Another Bi-Amp Question

If this could be done,you will have a power loss and lower volume.If your speakers are 8 ohm and you split them,each half will be about 16 ohms.Hooking the 16 ohm half to the receiver will cause the power output to drop to approximately 65 watts since it will be driving a 16 ohms load.This will cause about a 3 db loss in sound.You'll have about 65 watts x 4,if your equipment allows bi-amping.I could only see a volume loss doing this.

Cerrot: The only possible reason for bi-amping (without replacing the built-in crossover with a custom external one) is to increase the power output to the speaker. However, any such increase is minimal. There is no reason to expect any other difference for the bother. (Gratuitous opinion.)

Hifitime: That is simply false. Impedance analysis will demonstrate that each leg of a crossover will still show the same impedance as the combination since each leg will have a very high impedance outside of the pass-band for that leg. The individual and combined pass-band impedances are the same. Thus, with biamping there is no loss of output and any power increase is real but minimal (<3dB).

Kal

The speakers are rated as "Recommended amplifier power 50W - 120W into 8Ω on unclipped programme." That means 120W on typical musical material. Typical musical material has much lower energy levels at treble frequencies than at lower frequencies. Therefore the 120W rating applies only to the low frequency driver, especially in view of the relatively high crossover frequency (4kHz).

Tweeter power handling capability is usually far less than woofer power handling capability. However, speaker damage occurs most frequently as a result of high volume bass peaks causing the amplifier to clip. The clipped waveform contains high frequency spectral components that are not present in the original music waveform, and the speaker's crossover routes that extraneous high frequency energy to the tweeter, causing it to have to handle more power than a music waveform would normally require it to.

None of that will change as a result of the bi-amping scheme you propose, apart from a probably inconsequential reduction in the amount of current each amplifier channel will be required to supply. And keep in mind that the power delivered to the speaker is determined not by the amplifier power, but by the music and by the volume control setting (as long as the amplifier's voltage and current capabilities are not exceeded).

HiFiTime -- Respectfully, I don't think that is true. The impedance that the speaker has at low frequencies (below the crossover region) will be the same regardless of whether or not the tweeter and its crossover elements are connected. Likewise the impedance at high frequencies (above the crossover region) will be the same regardless of whether or not the woofer and its crossover elements are connected.

Regards,
-- Al

Cerrot, I think I understand your question and the answer is- that even if you biamp using the two rear channels it will not double the power but will still be 130 watts to each driver and will not hurt your speakers. I can't say if you will notice a difference or not, but hey give it a try and see. Good Luck!

Thank you, Almarg. As always, appreciate your your input.