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Well, since you asked, it is a Yamaha Receiver, and the feature many Yamaha Receivers have is a remotely controlled Parametic Equalizer, that operates in the digital domain, so it is free of a lot of the bullshit inherent in an Analog Equalizer. The particular Yamaha Receiver I have is an older Yamaha TSR 7810. I remember sitting next to Mark Levinson at the Space Needle in Seattle back in 1981, we were all at Dinner. I asked Mark Levinson what was the ultimate speaker you could walk in a dealer and buy, and he shocked the hell out of all of us when he said "Klipschorns, but only if they are equalized". I know I will never be w/o a Parametric Equalizer again!

I own several pairs of speakers Duke, including Eminent Technology LFT VIII, Apogee Duetta Signatures, Magnepan 1.6, Altec Malibu 's, and some huge Kindel Audio PLS 1 Speakers, some Tannoy's and my current darlings, these monster horns. I will post some pics of them. The big Kindel PLS 1 are not especially revealing, except for their imaging, that can be Holographic. However, most of my other speakers are quite revealing, allowing me to hear differences in equipment. The big Horns I have hooked up currently are the first ones from left, next are the white vintage pair of Altec Malibu's, Next are the Black Kindel PLS Line Sources, and finally my Eminent Technology LFT VIII on the right. The Apogee Duetta Signatures are the very last picture.

I do have the ability to measure ESR, either in or out of circuit, and Bob Crites is correct. Mylar Caps can develop higher then when they were stock ESR values. But I have yet to measure any Mylar Cap that did not have it's value, as far as capacitance goes. In fact, the people who rebuild old radios seldom if ever replace any Mylar Caps, But ESR is seldom a problem for them as long as the cap has kept the other value. I am re doing the crossover in these horns, and they have 30 year old Mylar caps in them. I measure them, and they have kept their values, but ESR is higher then I would like. They take a 17UF Cap, kind of an odd value. So I found some AC Fan Poly Caps for them! These are sort of like the motor run caps, but smaller and are 450 VAC at 5% Tolerance!

I have had literally every kind and type of high end 2 channel preamps in my 45 year audiophile career. Now, I use a receiver with pre amp outputs! I have actually A/B this receiver with several high end 2 ch preamps with XLR's. I fail to hear ANY differences between RCA Cables and XLR. I hear absolutely little if any difference between this receiver, and high end solid state preamps. Yes, there is a difference between the solid state receiver and my Tube Preamp, but that is because Tubes in general have a different sound than solid state! I also have some stand alone DAC's, and also fail to hear any difference with the Burr Brown Dac's in this receiver. The preamp outs on this receiver will easily drive ANY of my 11 different amplifiers, so much so that I had to actually go into the level settings of my little Ayima Class D Amp, and turn the level down because this receiver was actually overdriving it! There is a reason WHY this receiver, is my favorite, want to know what it is ? And, I am sure many of you will want to know WHAT receiver it is too ? I will give you a clue! Most of this company's receiver has this feature, and never again will I be w/o it! In fact, I would not even CONSIDER buying a receiver, or any component w/o it! LOL, and no, it sure as hell is not Audyssey

A Poly Capacitor is the very lowest loss capacitor. Inherently, they have lower ESR than a Mylar, so I think that is what you heard. Usually, Mylar Capacitors keep their VALUE forever. But, according to Bob Crites, they can develop high ESR as they get old. Those electrolytic capacitors are on the woofer roll off circuit, and if they lose value, the woofer will not roll off as soon. In a 2 way speaker like the Academy Center Channel, those dual 8 inch woofers are crossed over at 2.2 k. This means they are the midranges!

Thanks for the picture of the Academy stock network! Because of the 2 old electrolytic caps, it needs a cap replacement. As these old electrolytic capacitors age, they change value by losing capacitance. This causes the woofers to play too far up in the midrange, causing that muddy sound.

My Academy is left over from my Forte/Cornwall days.; I have not played it in nearly 12 years! It will do center channel duties for my newest pair of speakers. The KLF C7 is 3db more efficient than the 96db Academy, and has a larger horn. I will use the Academy right now, but will keep an eye out for a KLF C7 to keep up with these monsters

LOL, every old thread is new again. When I reply to a post, I am not necessarily replying to the poster, but adding to the knowledge base The Klipsch Academy Center Speaker was only made from 1992 to 1994 https://www.klipsch.com/products/academy-center-speaker

Does anyone have an Academy Center Channel Schematic, or better yet a picture of the crossover ? I wonder IF they used electrolytic capacitors in it, or Mylar ? Old electrolytic capacitors would explain the muddy sound someone on this thread remarked about.

Thanks!

Thanks! Yes, the center channel will be for HT, and a have a digital parametric equalizer in case it is not a close match to the left and right speakers.

