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Some good deals at partsexpress right now...
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OSCAR:
4" 8 ohm shielded speaker for $.87!  The pic looks exactly like the Bob Roberts 4" shielded speaker, and should be perfect for a cabinet project.

http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=269-568


Their vinyl laminate is on sale right now for $11/roll, too.

http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=260-018

sofakng:
I'm almost finished constructing my cabinet according to the Project Arcade book, but I really haven't thought about speakers yet...

Here are some spare speakers I have-- both were taken out of my 1995 Eagle Talon TSi.  The second pair (generic ones) were the factory installed speakers.

2x Polk dx Series 6 1/2" "Premium Performance Loudspeaker"
Impedance:  4 ohms    model:  dx628238

2x Generic  5"  (looks like 5" anyways)
Misc information on back of speaker:   4 ohm, 16 W, model: (?) 480K10707, 4MN1C1

Now, I know that the Polk audios ones are far superior, but are 6 1/2" too big to use?  How can I tell if they are shielded?  Will I need anything else to hook these up to my computer's sound card?  What about grills?

...or should I skip my speakers and purchase the ones you listed?  (cheapest shipping was $8 for me... I'm in PA)

Sorry for so many questions....

wakerlet:

--- Quote from: OSCAR on June 24, 2004, 07:24:50 pm ---4" 8 ohm shielded speaker for $.87!  The pic looks exactly like the Bob Roberts 4" shielded speaker, and should be perfect for a cabinet project.

http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=269-568


Their vinyl laminate is on sale right now for $11/roll, too.

http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=260-018



--- End quote ---

Question:  If I have an amp that states (4 ohm load per channel minimum) can I then use 8 ohm speakers?
OSCAR:
wakerlet - You can use 8 ohm speakers on an amp rated for 4 ohms, you just don't want to do it the other way around; say use 4 ohm speakers on an amp only rated for an 8 ohm load.

I pulled a speaker out of a TV (because it was already sheilded) that was a 16ohm driver, and I used that just fine in an arcade cabinet.  The biggest difference is that an 8 ohm speaker will be a little quieter than a 4 ohm speaker at the same output wattage, but most arcade pcb's have sufficeint amps to make that a non-issue.


sofakng - Same here... you should check to make sure the amp you are using is capable of a 4 ohm load if you want to use car speakers.  Or  you could wire a pair in series per channel for a 8 ohm load.  You can pretty much bet that car speakers are not shielded.


Tiger-Heli:
A little more on the speakers discussion -

Eight ohm speakers with a 4-ohm amp will reduce the power by half - For example - if your amps puts out 50 watts at 4 ohms, it will put out 25 watts at 8 ohms at the same power setting.  Not a problem, but your speakers will sound like they have half as powerful an amp.  (And it would put out 100 watts at a 2-ohm load, but many amps are not 2-ohm stable - i.e. at high power settings it might overheat and destroy the amp).

Also, if you have two 4-ohm speakers per channel, you can wire them in series to create an 8-ohm load, or parallel to create a 2-ohm load.  (Or two 8-ohm speakers in parallel to create a 4-ohm load).
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