Lonely Raven
Seasoned Member
  

Jack of all Trades, Master of None
Posts: 3567
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I've been down that path, and wish I had upgraded sooner.
I had the Polk LS70 - which I really liked in general.
The mods I did before I gave up on them:
Ran wire from the amp, directly to the drivers, completely bypassing the jack on the back.
Tall spikes added.
Added 1" Plywood panels to the sides to deaden resonations (ugly, but amazing improvement - oddly enough, looks like a crude version of the Decware MG944 slab sides).
Added "fun tack" to the metal frame of the drivers to deaden ringing in the drivers.
Messed with crossover, but ultimately I just ran the woofers full range, and the tweeters with a single capacitor and nothing else - I had to play with the phase to get it to work, but it was great in the end - though probably not flat frequency response by any stretch - the detail was amazing compared to my memory of stock.
I may have also messed with adding a "stick" wedged between the magnet of the woofers and the back of the cabinet to stiffen their mount to the cabinet. This would have happened after adding the plywood to the sides of the speakers.
I may have also messed with various amounts of polyfill to micro-adjust the tuning. It doesn't have a huge effect, it was more for fun.
Lastly, I recall at one time I think I may have put something inside the cabinet (besides polyfill) to help absorb reflections inside the box. I don't think this did much as I had so much polyfill in the cabinet that it was starting to come out the port!
That was all 10+ years ago, and I since sold the speakers to a friend who plays the snot out of them to this day. Ultimately, what I made was a half-assed cobbled together version of Steve and Bob's MG944 - the same speaker I just bought off Steve recently and I'm much happer with. So if you can swing it, look at better speakers. The Polks are a fun education, but you can do better.
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