Parts List -
Tweeter Circuit -
Clarity Cap ESA
Mundorf Mox
Jantzen Inductor

Midbass Circuit -
Solen Inductors

Upgrade Features -
Point to point wiring
Fortress Plates
99.99% Copper, Gold Plated Insulated Binding Post
Complete, easy to reinstall package

Price of Upgrade?
Please email for pricing,


Learn more about Fortress Mods, Click Here!

Want to Do It Yourself? No problem!

Thoughts from the customer?
I am the one that there crossovers were built for. I had a capacitor go bad on one speaker crossover. I thought replacing the capacitor would be sufficient. Along the reading path I found the discussion related to upgrading crossovers. My decision was made. For some background I am an EE BS/MS with over 30 years of piratical experience. I felt the upgraded crossover would make a difference by one that would be unnoticeable. Well I was wrong. My suggestion to those that have LS90s and love them, you have no idea what you are missing. If you have the cash (and it's nothing that will kill you) my recommendation is to contact Trey at 'VR3 Mods' <>. Here are my first impressions:

1. I have now listened to a range of music from Classical, Rock, and Alternative. The sound is much more ranging and true than ever before. The highs are higher and the lows lower. The speakers which were already excellent have now become even more incredible. I didn’t think it was possible.
2. I seem to have the ability to throw more power at the speaker without distortion. Using a Hafler 9500 amp at the 2 o’clock position (250W very pure). Never got there before.
3. Acoustical guitar where I thought before was awesome has gotten even better. I can very clearly hear fingers sliding up and down the guitar strings, very cool.
4. Oddly where high volume would make my CalLabs CD player skip seems not to have this problem. This does not completely make sense and will need some further thought, But a nice side effect if it holds.
5. In all, I’m happy with the investment which really did make a notable difference to already super speakers.
6. I will post these impression on you web site (probably more as well), but need to head off to my next chores.

Trey – thank you for your guidance along the way and the incredible craftsmanship. There are few out there that really understand basic engineering (resistors, capacitor, and inductors, and how they work), especially how it relates to and enhances audio. Great Job!!! Thank you.

RECOMMENDATION - contact Trey and a least explore the concept (especially if you are reading this post). Good luck. - Rob, Fortress LS90

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