JohnA

Deoxit D5 is a very good contact cleaner. The maker is Caig Labs. John

I did emphasize output exclusively, but I did it because it is an easy concept to explain. Low distortion comes from lack of strain (engineering definition) while reproducing a particular sound. A system capable of La Scala output should not be under much strain at typical levels. Since the highs are filtered out of subwoofers, I'm not convinced "quick" even applies to a sub. A waveform with a steep rise and fall has lots of high frequencies in it to create that steep (quick) slope. A sub will never receive the highs that make the sound seem "quick". Distortion is another matter. I chose my subs because they looked capable of the required efficiency and low distortion. If the Manufacturer's specs are to be believed, and he's not hiding anything in them, they do the trick, at least in the distortion department. John

The Cornwall has very large impedance variations. It has a 4 ohm woofer and the midrange gets up to about 64 ohms or so. If you're concerned with the impedance curve and it's effect on an SET amp, the Cornwall must be almost as extreme as it gets. John

The No Sub setting on the Acurus ACT-3 sends LFE to all 5 speakers, but since it is a mono track, I wouldn't think that would help much. John

The T2A is an autoformer (transformer) that is used to reduce the output of the squawker and tweeter in a Heresy. The tweeter's efficiency is 104 to 105 dB@ 1 watt and the K-55-V squawker is 107 dB@ 1 watt. The autoformer drops the voltage at the driver's terminals to make their output match the woofer's. A side effect is the squawker and tweeter appear to the amplifier to have very high impedance. John

The notch I saw was not THAT deep. It was 5 or 6 dB max. I don't remember a suggested sweet spot at the rear wall. John

I still don't understand, Ed. If you want low bass coming from 5 directions, that's what DD & DTS do now. If you have a room with standing waves, treat the room. My Acurus Pre/Pro seems to be able to direct low bass and LFE to a sub or 2 (or more?) that *could* be optimally placed in any room. It seems everything you want is here, except main speakers that can actually operate from 5 Hz to 20 kHz. I run my 4 La Scalas full range, cross the center to the subs at 60 Hz and have the LFE channel set to SUB & LFE with a 60 Hz low pass. As I understand it, all 5 channels are blended into the SUB signal below 60 Hz and that plus the LFE goes to both subs. In addition, the center has a 60 Hz high pass filter on it. Is this not what you are asking for? John

There are lots of good subs out there. The coming Klipsch RSW-15 has an MSRP of $1700 and I believe it will do the job. I spent an afternoon listening to it play The Matrix and it can ROCK. HSU makes a pretty good linr of subs that are similar in design to SVS. I've heard HSUs and they are nice at normal listening levels. The Earthquake sub may be enough, be sure to check max. output levels on whatever sub you buy. All decent subs can play with La Scalas up to a point. when they max out you'll have to turn them down if you keep turning the La Scalas up. John John

I don't think I follow your logic. The DD and DTS standard is 5 full range channels (5 to 20k Hz) and a Low Frequency Effects channel; no "sub channel" at all. That may require six subwoofers to actually implement. Sending low bass from other channels to the LFE speaker is NOT part of the plan. That said my Pre/Pro can route low bass from any of the 5 channels to the LFE speakers and set the level of the LFE and each speaker individually for each Mode (Stereo, ProLogic, DTS, & DD). The LFE can be LFE, Sub or Both. As best as I can remember, the crossover frequency is the same for each Mode. It looks like what you want may be out there, but not in a receiver. John

The K-77-M is nominally 8 ohms. They will measure about 6 ohms DC resistance. John

That 50 to 80 Hz notch is a characteristic if the K-horn. You may not be able to eliminate it. I have seen it in at least 2 graphs of the K-horn's response, but it was not in the 3rd. John

I did quite well with just one sub and a 350 watt monobloc at normal listen levels. It's when you want to crank a little Collective Soul, that you need 2 subs and lots of power. John

I believe Klipsch DID, at one time, own Pyle. I'm not sure they still do. The woofer supply for the Heritage line is not in question, at this time, it's the squawker driver and perhaps the tweeter. John

