phase linear

[P.L.F.]

Read an article where Bob carver stated the optimum power for these speakers (Carver Amazing Loudspeakers) 1250 watts a side.

The Platinum are 6 ohms of nominal impedance (http://www.stereophile.com/floorloudspeakers/290carver/index.html) and standard line was 4 ohms (http://akdatabase.org/AKview/albums/userpics/10004/Carver Amazing Service.pdf) - something will get fried :nono: ...
With White Oak Phase Linear 700 upgrade, no bridging, you will drive both models without any sonic sacrifice anyway. An earthquake in your house guaranteed ...

 

[P.L.F.]

Phase Linear 700 Amp mono bridging

There was also PL factory service bulletin on this topic with another approach but cannot find it at this moment. Generally they were suggesting a transformer connected to the inputs, as to bridge an amplifier you simply invert the phase of one channel. You may do this with a passive transformer. An unbalanced to balanced line level transformer was exactly the solution from Lynnwood PL factory tech support...

... and I've found the bulletin!

 

[P.L.F.]

Part of it perhaps but the main problem was no DC protection for the speakers. If the output shorted you’d have 80 volts going to the speakers. This turns your woofers into 800 watt space heaters. (This is simple ohm’s law not accounting for any droop in the PS output. Whatever the droop there are plenty of reports of speakers catching fire.) This is easily and cheaply corrected with an add-on DC protection circuit.

Originally Phase Linear factory in Lynnwood was planing to add one -> see the attachment. Due to cost cutting the idea was abandoned. A good & proven solution is: http://home.earthlink.net/~dimlay/id24.html

And for PL 700 it won't be 'only' 80 VDC but >100 VDC (close to 120 Volts after power caps)...

 

[Locobreth]

Dave can you post a bigger pic too. I think your rack looks much better!

 

[Locobreth]

By the way thanks for all the info! The more I know when I take them in the more I may sound like I know something!

 

[maxhifi]

I have a phase linear 4000 preamplifier. It has about 1000 electrolytic capacitors which all need to be replaced, have been failing one by one, and if is constructed using circuit cards. Not a bad idea but the contacts don't always make contact.