening loud.
I've got a 28 volt regulated supply I can use so that's not a problem.
I just don't need as mch power as the BPA200 provbides.
I'm using a single LM3875 IGC at present but comparing it with an Autocostruire CT MC4x100 (with the outputs paralleled) it feels like I could do with a bit more power for listening loud.
I've got a 28 volt regulated supply I can use so that's not a problem.
I just don't need as mch power as the BPA200 provbides.
Well you should at least have an idea when you will need all that power Owen!
I'd have to buy more chips for BPA and this is intended to be a low cost project. In fact, even if I had enough chips, I would be tempted to build one bridged, and one paralleled GC, just to find out which did sound better with the OBs.
I'd have to buy more chips for BPA and this is intended to be a low cost project. In fact, even if I had enough chips, I would be tempted to build one bridged, and one paralleled GC, just to find out which did sound better with the OBs.
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