Impedance Matching Question

koestner
The Burson Buffer has not been made for quite a while now, and are hard to find. However Burson has this ingenious RCA cable with a small solid state buffer built into it. It is powered by 5 Volts DC. It will help with most any impedance mismatches.

Don’t know how good that would be, as it runs off the +5v usb supply, and from what I’ve seen it looks to be an opamp based buffer, and for audio these +5v single ended supply buffers are not too good, and I think they also would have to be capacitor coupled as they have dc offset with switch on/off thumps. 
Cheers George

George, thank you very much for your additional comments. I was already leaning toward not getting the Burson cable. I have found that the Polk Audio RTi A3 is on closeout for $240/pr, so not much more than the cable. It got an excellent review in Stereophile and made the Recommended Components list. It also has a real wood veneer cabinet, so definitely seems to be worth the current price. I'm thinking it's 89-90db sensitivity is likely enough that I'll just use the Advent 300 with the VTL. It's a small room and I don't need extreme volume. The Advent is surprisingly strong for 18 watts. Guess it was designed to have good current output since it was used with the original Advent speaker. Thanks again for your help.

Polk Audio RTi A3 is on closeout for $240/pr, so not much more than the cable.

Yeah definitely the money shot is for the speakers, how come we don’t get those kind of deal down here in Oz, it really ****** me off. Enjoy!


Cheers George

I'm sure if you look around you find an iTube around $200 soon enough, 

Nice find, now that looks good I think, seems to be tube input with ss output great combo to get low output impedance and high input impedance.
100k input impedance and 1ohm!!!! output impedance, can be used as a unity gain buffer, or preamp with gain and volume control.

" 8 DIP switches that allow us to select the gain (0dB/6dB) and whether using it as a pre-amp or as a buffer with the help of a flat screwdriver (like the one included)."

https://www.head-fi.org/showcase/ifi-audio-itube.16539/reviews

https://www.audiostream.com/content/ifi-itube-active-tube-bufferpreamplifier

Cheers George