consistent
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Posts posted by consistent
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UPDATE
I have been fooling around with various xover networks and have found, to my ears at least, that a 2nd order Bessel with a Zobel across the woofer works best, if fact it opens up the AMT and helps it blend better with the woofer (Crites woofer). Still you may need to move the AMT around the top of the Corn box to get the best alignment for you room. It is an amazing combination
all the best
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Hi
I had Bob's APT -50 (125) and the 120 (DE-120), comparing these to the K-77 they are both superior but the DE-120 wins my vote because it is cleaner and more Klipsch like (fast and hot)
cheers
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Added the AMT to the Corn box (Crites 15" woofer) with about 3 db of attenuation and it sings. The AMT is beginning to relax and find itself. Certainly a great tweak for the Cornwall, you simply don't need a mid and a tweet when you have the AMT, it is very much a 'horn'!
all the best
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Well my AMT-I's arrived and I have put some ends on the cables and hooked up to a refurbished upside down bass bin (sans sound dynamics 12" woofer) using Chris A's 1st Order cross but with 1.59mH for 8 ohm 12" woofer. Thanks Chris and others for some very informative posts. Will try the Corn bin at the weekend with the smaller 1.15 coil. I did try a 2nd order but I think a waste of time/money, the 1st order works fine.
My room is small 4m x 5m with a bus load of room treatments but still the AMT is finicky to get right. What currently works is about 2m from rear wall and 1m from the sides, slightly towed in. It sits on the woofer box about half way but it's amazing how the sound changes by putting it at the front or the very rear of the box (front to back of box is 30cm). very room sensitive. Reminds me of the Martin Logan Montis I had for a few years. Scary as it sounds, I think the AMT-1 with my woofer competes well against the Montis and I would say the AMT combo is certainly more lively! The woofer doesn't go as low as the Corn but it keeps up with the speed of the AMT.
I also found that AMT-1 snaps into life when the purple wire is used as the +. It may be that the woofer is wired wrong but when I use the blue wire (from AMT-1) the sound becomes dull.
Anyhow stay tuned
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Hi Jwgorman. I see that many have used at notch filter to rid them of the 'bump' between 3k and 5k and others have crossed over at the 'bump' in a 3-way network
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Thanks for the tips Claude and I agree, voicing the integration will take time and I have a number of approaches including bi-amping, autoformers, l-pads but I like playing in this space, keeps me off the street. However I would have thought that the rating of the AMT is pretty close to the Cornwall bass bin and that my hearing would not notice much of a difference. I would think that the psychoacoustic interplay will take up more of my time.
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Some great reading here guys thank you. I too have just ordered some ESS HAMT (great one) and will want to passively mate in a two-way with my Crites 15" woofer box I have made
(currently used in a 3 way with Altec 291 and Crites DE120 with my own crossover network that sings with this eclectic mix of drivers). I read that the ESS works better in a second order config. So I was thinking that for the woofer use 1.6mH (1st order) and for the ESS: 24.88uF and 1.6mH (2nd). I would obviously need to skirt around these values to fine tune and am also able to move the ESS around on top of the woofer box for better alignment. My room also has significant treatment that can be moved around taming nodal interference. My wife of course never enters the room!
Your thoughts would be much appreciated
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Not sure if anyone has seen this article
https://www.bbc.co.uk/rd/publications/rdreport_1992_10
It makes for some interesting reading on their discoveries on what makes a true low-end bass trap
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I have used the 125's and now the 120's which are a superior in clarity to the 125's
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Hi
There is much better tweeters about than the 77 but try it in the vertical position. You will find it cleaner and of course more focused. I think it was originally built by Electrovoice to stand in the vertical
cheers
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There was a mod presented on this forum you could do to the LS by extending and porting on its bottom, perhaps this technique may also be applied to the Belle...not sure how it would look though? I believe it got the LS down to 35hz in the right room
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Hi
I have owned Heresy, Cornwall, LS, Forte II and KHorn and can say without question as USNRET states, the room will have the biggest impact on whatever you will drive in it! I have spent a ton of time and money on changing rooms to be more acoustically stable. Second by a nose is the crossover, once Klipsch decided to use second and third order networks, their speakers began to sing much better. I have just spend 3 months re-designing a Cornwall and a network to suit. I can say without question you can get much more detail with any Klipsch speaker by tweaking the x-over to suit room and taste. On the price you are looking at to pay, way too much in my book. See if you can find another pair and keep some money aside to upgrade network and horns if you can - you will be amazed at what you can do. Whatever you decide have fun and enjoy
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Hi there
If you want to have some fun and have the time I would mod the Cornwalls. I have built my own using the Roger Floth method (Equalising the Cornwall) to create a better bass response, you can do that quite easily. Then, as others have stated, found a much better mid range and horn configuration. I originally used Bob Crites Cornscala parts and have now built my own crossovers. Taken me a few months but what I have achieved is short of amazing. I have owned Heresy, Forte II, Cornwall and Khorn (AK-4) but I think these things I have built are better than all of these and I have had fun learning.
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Looks like a 1st order Buttwerworth...no Autoformer?
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Hi
I have used a number of Pass amps and have a J2, very fast, clean, warm yet detailed, a great amp for highly efficient speakers!
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Thanks and yes I have been through this site numerous times, good value but still some things I just don't catch?
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Gents I am trying to learn more about the use of caps and chokes on their own and in combination. I read a lot but it just confuses me more. For example I see caps used in line (series) to a woofer but then used across the + and - terminals (parallel). I have attached a simple example to gain an understanding of what these types a cap and choke do in these circuits to a signal put through to a wooferSimple Circuit.pdf and how the resistance is seen by the amp. Assume the woofer is 4 ohms with a sensitivity of 94db @ 2.83v and please forgive my artistic skill and 'numbness' to electronic circuitry!
thanks again
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thanks guys, so in part it is technical as well as subjective ( to the designers ears)
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Hi All
There have been a few networks for Cornwalls over the years which all use autoformers and a cap of varying values. What does the cap do in these circuits and why vary it by a few uFs?
thanks
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many thanks
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bump
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Yeah, I agree Pzannucci, that's what tuning with Floth method does: bass is tighter, faster and copes better with transients
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Hi
I followed Bob Crite's build of a square box but I used the Roger Floth approach and extended the ports (article somewhere around here). The box gets down to about 28hz with a 'deeper punch' better than with the standard porting. All other drivers sit on top of the box. I used Bob's woofer, crossover and DE tweet but am using the Altec 291 (L-padded) with a Le Cleac'h horn - amazing detailed/tight/extended combination.
all the best
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Hi All
Just wondering if anyone out there has a response plot of the K33 (Eminence) woofer...like to know how far it can go out to its natural roll off and the impedance to frequency as it does. I am also guessing the Bob Crites woofer would be similar
cheers
Heil Air motion transformer for Cornwalls
in Technical/Restorations
Posted
you can go with a LWR @ 800 (+/- 100hz) but to me in my room the Bessel is a good fit. BTW I am using the same clarity caps and the coil...scary!!