djk

That's what I call a Cornwall 1.5 with the K52K mid driver with the 70µF woofer cap and 12dB tweeter crossover. Those sounded pretty good, and I had several customers bring in their older Cornwall speakers and paid to have them updated. I bought all the take out parts, K55V and type 'B' networks.

"the amp draw will be" totally trivial (unless you're talking in kilo-watts).

Kappa Pro 15LF2C

It required a certain type of mental set to relax and ignore some artifacts from the encode/decode process. Than said, I really enjoyed a Klipschorn system I installed at a customer's house with his DBX records.

The better the equipment, the better good program material sounds, and the worse poor program material sounds. Sell them.

"With my kappa 15c in a Belle (ported), I still have mixed feelings about porting " Did you ever stop to think that the ultra low Qts (0.25) is a bit low for good ported use? This is the part # from Eminence, the makers of the speaker. SPEC 15162 PART # K-33 RE OHMS 3.39 FS HZ 34.46 LE MH .96 MMS GMS 78.59 QM 7.39 CMS mm/N .2714 QE .410 RMS NS/M 2.3037 QT .390 VAS LTRS 301.66 XMAX MM 8.20 SD SCM 889.59 BL TM 11.88 EBP 84.4 EFF % 2.91 SPL dB 96.6

"I have used the 15c several times, never had one contact motor board " So, you all are willing to re-cone anyone that has a problem? Right. For me, a gasket is cheap insurance.

Add another gasket if you intend to push things a bit, cheap insurance. I had a customer crumple some woofer cones (only the thin stock gasket) with a 75W Crown D150.

"he worked at Audio Room and sold Klipsch and B&W and Magnepan" I would probably know them? I suggest a pair of Cornwall II or Forte, and I will mod them for you for free (you pay for some new caps). The Forte sounds better IMO, but depending on how loud you listen you may need the Cornwall for it's efficiency (large room). Sometime next year I am building a golden mean listening room, but decided 10x16x25 was too big, and will go 9 x 14.4 x 23 instead.

I must point out that a vented LaScala is flatter, and goes higher and lower.

-25dB at 20hz. http://prosoundshootout.com/Measurements/index.php?cmd=image&sfpg=KlR1YmEyNF8yOHYuZ2lmKjU1OTU4NjM5N2YzMDY1N2UxNjBmNThiZDZkOTY3MDY3

" the difference between the contour and loudness controls, so go to it brothers and sisters! " The HK were no different than the others. The HK430 with the contour (loudness) on would clip on FM before the volume control hit the 10 o'clock position (I still own a 430, and bought my father a 730, which my brother absconded with). Yamaha and McIntosh had variable loudness controls, those two were different. The APT preamp had a bass control with a turn-over switch designed for loudness use, it sounded quite good in that function.

" can I put the old HII diaphragms into the kg tweeter? " Yes.

Is John Fricks still with the living?

Most die from mechanical issues on the lead-out wires, rubbing, or similar. I suspect your ears would bleed before you actually burned out the voice-coil in home use.

I didn't (it was just an experiment). I would if it was for long-term. It sounded better than you would think, as the Cornwall HF is down about 3dB anyway, and the combo picked up about 6dB of bass below 100hz.

A pair of Cornwalls parked right in front of the Klipschorns, wired in parallel, have un-real bass, better than either by themselves. A wicked amplifier load though.

+1 on the comments of lack of dynamic range and fatigue. I still own a DBX 3bx, makes most CD's listenable.

Replace the input jacks.

"Do you sell replacements that can handle this" A large format JBL compression driver with a 4" voice-coil is rated to handle 75W long term average power, so the answer would have to be NO. A friend slagged his Yamaha 4115's in one evening with a Hafler DH500 on them, only 250W/8Ω per channel. The glue holding the voice-coil former on the aluminum dome melted, the coil slid off to the side, the L-pad burned up, and the fiberglass insulation behind the network caught on fire.

"Mixing autotransformers and Lpads a bad idea, really." So, the Chorus II and the KLF-30 with their high value series resistors are bad?

"Wouldn't running an amp into distortion cause over-heating quickly for a voice coil?" No, that was the point of my post. When you drive an amp 10dB into clipping on good dynamic program material, 90% of the time it is not clipping, so the 10dB increase in power during the non-clipped portion of the program is what is heating up the voice-coil. The difference in power between an un-clipped sine wave at full power and a clipped full square wave is only 3dB. Rane has a good app note on this if you care to read it. http://www.adx.co.nz/techinfo/audio/note128.pdf

Of course, repeating a non-truth many many times makes it true? Clipping is not what takes out tweeters, excessive long term power is what takes out tweeters (and/or too low of a crossover point, and/or too shallow of a crossover slope). Driving a small amp into clipping generally takes out a tweeter from the excessive long term power during the non-clipped portion of the program material. Poorly designed amplifiers can have off-set problems during clipping, leading to excessive cone motion (on woofers) and mechanical damage. Some pro amps have loudspeaker off-set integrators to prevent this problem.

". Listen to the amp and if it sounds OK offer $750 for it." Sure, if it has just been overhauled. A non-restored MC2105 recently sold for $399 on eBay.

"50 Hz equipment may work on 60Hz power but the power transformer will run warmer, or even hot. " Backwards, 60 Hz equipment may work on 50Hz power but the power transformer will run warmer, or even hot.