upgrading my boston acoutics for more kick

[muska4141]

I have old Boston Acoutic VR20 towers that were given to me long time ago.....

Recently i purchased some new tweeters, damn there so clean and bright! you can hear alot more dialouge, but im going to replace the woofers on both towers....but my question is do i need to rework my crossover for these to sound even better? they will be my surrounds though!for my home theater...

the tweeter i have now:
-Heavy Duty Titanium Super Tweeter TW44
Overview
• Power handling: 150 watts RMS/300 watts peak power (with included crossover capacitor) • VCdia: 1" • Impedance: 4~8 ohms • Re: 3.5 ohms • Frequency response: 2,000-20,000 Hz • SPL: 104 dB 1W/1m • Magnet weight: 30 oz. • Dimensions: face: 3-1/8" square, depth: 2-1/8".
Highlights
Diecast aluminum housing
Ferrofluid cooled
Kapton voice coil
Includes crossover capacitor

But the woofers i was looking at are:
Usher 8836A 7" Kevlar Woofer w/Truncated Frame
Overview
The yellow Kevlar cone with black dustcap gives this driver a very modern and attractive look. The Kevlar cone material offers excellent midrange and midbass clarity, while still maintaining great dynamics.
Highlights
Yellow Kevlar cone and rubber surround for an attractive modern looking woofer
Truncated cast frame for close driver spacing on speaker baffles
Low-distortion motor structure for enhanced clarity and great dynamics


any help would be nice thanks

[wintermute]

I've moved to multiway as it should be the right audience

[sreten]

Originally Posted by muska4141

....damn there so clean and bright! ....

Hi,

Yes, and probably totally wrong. That driver has a large 5K peak that
allthough improving intelligibility, its not exactly hi-fi. Sensitivity is
also way too high, they'd need L-padding down to suit.

The Usher bass driver you are considering has a smooth rising response,
and is a good choice to use with an original fairly standard crossover.
Though i'd never consider "upgrading" properly working bass/mids.

rgds, sreten.

If it ain't broke don't fix it. I understand the VR20 had pretty good tweeters ...

[muska4141]

1 tweeter poped, and woofer was messed up!actual took them from my brother that i lent him....so wanted to upgrade the whole thing....im new to all this though!what i L-padding?

[wintermute]

I was going to suggest a search but having done one myself It didn't return anything useful. an l-pad is an attenuation network which will reduce the level of a driver.

Here is a calculator L-Pad (Driver Attenuation Circuit) Designer / Calculator also click on the help link below the calculator for a bit more theory.

I'd also suggest reading this tutorial to get some grounding Introduction to designing crossovers without measurement

Personally I advocate making measurements but the above is an excellent tutorial for those who don't want to or haven't got the facilities to go down the measurement path.

Tony.

[sreten]

Originally Posted by muska4141

1 tweeter poped, and woofer was messed up! actual took them from
my brother that i lent him....so wanted to upgrade the whole thing....
im new to all this though!what i L-padding?

Hi,

The simple facts of the matter are "upgrading" decent knackered speakers
with different drivers does not work very well, and for the cost you would
be far better off with a used pair of fully working quality speakers.

Its very difficult to upgrade a speaker unless you know what you are
doing. Your tweeter choice simply doesn't belong in a hifi system IMO.

I'm all for DIY, when it works, is cost effective, and makes the builder happy.

rgds, sreten.

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