Running Benchmark AHB2 in bridged mode and 4 Ohm Speaker
With all due respect George, it's not a matter of believing what I want. Implying higher distortion in bridged mode for the AHB2 is incorrect. This has been independently verified. Not sure why you keep insisting on this? https://www.stereophile.com/content/benchmark-media-systems-ahb2-power-amplifier-measurements |
I presume you mean current compared to power output not physical size? I meant of that size power wise, not physically. Now we have a report of 29 amps. This is like the stock market. Or are we just playing poker and raising? I will bet you that this amp bridged into a 4 ohm load played at 1/3 average power will probably overheat. Where is John Atkinson when we need him? :) 40 amps of current is needed to produce 40 volts peak (100 watts RMS) across a 1 ohm dip in impedance. If this impedance is reactive the amplifier will be really unhappy. ps. I did read the review by JA. It's worth a look but doesnt answer all the questions. It's clear to me what the OP should do. One amp or get busy and truly BiAmp. When are we going to get out of the sandbox? |
@tobes With all due respect George, it's not a matter of believing what I want.Thanks for this link. JA knows how to measure things. However he did not precondition the amp bridged at 4 ohms. No biggie here, but the OP is asking about bridging at 4 ohms which I am certain would get very hot. My answer to the OP remains the same. Do not bridge this amp into a load that dips below 4 ohms. For that load, the amp will provide more power if not bridged. That analysis does depend on getting some of the facts straight, such as 18 amps vs 29 amps. Guys if you really want to do something. Bypass the crossover in your speaker, crossover at line level with simple RC or active crossover, get two amps and let each see their driver DIRECTLY. Put a monster SS on the bottom and some nice tube or class A SS amp on the top. Generally less poweron top because most tweeters are padded down in the crossover. The crossover in a speaker is its weakest link. |
Implying higher distortion in bridged mode for the AHB2 is incorrect. It’s all in the measurements and how they’re presented, just look. Distortion graphs Here is the graph NOT BRIDGED 8ohms https://www.stereophile.com/images/1115BAHB2fig04.jpg Here is the graph NOT BRIDGED 4ohms https://www.stereophile.com/images/1115BAHB2fig05.jpg Here is theStereophile graph BRIDGED 8ohms https://www.stereophile.com/images/1115BAHB2fig06.jpg They are very similar yes? what do you think will happen if another measurement was done at 4ohm in the bridged mode????? It will be far worse than the non bridged into 4ohms or 8ohms, that’s why they didn’t give the graph even though they probably did measure it. Cheers George |
