32blownhemi Posted January 31, 2018 Share Posted January 31, 2018 I have Jubilee Bass Bins with the K-402 horns with K-691 Drivers. I'm bi-amping with two Mc275 amp's. Is there a link (or on-line brochure) that shows the Ohm requirements of the Klipsch K-691 Drivers? I need to e-mail the spec's. Link or picture? ... Thank You! Bill Quote Link to comment Share on other sites More sharing options...
Deang Posted February 1, 2018 Share Posted February 1, 2018 The driver is made by P.Audio. It’s an 8 ohm driver. Quote Link to comment Share on other sites More sharing options...
The Dude Posted February 1, 2018 Share Posted February 1, 2018 1 hour ago, Deang said: The driver is made by P.Audio. It’s an 8 ohm driver. I believe the k-691 is made by B&C. Quote Link to comment Share on other sites More sharing options...
mikebse2a3 Posted February 1, 2018 Share Posted February 1, 2018 10 hours ago, Deang said: The driver is made by P.Audio. It’s an 8 ohm driver. My understanding is the K-691 is basically a B&C DE75 8 ohm with modification. Bill maybe when @Chief bonehead has time he will share the raw impedance plot with the K691/K402 with us and the Frequency Response with his Active Application. Maybe this will help in the mean time for what it's worth: Here is the B&C DE 75 P 8 ohm Data taken with the driver on a B&C ME 75 Horn from the B&C website. I would suspect any modification for Klipsch on this driver and loaded on a K402 would possibly smooth and/or possibly lessen some of the peaks and possibly lessen the rising impedance with frequency toward the upper end of the spectrum but the minimum in the frequency range of interest is at least 8 ohm and I suspect it would be for the K-691 also. B&C DE 75 P 8 ohm.pdf Here is the Impedance Plot from the pdf above. Hope this is of some help, miketn 1 Quote Link to comment Share on other sites More sharing options...
Chris A Posted February 1, 2018 Share Posted February 1, 2018 Bill, Here is a measurement of a K-691 driver in free air (blue trace is ohms, red trace is phase): The DC resistance looks to be ~5.8 ohms. Chris 1 Quote Link to comment Share on other sites More sharing options...
32blownhemi Posted February 6, 2018 Author Share Posted February 6, 2018 Thank You Everyone! McIntosh told me the reason the tubes in my Mc275 (with 50-60 hours on it) had gone bad was because I was hooking up to the 8 Ohm connections. That this was causing my amp to work twice as hard as necessary. They said the Jube's were 4 ohm's & the horns 5 ohm's. But my Jube Bass Bins say 8 ohm's on them. So they were wrong. I just wanted to know what ohm the horn's were. Thanks again! Bill Quote Link to comment Share on other sites More sharing options...
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