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Using this for inside Speaker walls for damping

It is a ported speaker and I'm almost done building the boxes and bracing. For now I'll use the 1 inch foam that I believe was stock from Klipsch behind all drivers except
bottom woofer as I found it when opened up. I did find a wool army blanket at an estate sale I will line the walls with on one and compare. Thanks automojo, interesting reading.
 
Sure-I had some KG 5.5 years ago-they had a foam piece-1 inch behind the woofers.
Overall the bass was fine-as good as you will get with poly woofers, so I would say Klipsch did fine with the damping. The cabs could have used bracing-but I never heard anything in congestion etc in midbass-very clean sounding, and far from boomy-just not the detail of a paper cone woofer.
 
I have also found the BXI 6x6x2 rubber cork isolation pads @ Amazon work extremely well at cleaning up the bass. I use 4 per speaker with my AMT3's. Best I have found-that really work, and are reasonably priced.
A wood floor can really cause some bass issue with a full size large woofer speaker.
I see a Klipsch representative recommended them in the latest Stereophile issue when they were reviewing the Klipsch Forte III.
 
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I was going to say, Klipsch probably knew what they were doing, so use whatever they used. Unless you find a specific recommendation for a specific material for that speaker that had a demonstrated improvement.

Polyfil, I think, is not all the same. Someone around here tested a bunch of it and there was a good thread on the damping properties of polyester fiberfill.
 
automojo said:
I have also found the BXI 6x6x2 rubber cork isolation pads @ Amazon work extremely well at cleaning up the bass. I use 4 per speaker with my AMT3's. Best I have found-that really work, and are reasonably priced.
A wood floor can really cause some bass issue with a full size large woofer speaker.
I see a Klipsch representative recommended them in the latest Stereophile issue when they were reviewing the Klipsch Forte III.
Click to expand...

I'm on a carpeted floor for now and found some spikes at Parts Express. I'm using them at an American legion hall Saturday for a friends party. Not sure if I'll use the spikes as normally
I put the speakers on top of a folding table. Everyone's invited!
 
zeprok123 said:
I'm on a carpeted floor for now and found some spikes at Parts Express. I'm using them at an American legion hall Saturday for a friends party. Not sure if I'll use the spikes as normally
I put the speakers on top of a folding table. Everyone's invited!
Click to expand...
Ha!
Well, the isolation pads are for isolating the speakers from the floor-spikes couple it.
My AMT3's are on a wood floor-the left speaker in a corner-so tuning the bass has been a challenge since I moved in last years. These do the job perfectly.
 
I'm always interested in something that takes it to another level. This project has gone way over budget. Feel like I'm always in a check out line for something.
Had to google AMT's. Very nice!
 
toxcrusadr said:
I was going to say, Klipsch probably knew what they were doing, so use whatever they used. Unless you find a specific recommendation for a specific material for that speaker that had a demonstrated improvement.

Polyfil, I think, is not all the same. Someone around here tested a bunch of it and there was a good thread on the damping properties of polyester fiberfill.
Click to expand...
Yes-Dickasons tables pretty much spells it out. These are basically for speaker building, or in my case with the AMT3's-using non stock woofers. But there is no harm in experimenting and having fun.
Klipsch seem to always take cabinet resonances into account. Many times it's simply placement, or room coupling when it comes to bass, and off the shelf manufactured speakers.
The reintroduction of the Forte (III), and how they have dealt with the draw back of horn drivers is impressive. I haven't heard them, but I bet they sound great when tuned to your room.
My main issue with horns was the beaming effect-and they have seemed to have reduced this, and enhanced the sound stage.
I have heard a ton of Forte's over the years-and always appreciated them in a big room(s).
 
zeprok123 said:
I'm always interested in something that takes it to another level. This project has gone way over budget. Feel like I'm always in a check out line for something.
Had to google AMT's. Very nice!
Click to expand...
Ha-talk about over budget!!
I could have bought several pairs of nice new speakers, for the money I spent over the years trying different combinations of drivers in my AMT3's. It's a hobby-so it is what it is.
They have a sound of there own-detailed but rarely fatiguing, even when being transparent with crappy source material.
Unlike my KG 5'5, and Quartets, that were very unforgiving-and hard to listen to-the Heil can smooth things out-probably mainly because of the better dispersion/air-thats why the new Klipsch designed dimpled horns are intriguing to me.
Might have to save my penny's...….
 
