jason from volo wrote: Wed Nov 17, 2021 12:59 pm
Potentially stupid question w/ obvious answer:
Are there any advantages to having a simple setup such as turntable -> preamp -> powered speakers?
(Other than reducing number of components to a minimum and potentially being the most compact?)
(Any sonic advantages?)
my opinion is that there can be advantages, but it has to do with the details.
First, it depends on what is going on inside the powered speakers. Is it just a mono amp in the speaker box driving the woofer and tweeter through a passive crossover that also happens to be in the box? Advantage as compared to an externally housed amp, is fewer boxes, and the good chance that the amp is sufficient to drive the speakers tor reasonable volume without shutting down. To the extent power amps can have a specific sound, presumably the amps were chosen by the designer to compliment the crossover and drivers. Mono passive biamping is what it is, and you do get the advantage of two mono amps with two separate power supplies. Disadvantages are you cannot upgrade the speakers and the amp separately, difficult serviceability, compromises to amp design to fit inside a speaker box, compromises to speaker design to fit an amp. I can't see much in it net net - since a good stereo power amp (or two good mono amps) housed in separate boxes from the crossover seems like the best combination of flexibility and sound quality. And yeah, fewer boxes if that is important to you. its not terribly important to me.
If, on the other hand, the powered speakers are using an active crossover and separate amplifiers for each driver then you get the further advantage of more amps working less hard, and an active crossover which is generally better than a passive crossover. Custom tailored, etc. etc. Downsides as above, plus your cool active crossover shares a power supply with 2 or 3 power amps. Not ideal but probably still better net net.
I love active systems, and I think, all else being equal, they sound better for several reasons.
1) more amps means each amp is less stressed and has more headroom for natural sounding dynamics and less distortion.
2) an active crossover is dealing with a line level signal, but has its own power supply so it is an active circuit, not just ramming a speaker level signal through big chokes, resistors and capacitors. there are other reasons to prefer active crossovers which I don't fully grasp, but in my experience they sound better.
3) active crossovers allow for some adjustment to compensate for taste, room issues, etc. sort of like much fancier and lower noise tone controls or eq.
There are some different implementations of active systems - for instance, Linn and Burchardt (and some others) sell a system that consists of a digital hub/preamp that digitizes everything (that is not already digital) then sends it to the speakers (sometimes wirelessly) where it is converted back to analog and amplified through dedicated in-speaker amps, usually one amp per driver. so it is basically a digital active crossover. This allows more fine eq adjustment, and coupled with a microphone and software, the ability to automatically tune the system ("calibrate") to fit the specific room it is in. The analog purist in me shudders, but digital is so good these days that ultimate resolution and fidelity apparently does not suffer, according to reviewers I respect. I have not heard a system like this but I would love to. Still, the drawbacks are as above - with amps inside the speakers, you can't really upgrade them, if something dies, it is harder to fix or replace. Compromises to fit the amp inside the speaker box, and vice versa.
Contrast this with a regular old analog active system (like I have) where you have an analog domain crossover between your preamp and several power amps (usually one for each driver, again). No software room correction is really possible and you have lots more boxes and cables to deal with. Still better than passive speakers, all else being equal, but expensive and complicated. I find myself falling down the Naim rabbit hole and looking at outboard power supplies for everything. Right now, for me, the ultimate solution.
so, blathering aside - it depends on what your powered or active speakers are actually doing.