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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: I certainly agree with #2 if one is actively filtering, but surely... posted by jeffreybehr on July 15, 2005 at 19:56:18:
(1) Both PAs will see a rough tormented impedance vs frequency load. So,"select amps that are better suited to one frequency range than others" will mean select amps which are better suited to that impedance vs frequency load. Change it (change the speaker for example), and it's likely it won't be "best suited" again.
With active biamping, the smooth impedance seen by the PAs, and each of them only outputting its own frequency range, make things much easier, and objective measurements will be much better matched to subjective ones. In others words, good tech-speced amps will give great sound without having to select among dozens of esoteric PAs. (this arguments gets stronger with tubed PAs, as the output transformer is not a friend of turmented impedance curves)(2) about cables, the same applies: with active multiamping, you don't need so much to tweaks the cables, the source impedance being virtually zero, and the load impedance being a little inductive before the resonance, then lightly capacitive above the resonance, then resistive up to the cut frequency, then inductive again.
So, to feed the tweeter (connected directly to the wire), a low inductance wire (twisted litz wire for example) will work VERY fine for ANY tweeter-and-amp-pair.
To feed the bass, a low capacitive wire will work fine. If your wire is less than 7m long, a heavy gauge 4-wire main wire (wires connected two by two) will work fine for a penny (sorry, maybe not high-tech enough, but _for bass alone in an active multiamped system_, I'm unable to hear any difference between mains wires and highly priced ones, and my friend neither, although she was trained by the french navy for submarine detection though listening of sonar echos and doppler differences, at a time where such signal processing was done by humans -BTW, humans are best in submarine detection than computers- . So, we don't know whether she has "golden ears" or not, but people officially put their own lifes into her trained ears. I have a slight tendency to believe it's a better criterium for competent hearing that writing info-ads in a hifi journal)By the contrary, by using passive biamping, you want to buy or build wires for which you're talking in milliohms for resistance, nanohenries for stray inductance, nanafarads for stray capacitance, dielectric storage in the picocoulombs, and you're not worried about passing your signal through millihenries, hundreds of milliohms, microfarads, and dielectric storage in the millicoulombs.
Furthermore, those millihenries, hundreds of milliohms, microfarads, and dielectric storage in the millicoulombs, are connected to a load whose main features are its DC resistance, which can vary about 20% between coldest and hottest temperatures, and inductance, which can vary up to 50% (long voice coil) or 30% (short voice coil) depending on voice coil position. Yet seems hard to optimize the pair speaker/PA in these conditions, so, as for the cables....But we live in a free world, do as you like. Just don't expect to skyrocket your system performances until you use real active biamping with direct connection of PAs and speakers.
Ask also for the less expensive solution, taking into account the ease of choosing the right pair, and the saving in exotic cables and PAs (you can do yourself the tweeter wire, or use one of J. Risch's recipes). Then open your ears...
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Follow Ups
- Active Biamping vs passive - Jacques 04:26:12 07/18/05 (1)
- Jacques, I surrender! Besides, I already said I agree that active biamping... - jeffreybehr 09:51:19 07/18/05 (0)
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