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Author Topic: Advantages of passive preamps? What to buy?  (Read 3028 times)

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mickeyvortex

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Re: Advantages of passive preamps? What to buy?
« Reply #10 on: June 06, 2015, 03:11:40 PM »

Thanks for this DaveBSC. The pro audio folks seem to be quite into their passive pres (eg, http://www.smproaudio.com/index.php/en/products/monitor-controllers/m-patch-5-1). Would that work?
    You are right about the DACs having multiple outputs. In the past when I was into a 5.1 set up, I used JRiver to configure Focusrite's USB Audio interface (model no. 18i20, I believe). Worked like a charm until the wife felt we had too many loudspeakers in the house :) 

Not really. If you're using a low output MC, your phono pre may need to apply 60dB of gain, maybe even more than that, before the signal is strong enough to be sent on to any active linestage. No preamp without a dedicated MC phono input can deal with tiny signals like that, regardless of whether its active or passive.

The reason why preamps in general are starting to fall out of favor is that fewer and fewer people need to be able to switch among 4 or 5 analog sources. Multiple sources are now being handled by the DAC, which may also have its own volume control.

Actives still definitely have their uses though. A passive pre that can handle 7 inputs, a tape loop, and drive SE and balanced out simultaneously like the 326 I don't think would be possible.


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DaveBSC

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Re: Advantages of passive preamps? What to buy?
« Reply #11 on: June 06, 2015, 05:00:43 PM »

Krell sounded more like that in the 90s.

Yeah I'm most familiar with the Krell FPB amps from that era, which are the ones that I thought were the worst of the worst. Some of their newer stuff is ok when using CAST, less so with conventional inputs. With Simaudio, Pass, and Accuphase around though I have little interest in Krell. Above those guys, Vitus and BAlabo are just insanely good, at admittedly ridiculous price levels.

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Anaxilus

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Re: Advantages of passive preamps? What to buy?
« Reply #12 on: June 06, 2015, 05:11:49 PM »

Is that why the newer Krells sound all warmed over, the CAST tech? I've noticed a lot of supposed current mode amps have this warmer gooey signature. Not all, but many.
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RexAeterna

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Re: Advantages of passive preamps? What to buy?
« Reply #13 on: June 06, 2015, 08:17:56 PM »

Only passive I see in pro audio is using the interfaces/adc/dac and processes as volume controllers. There is few passive drive mixers as well but, not as common as active ones and passives are usually far more expensive and not much use besides controlled indoor enviourments mostly.

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knerian

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Re: Advantages of passive preamps? What to buy?
« Reply #14 on: June 06, 2015, 09:23:39 PM »

Are you guys trying to get ohhgourami to commit suicide?  This is online bullying.
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RexAeterna

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Re: Advantages of passive preamps? What to buy?
« Reply #15 on: June 07, 2015, 05:15:41 PM »

How is it bullying or am I just interpting wrong...

Anyhoo, if op wants try passive he can and if he likes krell amps, that's awesome too. We have different likes. I use nothing but crown amps nowadays and I know there is still fair share of opinions on them which is fine to me. I just would suggest to op that some power amps require more then 2v especially for lower impedance drives for amp to truly reach full output especially if they have monstrous output and most high output amps can take a signal of +22dbu which is bout 9v RMS.most amps rated input is at 1khz only for full output with it's 1.4v sensitivity so sometimes passives are not ideal. You also have it's impedance and cable capatience(can't spell, sorry) that can have affect on both extreme ends of the fr.
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''I'm a music lover. Not an audiophile.''

''The World is Study.''

''I have no special talent. I am only passionately curious.''

''Logic will get you from A to B. Imagination will take you everywhere.''

Anaxilus

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Re: Advantages of passive preamps? What to buy?
« Reply #16 on: June 07, 2015, 06:06:51 PM »

Are you guys trying to get ohhgourami to commit suicide?  This is online bullying.

Well, listening to a Krell power amp might be considered offline bullying. :))
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Negura

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Re: Advantages of passive preamps? What to buy?
« Reply #17 on: June 07, 2015, 06:48:52 PM »

In my experience adding a preamp is going to sacrifice some transparency. Ideally the preamp would be better sounding than the amp itself, to compensate for that. I never used passives.
But any actives that were not at least as good sounding on their own, as my speaker amp took the sound a step or more back. What am I basing this off: For example, the Moon 430HA, Ragnarok and Audio GD He-9 can all play as preamps as well as headamps. Adding them to a power amp, my HE-6s and speakers sounded worse off (in that order from memory) than using the built-in integrated on the same speaker amp.

If I was going to buy a TOTL speaker solid state power amp, I would pair it with a top end tier tube pre-amp. Something like an ECBA. The cheapest I would try out of curiosity would be the Decware CSP2/3. You also get an OTL headamp. =)


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knerian

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Re: Advantages of passive preamps? What to buy?
« Reply #18 on: June 07, 2015, 09:51:48 PM »

How is it bullying or am I just interpting wrong...

Anyhoo, if op wants try passive he can and if he likes krell amps, that's awesome too. We have different likes. I use nothing but crown amps nowadays and I know there is still fair share of opinions on them which is fine to me. I just would suggest to op that some power amps require more then 2v especially for lower impedance drives for amp to truly reach full output especially if they have monstrous output and most high output amps can take a signal of +22dbu which is bout 9v RMS.most amps rated input is at 1khz only for full output with it's 1.4v sensitivity so sometimes passives are not ideal. You also have it's impedance and cable capatience(can't spell, sorry) that can have affect on both extreme ends of the fr.

I was just teasing ohhgourami but I may be too late, Anax's comment may just put one over the edge.
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ohhgourami

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Re: Advantages of passive preamps? What to buy?
« Reply #19 on: June 07, 2015, 10:57:04 PM »

 :'(
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