2. amps-preamps
  3. 1252070270

Tube Preamp/ McCormack Amp impedance matching

Hi all, the tube preamp in question, (VTL 2.5) has a 200 Ohm output impedance. Amplifier (McCormack DNA-500) has a 10k Ohm input impedance. I think this should be a pretty good combination, impedance-wise. Would you try to do more to optimize the combination with any of the impedance matching devices out there? Or, go as is? I'm aware of 2 impedance matching devices, ATI "The Match-maker" and Burson Audio's AB-160 Buffer.
Thanks.
foster_9

Showing 7 responses by foster_9

foster_9 OP
1,638 posts
 
My concern is the effect of impedance on HF or low end roll off. Newbee, my speakers are the Ohm Walsh 5000. I also have 2 powered subs that would be connected to the 2nd set of pre outs on the VTL so that plays into impedance as well.
foster_9 OP
1,638 posts
 
Thanks Newbee and Al. Al,I'm using 20ft runs of Blue Jeans LC1 cables which I learned from you are low capacitance. I believe the input impedance on the sub amps are 6k ohms.
foster_9 OP
1,638 posts
 
Forgot to say the subwoofer cables are Blue Jeans LC-1.
foster_9 OP
1,638 posts
 
Subs are Earthquake Supervova Mk12IV. I'll see what I can learn on the preamp outputs.
foster_9 OP
1,638 posts
 
Al, Thanks for everything. I'm now using an ATI MM100 Match Maker between amp and preamp as a work-around of impedance issues and the added subwoofer's impedance. It sounds good so far in the signal chain but I haven't turned on the subs yet.
foster_9 OP
1,638 posts
 
Al, I'll email you
foster_9 OP
1,638 posts
 
Acman3, the ATI is no longer in the chain. My gear is still settling in and first I want to hear where things are headed. I'll try to let you know.
More to discover