If there are electrolytics in there, they should be replaced. Think about it ? If a speaker was made in 1990 the caps are 32 years old! 32 years in no problem for a Mylar Film Cap, but not so with an electrolytic Cap! They lose value, and as a result no longer have enough capacitance to keep the LF out of the midrange!

LOL, a whole LOT of older speakers, could stand a capacitor refresh. I have been playing with, and refreshing speakers for many years. This is my experience. A Bipolar Electrolytic Capacitor is always the most mellow sounding. A Mylar is in the middle sonically, and a Polyproplyne is the brightest of the 3 Capacitors. It all has to do with ESR. The Bipolar Electrolytic Caps almost always have the highest ESR, so they are the most mellow, unless you go to a Paper In Oil Capacitor. Some of them have very very high ESR values, so they are even more mellow than a Bipolar Electrolytic Cap. I have compared very very expensive Capacitors with the same type of inexpensive Caps, and guess what ? I found no difference. None. However, I can hear a difference between different TYPE of Capacitors. I happen to have an old Academy Center Channel Speaker that I have not used in over 12 years, since I sold my Cornwalls. I plan to use it with my newest speakers that are not quite up and running yet. It is the most efficient center channel I own at this moment, and it will need all it's efficiency to keep up with these Monsters

I agree with mikebse2a3 about the imaging of Horns. I have corner mounted Horns, firing across the room. I do have plenty of room treatment installed as suggested for corner firing Horns. I get an image that stretches from corner to corner with decent depth, and sometimes images seeming to come from outside the room boundaries! Placement is precise, and the entire sound field is large enough to imagine a band being right in the room with you. I have a TON of other speakers, including Magnepan 1.6, Apogee Duetta Signatures, Tannoy Concentric Monitors, Altec Malibu, and several others as well. I always wind up going back to my corner mounted Horns, and no, they are not Klipschorns or Jubilee's.

Never, but I have seen many other Detroit area music acts, including Ted Nugent, Alice Cooper, Bob Seeger, Suzy Quattro, The Romantics, Kid Rock and Eminem, and of couse most Motown Acts. Ted Nugent said he does not do Drugs, and never has, but that is total Bullshit.

Randy "The Macho Man" Savage was from right here in Bradenton Florida. He is dead now, but back in my going to the Gym Days, several of us would try to mimic The Macho Man, LOL I left the Detroit area in 1971, but remember some great times in the Metro Detroit Area!

LOL, BoBo Brazil, born and raised in Benton Harlem, Michigan! Of course, I meant Benton Harbor. I have many fond memories of Cobo Hall, especially all the concerts. Here is another video from this butthole saying it is "Generally Accepted" that Horn Speakers just don't sound as good as other speakers, and that is why we do not see more of them.

I agree! I am not at all interested in anything they sell.

I thought I would post one of his videos, in case anyone hasn't seen them.

I met PWK at Cobo Hall, at a Detroit Audio Show! Him and his employees had these buttons on that said "Bullshit" on them. I think it was either 1969 or 1970, and a bunch of us Kids were bored, so we decided to take the Woodward Ave Bus downtown. We did not plan on going to the Detroit Audio Show, we just kind of wound up there at Cobo Hall. I remember PWK as a nice man that was very pleased when I told him that My Grandpa owned Klipschorns. Bob Carver was also at that show with his Phase Linear Andromeda Speakers, and Phase Linear 700 Amplifier. I greatly dislike this Paul McGowan guy, and find I generally disagree with him on a lot of things.

Looks Great! Back in the early 80's, I lived out in Seattle. My best friend Mark was a part owned in Definitive Audio. They were Levinson dealers. Mark Levinson came to town, and we all went to eat at the Space Needle. I asked Mark Levinson what was the ultimate speaker. To my very great surprise, he said "Klipschorns"! This shocked me, and he added that you need to turn the tweeters vertical, and get them out of the cabinets, and you needed to give them some EQ with his Cello Audio Pallett Equalizer. I very much believe in Equalization, if it is done correctly. The 2 curved diffusors I have came as part of a deal, and I have not really gotten around to using them, but I intend to, eventually.

This is the amp I am using, and it is absolutely amazing. It beats my 2 tube amplifiers, and 8 of my Solid State ones too, seriously! It is dead nuts quiet, important to me since my speakers are very efficient. These things are dirt cheap too, well under 100 dollars! https://www.audiosciencereview.com/forum/index.php?threads/aiyima-a07-tpa3255-review-amplifier.18984/

I sold my Klipschorns, but I still have very large horn speakers in the corners "Klipschorn Style". Of course, the speakers fire across the room. I know with a conventional pair of speakers NOT in the room corners, we try to hang the acoustic panels at the first reflection points. But, with speakers firing from the corners, where shall I hang the panels ?