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FDP Forum / Amp Mods, Repairs, and Projects / Speaker crossover networks

wrnchbndr
Contributing Member
*******

New Jersey

The otters threw me out
May 4th, 2012 11:52 PM Edit Profile Print Topic Search Topic
Not common in a guitar amps but the knowledge might be here in this section of the FDP...

I have recently encountered a number of speaker cabinets, both guitar and bass amps and PA speakers that employ tweeters yet there is no crossover network used. The high frequency driver is directly in parallel to the main speaker. I always understood that lower frequencies would destroy a high frequency driver. What is the deal here? Why is no crossover required?

SonicBlue

Sunbury-on-Thames

May 5th, 2012 05:25 AM Edit Profile Print Topic Search Topic
Some tweeters have built in crossovers, piezo drivers have inherent capacitance which 'automatically' blocks low frequencies.

ECS-3
Contributing Member
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USA / Virginia

May 6th, 2012 12:25 PM Edit Profile Print Topic Search Topic
Yes, those tweeter units typically used for musical instruments are piezo that either don't require the crossover, or it's built in.

High fidelity units usually use a 'dynamic' type tweeter (voice coil / diaphragm) with either a cone or would use an acoustic horn. These types do require a crossover and can be damaged if they driven below their low frequency cut off.

In the case of a compression driver, those can be damaged if the horn is not attached, even if it's already connected to a crossover network. Compression drivers should never be powered without it's horn attached.

Peegoo
Contributing Member
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That chicken

is WRONG, baby.
May 6th, 2012 02:03 PM Edit Profile Print Topic Search Topic
Yep!

FDP Forum / Amp Mods, Repairs, and Projects / Speaker crossover networks

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