TU8200 with Klipsch speakers

jdsackett

Member
2007-03-24 11:20 am
Hi all. Thinking about building a 8200DX kit. My main speakers are Klipsch rf7s. Anyone who knows Klipsch is aware of the impedance curve being all over the charts. What can I say, I like em. Anyway, will this amp have a problem driving these speakers?? Thanks, J.D.
 
The high output impedance of the SE amp will mean that a portion of the impedance curve will be convolved with the FR (as measured with a low output impedance amp).

Usually a wild impedance is a prescription for a low output impedance amp.

So unless the speakers FR just happens to complement the change caused by the impedance it is not likely to be a good match.

These are RF7-II (don’t know how different it is):

Klipsch%2520RF7%2520II%2520Impedence%2520Curve.jpg


And the FR:

Klipsch%2520RF7%2520II%2520Frequency%2520response.jpg


In this case, driven by a typical SE amp, looks like the impedance dips are close to the FR dips and the peaks are cloase too, so interaction will likely produce more uneven FR than w a low output impedance amplifier.

dave
 
Can’t find an impedance curve of the Heresy III, the one i found for H1 has as dramatic rise maxing out at about 3kHz.

post-453-0-91780000-1456333330.jpg


The FR of the HIII from elsewhere:

klipsch_heresy_III_frequency_response_1m.jpg


In your room, if the rise caused by the interaction of the impedance of the speaker and the SE amp, is countered by a dip in the speakers FR (as measured with a low output impedance amp) then the anaomaly fixes itself, if not you’ll have at least a slight rise.

dave
 

jdsackett

Member
2007-03-24 11:20 am
I thought of that. Have a couple reasons not to. First is the difference in cost. Much more inclined to spend less on a product i haven't personally heard. Second, I have 2 or 3 ribbed plate 12au7 tele's laying around and a matched quad of old winged c 6550s someplace. While you could do better than the winged c, you could also do a whole lot worse. So, I already have good tubes to fit the 8200. Not so with the 8600. Thanks for the reply. J.D.