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Old 29th November 2019, 03:32 PM   #1
jdsackett is offline jdsackett  United States
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Default TU8200 with Klipsch speakers

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.
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Old 29th November 2019, 06:02 PM   #2
planet10 is offline planet10  Canada
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TU8200 with Klipsch speakers
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):

Click the image to open in full size.

And the FR:

Click the image to open in full size.

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
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Old 29th November 2019, 08:46 PM   #3
Badchile is online now Badchile  United States
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I run a TU-8200 with Heresy III...no problem at all.
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Old 1st December 2019, 01:54 PM   #4
jdsackett is offline jdsackett  United States
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Yeah, I was a bit afraid of that. Thanks Planet10.

Heresy speakers are different than the rf series, but thanks for the reply.

I.ll search around and see if i can find suitable speakers before I buy the kit. Thanks again, J.D.
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Old 1st December 2019, 05:49 PM   #5
planet10 is offline planet10  Canada
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TU8200 with Klipsch speakers
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.

Click the image to open in full size.

The FR of the HIII from elsewhere:

Click the image to open in full size.

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
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Old 3rd December 2019, 03:03 AM   #6
gpdavis2 is offline gpdavis2  United States
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The 8600 might be a better choice.
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Old 4th December 2019, 02:22 PM   #7
jdsackett is offline jdsackett  United States
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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.
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Old 4th December 2019, 02:45 PM   #8
gpdavis2 is offline gpdavis2  United States
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Understand........ the problem being, it is becoming more & more difficult to actually listen to any gear with the increasing lack of bricks & motar shops. Am driving 100mi Saturday to one and would not be going if there wasn't an excellent used LP store adjacent to their shop.
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Old 4th December 2019, 07:06 PM   #9
planet10 is offline planet10  Canada
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TU8200 with Klipsch speakers
I don’t know the numbers but i suspect the SE 300B amp will have even higher output impedance, making the issues with the ugly impedance worse.

dave
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Old 4th December 2019, 11:27 PM   #10
paczeltf is online now paczeltf  Hungary
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The TU-8600 uses some local negative feedback to the cathode of the output tube, but I agree that it will hardly give you much better results from a damping factor perspective.

btw, the measured output impedance of the TU-8200 is 2.93 Ω at the 8 Ω setting and 1.88 Ω at the 4 Ω setting.
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