In Reply to: RE: You need to elaborate. posted by Rob F on November 18, 2007 at 17:47:15:
Here is what you can try before you go the electronic crossover and second amplifier route.
Wire the two 12" speakers in parallel, that makes a 4 ohm load.
Wire an 8 ohm 25W resistor in parallel with the 8", that makes a 4 ohm load.
Wire the two 4 ohm loads in series with each other, that makes an 8 ohm load.
Because of the voice-coil inductance of the 12s, the high end feeding the 8 will roll off. You also want to keep the HF out of the 12s and feed it to the 8. All you need to do is put a cap in PARALLEL with the 12s. I would start out with about 50µF and go from there.
This will raise the volume of the 12s almost 6dB with respect to the volume of the 8. Adjusting the cap and the value of the resistor will fine tune the levels and tonal balance.
If you want to take some of the deep bass out of the 8 and into the 12s, put an inductor in PARALLEL with the resistor/8 combo. I would start with about 2.5mH and go from there.
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Follow Ups
- OK - djk 01:55:48 11/19/07 (0)