@twoleftears Is that sarcasm or a fact. Sorry sometimes I don't get sarcasm.
Running Benchmark AHB2 in bridged mode and 4 Ohm Speaker
Does running this amp in bridge mode mean each channel will see half the impedance i.e 2 Ohm each when connected to a 4 Ohm speaker. If so will this cause a problem when the speaker dips to 3 or 2 ohms?.
Anyone running Benchmark AHB2 in bridged mode with low impedance speakers?.
Anyone running Benchmark AHB2 in bridged mode with low impedance speakers?.
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- 185 posts total
geek101 OP Probably peak also. Here’s your spl at 3mts in your room for a stereo AHB2 seeing a 4ohm load (210w) into your 94dB effcient speakers. 110dB spl! say good-by to your hearing. And "if" they were 8ohm 94dB speakers and your amp would give then give 105w your still at an in room SPL of 107dB!! still ear shattering! To my limited knowledge even after bridging Benchmark seems to out perform its peers.If this were the case, and there are no downsides as I've explained, then why not just have bridged amps if they out perform in all areas. Cheers George |
@geek101 Now I just have to decide if I need to buy two amps or just live with one. Does bridging bump up the 18A per channel limit or keep it the same. Non bridged amp can send 18A per channel so I am guessing bridged version can put more than 18A to a single channel. How do I calculate this number?. The output current is not increased in bridging, it stays the same, only the voltage doubles so the power quadruples. The amp now thinks its driving half the resistance so a 4 ohm speaker looks like 2 ohms. 2 ohms x 18 amps will voltage clip at 39 volts and thats peak not RMS. This is now lower than you would clip had you NOT bridged the amplifier. :( An amplifier of this power would likely have about 60 volt rails and would provide those 60 volts to the point where 18 amps became the limit at around 3 ohms. Now you are paying more to get less. Seems no one has yet to point out this little problem. I expect some disagreemet with this calculation so lets chat about it. I read the specs, the amp is not rated to drive a 4 ohm load bridged let alone when the 4 ohms dips. With 18 amps of current be happy. The amp is rated down to 3 ohms and will happily drive 2 ohms, but don't bridge it. If you want two amps then use them as bi amps. At least you have a chance of some sonic advantage. If you are smart, filter the inputs so the woofer channel doesnt see the highs and the tweeter channel doesnt see the lows. Just a simple RC at the input. Hitting a few more posts lightly. They promote bridging so they can sell you two amplifiers obviously. Why do we need all this power? |
- 185 posts total