Based on my experience with my La Scalas (@ 104 dB/watt/meter), one subwoofer from anybody a small as a K-horn, or smaller will not be capable of the output required to keep pace with K-horns/Belles/La Scalas. I could not find a maximum output on REL's website, so I can't be too sure how many Studio IIs (the biggest ones) it would take to hit 124 dB at 20 Hz, but it'll take more than one since it's power amp only puts out 300 watts. Unless, of course, the system efficiency is an astounding 100 dB/W/M. At 450 WPC, sitting in corners, and 93 dB/W/M, two VMPS Larger Subwoofers can barely do it. John

I mounted my ALKs to the left of the squawker brace, like the factory crossovers. The clipped corner is close to the brace and the whole thing is a little deeper that the original. I had to make new holes in the cabinet for the screws, but that was no big deal. Wow! is clearly applicable here. John

Are you sure the first 3 in not an S. Look on the edge of the cabinet near the crossover to see if it isn't stamped into the wood, too. If it is an S they are from 1977. John

i don't think you have anything hooked up wrong. If the Yamaha is set to LFE you will only get sound from the sub when a DVD has a signal in the LFE channel. The rest of the time, nada. If you can tell your system has a sub in it the sub is TOO LOUD. If the Yamaha is controlling the crossover to the sub, set the sub to it's highest frequency (120?) so there's no interference from each crossover. Try to set the LFE out on the Yamaha to LFE & Sub; if it has that setting that will help. Adjust the LFE out level on the Yamaha higher and turn up the sub's volume. too. However, stop turning up when you sense a "floor" to the music. A sub is to add deep frequencies that often don't exist in most music, not to add "Boom". Boom occurs at 100 Hz or so, too high for a sub. Even with La Scalas, I have my subs set to 60 Hz. John

Hey Al, Ya got a home for all 8 of those? I have a pair of K-55-Ms I'd sell/trade. John

Wired1, I don't think there's anything wrong with REL subs, just that one won't have enough output to match a pair of La Scalas; maybe 2 or 4 would. The Home Jubilee will be a 2-way system where the Pro Jubilee is a 3-way system, probably for power handling. The home version will use the pro tweeter (on a different horn) over a wider bandwidth. The bass horn will be very similar to the pro version, but with a modification that appears intended to increase deep bass response. They are massive and quite handsome in mahogany. Powerful just begins to describe the sound. My ears will never be the same after hearing "The Matrix".

The Type A was used on early K-horns and maybe Belles and La Scalas. I doubt it should be in your Cornwall. The other possibility is that Cornwall in much older than 1980. John

Great pictures! Didn't the We 555 have 4 or 5 paths through the phase plug? How does the phase plug do whatever it does? John

The correct spelling is Blose! Lots of people like them, but just set the EQ controls to "flat" and see how lousy they sound. As a rule, Blose puts the least $ content in their speakers for every $ of MSRP of any speaker manufacturer, or so I've been told. They sure sound like it to me. I wouldn't accept them as a prize in a contest. John

Everybody can generate an arguement for the best configuration of drivers and crossover. I'd love to listen to a pair of Carfrae horns for a long while. The look is superb. My preference is a 2-way design for it's overall simplicity and especially the simpler crossover it *could* have. Since a 2-way La Scala is either not possible, or the tweeter would be stunningly expensive, I have 3-way speakers and am happy. John

There is, of course, no best amplifier. I doubt you need more power, either. To get the sweeter, warmer sound you want look at MOSFET amps. The Parasound HCA-1500A is rated at 205 watts x 2. B&K Components makes all of their amps with MOSFETS; the ST2140 is 140w x 2 and MAY slide under $1000. B&K' ST60 is a 60 wpc stereo MOSFET amp that will be plenty of power for your RF-3s. Mondial Designs makes several good amps and some are tube/SS hybrids, you'll have to inquire about prices. What I need is a good 20 watt Class A HT amp! John

111 dB, A sub is required for 5.1. With most electronics you can set the .1 (LFE) output to subwoofer or LFE only. With LFE only, the sub will get only the special effects and will not interfer with your Fortes. The problem with this is on some movies the LFE signal is infrequent enough the sub will automatically power down. John