refurb of speaker cabs
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Posted on Jun 18, 2008 02:31 am
Kaos62
Kaos is only a form of insanity
Member Since: Feb 03, 2005
My question is as follows,
I have a pair of 1990's speaker cabs which I use for my practice room set up and eventually for small gigs (pub type) They have a 15" woofer 350w, a mid range piezo and a high range piezo. I have replaced the 15" with appropriate eminence speakers due to the old ones being knackered. Now I woul like to replace the piezo tweeters, both mid and high.
I know I could get direct replacements for these and would not cost very much at all, however I would like to increase the quality of sound from these units. I require advice as to what would be the best way to go with regards to modifying the mids and highs. Would I go with a mid and high range compression unit seperately or just use one (my reasoning is to keep 3 units) I do realise that I would need to add a crossover into the cab and probably change the hole size for the existing units (which isn't a problem as I'm very useful in the carpentry dept)
As a side note, I have an active cross over , so I could always go down the road of bi-amping the units and using the active crossover to supply the correct freq's
I look forward to your replies
Cheers then!
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Jun 18, 2008 09:57 am Off the top of my head, without much thought I assume the speakers currently have a 3 way crossover in them, if you change the mid and hi speakers, you may have to change the crossover to accomodate the new speakers...if you swap them for the same models, it'd be much easier.
The tuning of the cabinet is dictated by the woofer by and large, by changing that, you may need to adjust the tuned ports to suit...
That said, I'd change them with the same you had.
Kaos62Kaos is only a form of insanityMember
Since: Feb 03, 2005
Jun 19, 2008 12:30 am I have replaced the woofers with the same size and output rating, it now leaves the mid + high piezo to do. NO real xover is in place as it's using piezo's with resistors in line and just a small single filter type unit on input.
I have been looking at the port size according to my new woofer and it is the same requirement (give or take 1%)
Jun 19, 2008 12:46 pm There is a very good book on this subject that is sold by Radio Shack.
It's written by a guy buy the name of Simms. And I believe that it's called Speaker Enclosure Construction.
He really gives you all of the math for choosing your drivers, and the dimensions that you need in the cab for them.
He takes you through the math step by step. I have used this on several occasions. And it has been fantastic.
The designs that he builds for the book. Are a little out there. I'm sure that they sound good. They are just not anything that I would use.
On a personal note. I am not the biggest fan of Piezo. They have a short throw, and tend to be to bright. For the shop that I work in. I just ordered the P.A.S. neodymium compression drivers. They are cheap, and have a lot of horse power behind them. And they are for the most part, flat.
If you can find the book over at Radio Shack. Let me know. I think I can dig up a copy of it somewhere.