Interesting I see the KLF20's had the same issues some KG 5.5's had. Mine never had that issue-bought new. I traded them for my other set of AMT3's Midwest Speaker In Roseville MN had. I think I paid around 900 for them new.
They certainly rocked, but I was missing the Heils I had in the 80's.
I certainly could live with the 5.5's, or Quartet's over a lot of other speaker. The AMT3's are in a class itself.
 
I use those BXI isolators under my modded AMT3's. They are on a wood floor-along with moving them 12" from the wall the bass is perfect, and the whole speaker has snapped into focus-from top to bottom.
It's amazing when you finally get your speaker really tuned to your listening room, it's like YEAH!!!
Been basically a year long process, sad to say.
The BXI's were a god send, so tp speak.
Along with foamed lined walls, included the rear, 2 added baffle braces, and internal ceramic coating-each speaker has 4 lbs of r-19 fiberglass in pillow cases.
It address a 2 fold issue. Tames the resonance impedance peak of the 1040SF due to the AMT3 cab being slightly smaller then ideal (2.7 vs 3.01-3.3 cu ft)- Qtc .707-.68, and also tames the resonant AMT3's cabs-something it took me awhile to realize I was dealing with 2 equally 'important' issues.
Poly fill just doesn't cut it.
The end result is amazing-fast clean, superior transient response bass that keeps up with the Great Heil, detail and level wise. A lot of work-too much probably.
It's really too bad ESS didn't, or still doesn't stick with sealed bass-as there are ways of compensating for the decrease in efficiency. Dual 10" woofers help-automatic 3db increase-but there are other ways obviously.
I've just never heard a BR alignment passive, or ported that has the same superior response, and "touch" a sealed cab has.
Efficiency is a good thing, but detail IMHO is more important vs a few db.
 
AMT3 Recap Crossover.JPG AMT3 Super Auto Crossover.jpg Eminence 1040SF Woofer.jpg AMT#1040SF.JPG Would not surprise me! If they were L100's-they defiantly sound better stoned. When sober, eh...
Don't get the new L100 enthusiasm.
If I were out to spend that kind of cash for new-I'd look at the Forte iii's-if you have the room. They can through out some big wide sound.
Or just buy vintage-instead of 'new' vintage-and do your own upgrades....
 
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Nice!
My KG 5.5's had the 1" foam piece behind the woofers-not the tweeter. Can't imagine why they would have it behind a close back driver like a horn. The foam is used to absorb the higher frequencies emanating form the rear of the cone so they don't bounce around and exit the port. It also probably helps with cabinet resonance.
The KG 5.5's had resonant cabinets as well-but IMHO Klipsch took this into account-because the few thing I tried(no braces) killed the bass.
 
automojo said:
Nice!
My KG 5.5's had the 1" foam piece behind the woofers-not the tweeter. Can't imagine why they would have it behind a close back driver like a horn. The foam is used to absorb the higher frequencies emanating form the rear of the cone so they don't bounce around and exit the port. It also probably helps with cabinet resonance.
The KG 5.5's had resonant cabinets as well-but IMHO Klipsch took this into account-because the few thing I tried(no braces) killed the bass.
Click to expand...

You've got me looking up AMT speakers now and see some ESS AMT 1-D SPEAKERS for 900 bucks. It would be a 4 hr drive for me. Wonder if they'd meet half way, lol.
 
Hmmm, 900 bucks. That's not a terrible price, but its not a great price either. However, for that price, I would expect complete and fully functioning speakers. Grills, logo badges, OEM drivers with intact surrounds and passives that are intact. functioning Heils. Cabinets without too many cosmetic defects. Deviations from this and the price goes down.
 
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