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I don't know Dennis' operating points, but he may be optimizing his amps for specific tube types. The KT88 is often run as low as 3.5K while the EL84 or 6V6 are run as high as 7K. If I had to make a guess (and this is only a guess) Dennis is running his amps with 5K primaries, which allows some leeway for tube types from KT88 to 6V6. If that is true, using a 16 ohm speaker may actually make a 6V6 sound better, while a lower impedance speaker may sound better with a KT88. Coincidentally, the 16 ohm speaker will present an easier load for the lower power 6V6 while the lower impedance speaker will present a more difficult load for the higher power KT88. |
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All speakers present compromises, so do amps, I did not need to have a SET, I could have chosen a PP design for power, I just don't like the tradeoffs. I need at least a real 104 dB's sensitivity in a decently priced set of speakers for a true DHT SET to shine. I may find it someday. Regarding the active SUBs, I'm planning to add a stereo set of those and replace my aging Velodyne, in due time. That should help both amps as well. Thanks for the feedback. |
Musica,
You don't need 104db to enjoy true DHT. I had a 45 driving 98db 12" single drivers and it was plenty. Probably 3 watts with EML solid plates. The speakers were actually too much for my room. If I had a huge man cave.... I think I'm going to give the Omega CAM's a go. There is something special about single driver alnico speakers. At 95db they should work well. What I hope to gain is texture and tone. Louis has a 30 day trial so there is little risk. |
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The 95 dB's rated sensitivity may turn out much lower in reality, so beware. That is my experience with Tekton. Sound great but are really not 98 dB's-equivalent in real life conditions. Interesting your former 45 SET could be well-driven by nominal 98 dB'speakers ... My listening room is small and I usually listen near-field, so there may be some hope there, but I believe my Tekton's are not 98 dB's, more like 94 or so. Again, I'm not in a rush, we'll see. In the meantime, I want to really dial-in my Triode-strapped KT88 Inspire gear and enjoy it to the max. One thing that concerns me is the bad job the 6V6 output tubes do in my gear, to the point these sound anemic. This is, I believe, an indication the speakers are not helping them sing. 6V6 G ST's might yield only 4 watts of power, whereas the 6V6 GT's somewhere around 5 watts with the right rectifiers. In my Tekton set the sound is anemic. 6L6 and KT88 are another thing altogether. These results are always with the LP-27a preamp in the equation. |
Zu + Inspire
Hi BC,
My room isn't large, approx. 12' wide, 10' from speakers to listening position (another few feet between the speakers and the wall) - but there's no back wall to my listening area - it opens up into the kitchen. Actually quite good for limiting reflections. My genre is mostly Americana, Grateful Dead, etc. No Metallica or speed metal.... ;^) Take a look at the impedance curve on the Zu's. There's a big bump up to around 55 ohms at 30 Hz, and 65 ohms in the curve at about 75 Hz. I can only guess that's what's behind the loss of bass control with the Inspire. I lack the technical expertise to diagnose this. I did re-solder my OPT leads to (first) the 8 ohm tap and then (second) the 16(?) ohm tap at Dennis' direction. Going from the 4 to the 8 ohm helped, but didn't solve the problem. The 16 ohm tap just seemed lifeless. The Zu's are great speakers though - very musical and fun to listen to with the right amp. Don't give up on the Zu's. You might want to do some kind of crossover and hand the bass off to a subwoofer? That's the paradox though - the Zu's are capable of the bass, but the Inspire wasn't. I was using a Inspire LP-2 with the KT-150. I used a bunch of different tubes in the KT-150, even up to some vintage Tung-Sol KT6550's and some nice ECC88 types, but nothing fixed the bass (Track 1, Disc 2 from Lucinda Williams "Down Where the Spirit Meets The Bone" was my pass/fail. The bass on this track would fuzz out and get very saturated and muddled.). Clean and deep bass on the First Watt amps and a ToolShed Amps Transcendence 12 (KT-88's driven by E80F's). Quote:
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It is a mismatch between the speakers and amp, not the fault of one or the other. Did you have a triode or pentode amp? |
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The pentode amp is @ 5 watts. |
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I was hoping you would describe your music tastes as,... well, awful, but alas we have similar music tastes. I have time to ponder the whole issue in that I will be awaiting the addition to the house which is still in design phase. Anyone have experience with omni type speakers. I am interested in the idea of a larger prime listening area than a typical single full range speaker. Conceptually a upward firing driver seems like it would spread the soundstage and focal area. Louis at Omega builds custom omnis. BTW, we just passed 2,500 posts. Thanks for starting this all Peter and thanks to all the contributors. |
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