desperate help needed for p.a design

[luke691]

I recently bought and built two amp kits (they were an absolute bargain) and was thinking of using them as a small p.a.

I have no idea what speakers i should be using, or, what range the system should have.

from the magazine the project was posted in:
" Features-
Output Power: 36w RMS into 4 ohm
Music Power: 70w into 4 ohm
Frequency Response: -1db down at 28hz and 55khz"


(money wise im fairly limited (im 15) and was hoping to get this project done soon so i could start using it for band rehearsals.

Thanks

[Dan2]

If you are only using it for band rehearsals, would you just be using the amp to power on-stage monitors?? ('cause you wouldn't need front of house speakers)

and what instruments are you going to run through the system?? (mics, guitars etc)

Im no expert, but a 10" full range driver with a tweeter in a wedge enclosure should work well. build 2.

[tinitus]

http://www.tube-town.net/ttstore/ind...tsprecher.html

http://www.tubeampdoctor.com/index.php?cPath=37

[luke691]

the amp will most likely be for mics, and an upright bass, but occasionally it will be used for guitars.

i have two of theses modules, i've already built one and using a 12v SLA Battery connected to a 50w Rms, 100w max power speaker with a midrange and two tweeters used for radio and cd's the amplifier was to powerful for these speakers.

what sort of power should the tweeter/speaker be able to handle each?

would i be able to use a woofer such as the one on this site

http://www.radioparts.com.au/ProdVie...oduct=39155017

and a horn or tweeter and if so would i need a crossover

thanks for all the help

[luke691]

i found this car speaker kit including crossover bass/midrange speaker and tweeter, the kit includes two of each and seems like a decent price

http://www.altronics.com.au/index.as...=item&id=C9302

any suggestions should i buy?

is this setup appropriate?

[Nigel Goodwin]

Originally posted by luke691
i found this car speaker kit including crossover bass/midrange speaker and tweeter, the kit includes two of each and seems like a decent price

http://www.altronics.com.au/index.as...=item&id=C9302

any suggestions should i buy?

is this setup appropriate?

No, don't use car speakers for PA - they are generally vastly over rated for power, and are intended for fairly low sound volumes in a small space.

For PA you want a speaker that fills a room, and withstands plenty of power through it.

Feeding most '1000W' car speakers from a 100W PA amp would probably blow the speaker.

[luke691]

thanks, i've ditched that idea, but i found some speakers close to home;

a horn, that i apparently can connect to a woofer without the need for a crossover, and a woofer that is fairly cheap and can apparently handle 100w->>>

Horn

Woofer

would this be appropriate

im not to fussed

[Cal Weldon]

I don't see a woofer with that link. (EDIT: now I do.)

That woofer looks to be a cheap OEM with very low sensitivity. I think you might want to check online for some PA drivers.

Piezo tweeters are OK for small pa work and may be an option to consider if you don't like the idea of XO's.

[dark_avenger]

i've found the jaycar speakers to be alright there not great but for the price there not bad.

[luke691]

thanks for all the help,

im most likely to go with a peizo horn/woofer combo
one thing that i still dont understand however is;
why, when using the amplifier that supposedly put out 36w rms, when connected to a set of speakers that could handle 50w rms was the amplifier to powerful. is the label; wrong, or is there another reason how do i avoid this when picking speakers