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RF-7 SOUND MODS


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I cant help but notice all the stuff about people applying sound deadener material to the RF-7. I watched a video on youtube as well about it. The guy on youtube used 4mm Bitumex which for the life of me I cant find in the U.S. I guess my question is how much does this improve performance and what could I use in place of that Bitumex? I thought about some spray on stuff but getting the same thickness on all sides could be difficult. Thanks!

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Dynamat?

That's the first thing I thought of I just wasn't sure how it compared to this Bitumex that I keep reading about. That and I was not sure how important thickness of the material was.

Edited by philly0116
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Dynamat for the horns is much more effective than rope caulk or duct seal. Bitumen would be useful on panels but eats up a lot of volume I would much rather brace and stiffen to push up panel resonance well oup of the drivers bandpass so then there is zero issue and nothing to have to dam past the cabinet volume. Best regards Moray James.

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The RF-7 requires a network modification to reduce the ringing from the woofers.

A common problem here: people get used to something in the sound that doesn't belong, and either grow used to it and do nothing, or it makes them crazy - and they begin chasing and implementing various solutions to fix the problem. Thankfully in this case, we know what the problem is and how to fix it. Replacing the epoxy coated oval capacitors in series with the horn, as well as the resistors, makes a significant positive impact as well.

Edited by DeanG
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I used gutter seal on my horns it comes in roll form from menards. It's tar and is about an 1/8" thick by 4" wide has white platic on one side and is sticky on the other. cut, peel, and stick. I put 2 layers on my horns. As for my woofers I used 1" wide by 1/4" thick foam seal, It also comes in roll form from menards, cut chunks and affix to the inside spokes of the woofer baskets, then peel off the paper on the other side of the foam once you've stuck it on.. cover the entire inside of the spokes with it but don't block the basket holes at all. It really made a difference for the better on my KLF 30's.

Edited by cradeldorf
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On 6/9/2014 at 12:07 PM, CECAA850 said:

I'd think that anything that would deaden the horn would work. Some say the mod does nothing, others swear by it.

I used clear pure Silicon seal on mine, about 12 oz per driver. There is no question that it deadens the wave guide, according to my yet-to-be-verifed but highly acclaimed "knuckle rap test." :rolleyes: I would say it lowers the pitch about 1/3 of an octave.

In my highly subjective yet 98.4% accurate "listening test" listening to music, I could not hear any difference at all between my modded tweeter and the stock unit.

post-58280-0-09360000-1402492289_thumb.j

There is a yellow sticker on the end of the horn's CD which says "63." FYI the compression driver on the left is a DNA-360 and is attached to a 12" SEOS waveguide.

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It's really easy. Just hot glue the resistor to the board next to the existing resistor, wrap the leads around the edge of the board and put a dot of solder to parallel them with the neighboring resistor.

Pardon my ignorance but I would need to buy another resistor?

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It's really easy. Just hot glue the resistor to the board next to the existing resistor, wrap the leads around the edge of the board and put a dot of solder to parallel them with the neighboring resistor.

Pardon my ignorance but I would need to buy another resistor?

The only bad question is the one you don't ask.

You'll need one of THESE per speaker.

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It's really easy. Just hot glue the resistor to the board next to the existing resistor, wrap the leads around the edge of the board and put a dot of solder to parallel them with the neighboring resistor.

Pardon my ignorance but I would need to buy another resistor?

The only bad question is the one you don't ask.

You'll need one of THESE per speaker.

I have always liked good sound and have never dabbled in the technical aspect of the hobby....what exactly will these resistors do for the speaker?

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Gotcha. So it will help reduce the brightness and shrillness of the horn.

Correct. It's an amazing little mod that I can take absolutely no credit for. The information was provided to me by Dean, he credited someone else for trying several different resistors until they came up with the correct value. I don't recall who he said did the leg work though.

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