What are the D9 mods?

Northwinds

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#1
I should have a pair tonight... I heard the horn tweeter can be a little harsh so I was wondering what folks do to mod for better sound. I know Jer has a modded set, figured others do also since these seem like popular speakers for high wattage amps like the WOPL's

This is the pair I am picking up this evening. They only saw studio type use, seller said he used Crown amps on each one



 

laatsch55

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#3
D9s won't start the migration but they will accelerate the migration once started..
.
 

Northwinds

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#4
Yep, these things thunder, I am having a blast session right now :toothy5:. I dig them!
 

Gibsonian

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#5
I did a few things to mine prior to parting with them (not my wish!)

1. Braced inside of cabinet. There is one brace in all of cabinet and is a hot glued small brace from front to back. Most that have been cranked to any degree have the hot melt already separated. I braced it pretty good without consuming too much volume. I added a bit of open cell foam to try to compensate.

2. Covered the entire wooden interior with a coat of latex rubber to deaden the cabinet.

3. Recapped the crossover.

4. Added some sand bags inside to increase mass.

4. Of course I had to refoam woofers and replace tweeters (blown from under powering, prior owner), but that is all just maintenance.

Sound was improved from stock when done. Tighter bass, and a bit smoother sounding mids and highs.
 

Northwinds

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#6
I did a few things to mine prior to parting with them (not my wish!)

1. Braced inside of cabinet. There is one brace in all of cabinet and is a hot glued small brace from front to back. Most that have been cranked to any degree have the hot melt already separated. I braced it pretty good without consuming too much volume. I added a bit of open cell foam to try to compensate.

2. Covered the entire wooden interior with a coat of latex rubber to deaden the cabinet.

3. Recapped the crossover.

4. Added some sand bags inside to increase mass.

4. Of course I had to refoam woofers and replace tweeters (blown from under powering, prior owner), but that is all just maintenance.

Sound was improved from stock when done. Tighter bass, and a bit smoother sounding mids and highs.
Thanks, I will look into this stuff. I did notice there was no insulation in the cabs, I thought that a bit odd. I was thinking of putting a 35lb plate in the bottom of each from my Olympic weight set (I have about 1000lbs worth of plates)
 

tivali

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#7
I did one thing - Added some sand bags inside to increase mass.
 
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