by plexus Sun Apr 29, 2012 10:48 pm
no preamp. i don't use a preamp. the only reason to use an active preamp is if your sources dont have enough gain to drive the amp. for example, my sources are: DAC, phono stage and video receiver. my DAC is a pro-audio unit (Benchmark DAC1) and has more than enough output to drive my Mk3's to overload. the phono preamp is a VTA PH15 and it has again way more output than needed. same with the video receiver. so, no need to boost the gain of any of these sources.
I made up a switch box with 6 inputs into a Emla rotary switch that goes into a khozmo 48-step Dale/Vishay attenuator and right into the amps. I dont turn it much past 50% for loud volume. no active preamp, much better sound. now this passive line stage (PLS, as it could be called) was pricey because i used premium parts. about $450 to be exact, mind you i got a deal on some of the parts so it didn't cost me that much. however, using cheaper parts (will you actually notice a difference? probably not), you could use a regular rotary switch, the passive attenuate that Bob and Roy (VTA) sells (i think its $50), and some cheaper RCA jacks. you could likely put it together for $150 including a case and 4-5 inputs.
You can also find pre-made ones on ebay. there are some good ones out there and prices vary.
