blown speekers

[cider]

I lent my pa system to my sister over christmas. Unfortunately someone horsed the master volume to max rapidly and now both tweeters are dead. I have removed them from the cabinets and wondered if there is a way to test & or repair them. They are Peavey pro 15 600wat 4 ohms. Inside there is a circuit board which splits the signal between tweeters and subs. Is it likely the tweeters are damaged beyond repair or the circuit board ? Amp is a W audio DA1300 pro power amp. Advise apreciated

 

[OwainDIYer]

probably the tweeters

You can test for voice coil continuity with a multimeter (when disconnected from the crossover board)

 

[JohnD]

there must be somebody selling the things, but where would you find them?

 

[Sam Gangee]

I note that the DA1300 pro power amp is rated at 650 Watts RMS into 4 Ohms but the Peavey pro 15 600 speakers are only 300 Watts RMS, so not a good match and no surprise they got damaged.

You need to open one up to determine the make and model number of the tweeter. Then buy a replacement from the makers:-

http://peavey.com/support/contactinfo/

Or other supplier:-

http://www.ebay.co.uk/sch/i.html?_n...e=c&geo_id=32251&keyword=peavey+spares&crdt=0

 

[Nozzle]

The circuit board is a "cross-over" - it's a filter, either active or passive, that takes out the low frequencies so your tweeters aren't damaged.... okay they NOW are because of over load!

What I want to say is, the cross-over is tuned to cut-out those damaging low-frequencies so make sure when re-fitting new tweeters that they are specified correctly for use with this cross-over and also make sure it's soldered in properly.

Also, make sure your new tweeters have the same impedance as the old ones, hopefully it's written on the old ones somewhere (measured in ohms)

Nozzle

 

[Lucid]

It's very unlikely that the crossovers are damaged. IME the tweeters are usually the first casualty when a system is abused.

It's not because of an excess of power though. The usual culpret is distortion. This can either be from source signals (highly compressed MP3s, poorly aligned cartridges, over driving the mixer levels etc ) or from a power amp that has a paper specification that promises big power that the amp really can't deliver. The resulting distortion causes spikes in the upper end of the audio spectrum that are the equivalent of doubling and trebling the power output. This shorts the voice coils in tweeters.

The last decade or so has seen an influx of inexpensive Chinese-made power amps that seem to offer massive wattages at a fraction of the price of the traditional quality brands such as Crown. If ever you look at a spec sheet for those cheaper amps you'll often see that they give power in to 8/4/2 Ohm loads but don't specify the distortion figure or the frequency for those measurements. 650 Watts measured at 1kHz and at 10% or more Total Harmonic Distortion (THD) is worth the equivalent of around 80-100 Watts with a real world signal (20Hz-20kHz, @ 0.5% THD, 4 Ohms). Would you be so impressed with a £200 power amp offering 100 Watt compared to one promising 650W.

 

[winston1]

10 watts per channel with decent speakers is more than enough in the average domestic setting.

 

[OwainDIYer]

The Beatles played the Royal Albert Hall with 40 - 60 watt instrument amps.

 

[cider]

I note that the DA1300 pro power amp is rated at 650 Watts RMS into 4 Ohms but the Peavey pro 15 600 speakers are only 300 Watts RMS, so not a good match and no surprise they got damaged.

You need to open one up to determine the make and model number of the tweeter. Then buy a replacement from the makers:-

http://peavey.com/support/contactinfo/

Or other supplier:-

http://www.ebay.co.uk/sch/i.html?_n...id=32251&keyword=peavey+spares&crdt=0[/QUOTE]

Yep. Always thought i was sold a job lot. Also got 8 ohm subs which hardly do anytning. Should really have sent it all back but thats what happens when you order a pa system 2 am with 8 pints on board 😁

 

[theprinceofdarkness]

I looked at the Peavey site ( http://peavey.com/products/index.cfm/list/718/SpeakerComponents ) at their tweeters and the bottom 4 are rated at 25 W RMS, the one with the little tube on it (fifth one up?) is 100W WITH PINK NOISE?? Being a bit cynical, I wonder if this is to stop it shaking apart on some internal resonance.
In general , look at the heat coming of an old fashioned 100W bulb. As 98% of the power going into a tweeter comes out as heat, the thought of that amount of heat being dissipated in the little voice coil ~1" diam X 1" long, is amazing.
I wonder if the tweeter feed has a fuse in it which has blown?
Frank