active or passive preamp for active speakers

Active is not ideal and never will be. Sorry, had to say it.

Passives are system dependent. Some people select surrounding components around them wisely. Some get lucky. Some, usually the most vocal about it, don't get lucky. Although, if you've seen the length of the Lightspeed thread, passive fanboys aren't exactly passive either. Don't get me wrong, passives are designed to be compatible in most systems. Very basically, the source has to drive the amps with a passive volume control.

With your long XLR's and limited flexibility, you're chance of luck is less than average. Off the top of my head, I can only think of Bent, Goldpoint and Promitheus offering balanced passive models and only one of those has remote control.

BTW, saw a PS Audio PCA-2, one of my favorites, for $800 on the listings.

thanks for the responses.

i guess i don't understand the purpose of the preamp. since my active speakers don't have volume control, it seems the only thing i need a 'preamp' for is volume control, assuming at least that the signal coming for the cd player is strong enough. and if i hook a tuner up too, then it would need to switch between sources.

so why not a passive preamp to do those simple jobs?

I generally don't like passives, but both of my present amps have passive pre amp sections and I've yet to find an active that improves upon their sound. Yesterday a shindo was a disappointment with my torii.

That said, I'm still looking.

It's not a simple job. The aspect you're forgetting is control in the electrical sense. Impedance, cables, that sort of stuff. The other thing is that you will likely have to convert from RCA inputs to XLR outputs.

i guess i don't understand the purpose of the preamp. since my active speakers don't have volume control, it seems the only thing i need a 'preamp' for is volume control, assuming at least that the signal coming for the cd player is strong enough. and if i hook a tuner up too, then it would need to switch between sources.

so why not a passive preamp to do those simple jobs?

For a passive preamp to provide good results:

1)It has to be driven by components having low output impedances. That is probably not a problem here if the cdp and tuner have solid state output stages, although it could be a problem if either component has a coupling capacitor at its output, which most tube source components and some solid state components have.

2)The amp or active speaker that it drives has to have an input impedance which is high in relation to the passive preamp's output impedance (which will be much higher than the output impedance of a typical active preamp, and will also vary with volume control setting). This might be a problem here -- the input impedance of the BM5AMkII doesn't appear to be specified.

3)The passive preamp has to be connected with short lengths of low capacitance cabling, especially on its output side, but the input side can be important as well. That may also be a problem here, depending on your setup and on no. 5 below (which determines how much capacitance is acceptable).

4)The gains and sensitivities of the components in the system have to be such that the preamp does not have to provide any gain (i.e., any gain greater than 1). That is probably not a problem here. With the tuner, and perhaps also with the cdp, you will probably not be able to drive the speakers to their maximum possible output level with a passive preamp, but you probably wouldn't want to.

5)The architecture and resistance value of the passive preamp have to be carefully chosen in relation to the impedances of the components it is connected to.

The bottom line: I would not proceed in that direction without first somehow determining the input impedance of the active speakers.

Regards,
-- Al