Bi amp pros out there I could use some help! First time Bi Amping...
Thanks rodman99999 just another opamp based one though, I have tried a quite a few and in the end was disappointed, then spent the time and built my own discrete active 4th order xover @150hz just for the bass of my Monoliths, It’ just I’ve always wanted Nelson Pass’s B4 as it's discrete also. Cheers George |
The op amps are only in circuit below the crossover point. There's just one capacitor(I used polypropylene) between the preamp and mains(notwithstanding the extra connections/cabling). I wasn't using a preamp at the last, but a Placette Passive Linestage, in which I installed the high-pass cap, to eliminate the extra connections(bypassed the DQ-LP1, etc). It doesn't get much more transparent. Happy listening! |
I just (in the past week) sold my DQ-LP1. I at one time used it as rodman suggests, for just the 3rd-order low-pass filter, installing a capacitor on the input jacks of my power amp for high-pass filtering, THE way to do it if a 1st-order filter (6dB/octave) is steep enough for your needs. You CAN use the DQ-LP1 to do the same, but you need to match the replaceable-cap value to the input impedance of the power amp anyway, so you may as well do it inside the amp, and save yourself the cost (and potential sonic penalty) of an extra pair of interconnects. The B4 is MUCH more versatile than the DQ-LP1, providing 1st/2nd/3rd/4th-order filters---both high-pass and low-pass, in 25Hz increments from 25Hz to 3200Hz., and level controls for either (but not both) filter, for bi-amp balancing. As George said, fully discrete, no opamps or ic’s. Cute little bugger, but single-ended only. If you need balanced, you must go up to the Pass x/o, which is a lot more dough. |
As George said, fully discrete, no opamps or ic’sOr coupling caps, "best coupling cap is no coupling cap" Cute little bugger, but single-ended only.Nothing wrong with that, no need for balanced unless your doing 10mt interconnects. And many source outputs and poweramp inputs have "pseudo" balanced anyway. They are just SE with a balanced opamp in the path for the xlr connection. So the SE will actually sound better in these circumstances, as your not sending the signal via the xlr opamp with SE output/inputs Cheers George |
Right you are George, but some power amps (for instance my Music Reference RM-200 Mk.2) have (true) balanced inputs (created by Modjeski with discrete components, no opamps or transformers. He's a very clever designer) only, and some pre-amps have (true) balanced outputs only (Atma-Sphere's, for example). I'm sure the Pass x/o provides benefits over the First Watt B4 other than balanced outputs, but that to me is academic. I don't have the $ for the Pass! |
