Monoblocks did not work


Help me with this problem pl. I had one Classe CA-400 driving Dunlavy V'S with all Classe front end. I was very happy with the sound, so happy I refused to upgrade for 3 years. That the power bug hit me. What if I buy another CA-400 and run each as monoblocks. I did, with all other components remaining same( same IC's going to each amp). The result was way worse than expected. Thin , hashy, ambient sound. Power of 800W/ch (into 4 ohms) became 2400 W/ch, still bad sound. What happened? How do I make use of the beast (120lbs) that I have aquired?
nilthepill

Showing 2 responses by beemer

Hello Nilthepill:

Yo are on the right track except you strapped your amps mono. By bridging you increased output power hower reduced current from the amps thus losing some control of the speaker by the amplifier as now the amps see the load at half the previous impedance. In other words, If your speakers are a 4 ohm load, in bridged mode each amp sees a load of 2 ohms. This would account for the bright and hardness you now experience!

If you can biwire your speakers, remove the jumpers and do so. I am assuming that you have one long run of interconnect, and have the amps next to the speakers. If so, you'll find with a short run of speaker cable you can use almost anything! As to splitters, even a cheap pair of Rat Shack splitters will give you an idea of what is possible.
Use them on the amp end and then use one channel of each amp on the woofers, and the other channel of the amp on the tweeters. I can virtually guarantee this will result in improved sound!

Paul
Nilthepill:

Shame on me, I assumed you were using single-ended interconnects. Rat Shack will not have any balanced Y
adaptors. Tough call here. I still believe your sound will improve from biamping, however you will need balanced y connectors (not sure these are available) or a second run of balanced cable (if) your preamp has 2 sets of balanced outputs! Good luck!

Paul