Jeff Rowland

I'm not familiar with the specific amp, but in general I would not expect a bridged amp to provide good results when driving your particular speakers. As can be seen in the impedance curve shown here, the impedance of your speakers is in the vicinity of 3.5 to 4 ohms between 50 and 100 Hz, where lots of energy is often required, and is close to 3 ohms around 25 Hz. In bridged mode the amplifier will "see" a load impedance equal to half those values, i.e. 1.5 to 2 ohms, and of course most amps will not perform at their best when dealing with such low impedances.

Regards,
-- Al

Al,
Thanks for the technical information. Now it makes sense why Rowland was hesitant to say for sure bridged 525s would work.

Al is right (as usual). This amp most likely uses PASCAL S-PRO2 class D modules. Data sheet shows minimum load of 2 ohms or 4 ohms when bridged. Bridging might create problems with your speakers gaining only about 20% of loudness. Not worth trying IMHO.

http://www.pascal-audio.com/downloads/S-PRO2_Datasheet-1_20.pdf

Hello Al, Ricred, Kijanki, and all,

After reading this thread, it has led me to question my intention of using a second Class D CDA 254 amplifier, thus allowing me to use the two of them in bridged mode as monoblocs.

My speakers are of course different, they being Tannoy HPD 315's, 94 db sensitivity and 8 ohms. I don't know if you can draw any conclusions without specific test results, which in any case, wouldn't be available.

My particular application of these drivers are in custom 150 liter bass-reflex enclosures.

I have written to Tom, at Class D Audio, about this, but the expertise available here is without peer.

I'll be thankful for any information that can be provided.

My apologies to Ricred for hi-jacking his thread.

Regards,
Dan

Those Wireworld cables have a lot to do with your system's excellences