So, according to the gang at TGP...
- Thread starter jelloman
- Start date
jelloman
Couch'd Tater...
it's got outputs for 8 and 4 ohm cabs...
Well, if you're adding a second speaker you're going to move more air.
Sound is (in this case) air moving.
Move more air, make more noise.
I'm not sure about the impedance helping... Need to think about/research it.
Sound is (in this case) air moving.
Move more air, make more noise.
I'm not sure about the impedance helping... Need to think about/research it.
wagdog
Ack
If you use an identical SINGLE 8 ohm or SINGLE 4 ohm speaker using the respective tap, the amp will produce the same volume. The impedance difference is due to the number of windings on the speaker side of the output transformer. Perhaps there will be a difference in volume, but I doubt it (could be wrong).
If you add a second 8 ohm speaker (in parallel) to an existing 8 ohm speaker, you will have a resulting 4 ohm load and would use the 4 ohm tap on the amp. You would then be moving more air (twice the amount), and it would follow that would translate to more volume. How much more volume would depend on the efficiency of the other speaker.
If you add a second 8 ohm speaker (in parallel) to an existing 8 ohm speaker, you will have a resulting 4 ohm load and would use the 4 ohm tap on the amp. You would then be moving more air (twice the amount), and it would follow that would translate to more volume. How much more volume would depend on the efficiency of the other speaker.
What Bob said..
And here's some detail:
"Loudspeakers have impedances of 8 ohms, 6 ohms or 4 ohms (those are "nominal" or approximate values, because the impedance of a speaker changes all the time with the different frequencies of music). A 4-ohm speaker draws more electric current through your AV receiver's output transistors, and since more current equals greater power, 4-ohm speakers tend to have greater dynamic range and play louder more easily than 8-ohm speakers."
So, yeah that's about AV receivers, but the impedance points are true for amps.
What you will read about AV receivers is that it doesn't really matter if you mix and match speakers of different impedance - at least as far as the output circuits of the receiver is concerned.
THAT'S NOT TRUE FOR GUITAR AMPS!
You should always have a load of whatever the minimum impedance the output circuit expects. So, an 8-ohm speaker would work fine plugged into a 4-ohm output circuit. But never lower as that will draw more current than the output circuit wants to put out.
And here's some detail:
"Loudspeakers have impedances of 8 ohms, 6 ohms or 4 ohms (those are "nominal" or approximate values, because the impedance of a speaker changes all the time with the different frequencies of music). A 4-ohm speaker draws more electric current through your AV receiver's output transistors, and since more current equals greater power, 4-ohm speakers tend to have greater dynamic range and play louder more easily than 8-ohm speakers."
So, yeah that's about AV receivers, but the impedance points are true for amps.
What you will read about AV receivers is that it doesn't really matter if you mix and match speakers of different impedance - at least as far as the output circuits of the receiver is concerned.
THAT'S NOT TRUE FOR GUITAR AMPS!
You should always have a load of whatever the minimum impedance the output circuit expects. So, an 8-ohm speaker would work fine plugged into a 4-ohm output circuit. But never lower as that will draw more current than the output circuit wants to put out.
Guitar Heel
Demented Trick
:ewh:
Bob411
thrumming with potential
Went to MF, and clicked on the first PA amp I found:
http://www.musiciansfriend.com/pro-audio/crown-x3000-stereo-2x750w-power-amp?rNtt=crown amplifiers&index=1
Guaranteed Minimum Power: 750W (per channel) @ 4 ohms / 500W (per channel) @ 8 ohms
http://www.musiciansfriend.com/pro-audio/crown-x3000-stereo-2x750w-power-amp?rNtt=crown amplifiers&index=1
Guaranteed Minimum Power: 750W (per channel) @ 4 ohms / 500W (per channel) @ 8 ohms
Help!I'maRock!
Mediocringly Derivative
Modern Saint
Starve your Fear, Feed your Dream!
Rule #1 - If an amp is designed for an 8 ohm speaker, changing it to a 4 ohm may get louder but will also put a strain on the amps output section. Tube amps are more tolerant of the impedance mismatch but solid state just does not like it all.
Rule #2 - On solid state amps, do not mismatch the impedance. It can heavily stress the output section to the point of failure no matter what the output is. Also always have a speaker load attached. Worse is nothing attached to an amp to stress the output section even more.
@jelloman - If you want louder with what you got, get an open back cab. Upgrade the speaker to a better speaker.
Rule #2 - On solid state amps, do not mismatch the impedance. It can heavily stress the output section to the point of failure no matter what the output is. Also always have a speaker load attached. Worse is nothing attached to an amp to stress the output section even more.
@jelloman - If you want louder with what you got, get an open back cab. Upgrade the speaker to a better speaker.
wagdog
Ack
Which would be a 4 ohm cab at that point and should be plugged into the 4 ohm tap on your amp.
And yes, 2 speakers will be louder than one.
baimun
Funkasaurus Rex
comprehensive answer from Hughes and Kettner.
http://hughes-and-kettner.com/ohm-cooking-101-understanding-amps-speakers-and-impedance/
http://hughes-and-kettner.com/ohm-cooking-101-understanding-amps-speakers-and-impedance/
realtree71
I crash bikes
8-------->4 is ok not so good but ok
16------->4 youll let the smoke out
16------->4 youll let the smoke out