2. amps-preamps
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Audio Research LS15 vs. SP14

I’m not sure about the production date for these preamps but they seem to be within the same price range in the used market, basically within a $1200-$1500. All things being equal, which one do you folks prefer in terms of sound quality. I’ll be using it just as a basic preamp with an SS amp, ML Aerius speakers and a CD player so I don’t need a lot of features, just sound quality. Thanks.

Edited to add Audible Illusions Modulus3 as another option although it's priced somewhat lower than the ARC components referenced.

128x128kalali

Showing 2 responses by almarg

almarg's avatar
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almarg
9,670 posts
 
A point to be aware of is that as with many ARC preamps and line stages, the LS15 and SP14 have output impedance characteristics that may make them unsuitable for use with some solid state power amps having lowish input impedances.  Specifically, according to the information at www.arcdb.ws:

LS15:  "40K ohms minimum load and 1000pF maximum capacitance"

SP14:   "Recommended load 60K - 100K ohms and 100pF. (20K ohms minimum and 1000pF maximum)"

The load capacitance recommendation (as opposed to the load resistance recommendation) probably won't be an issue unless the length of the cable to the power amp is particularly long.

Regards,
-- Al
 
almarg's avatar
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almarg
9,670 posts
 
P.S: Stereophile’s measurements of the output impedance of the Audible Illusions Modulus 3A was around 1800 ohms, presumably at a mid-range frequency and therefore probably higher at some other frequencies. If the Modulus 3 was similar in that respect it would also raise concern about impedance compatibility with some and probably many solid state power amps.

Regards,
-- Al

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