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#1
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Live Sound Question
Hi - somewhat of a newbie question her. I have a 2 channel board
that is rated at 600w per channel @ 4ohms, and 300w at @ 8ohms I am wondering which of the following would be perceived as being louder (ie. more volume) 1) Hook up two 8 ohms cabs to the stereo outputs of my board. Each cabinet would be feed from a separate internal amp getting 300w per channel 2) Hook up the two speakers in series and connect to the mono output of the board. I believe in that scenario each speaker would be getting 600w? Is that correct? Thanks, Tom |
#2
Posted to rec.audio.pro
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Live Sound Question
TM wrote:
Hi - somewhat of a newbie question her. I have a 2 channel board that is rated at 600w per channel @ 4ohms, and 300w at @ 8ohms I am wondering which of the following would be perceived as being louder (ie. more volume) 1) Hook up two 8 ohms cabs to the stereo outputs of my board. Each cabinet would be feed from a separate internal amp getting 300w per channel 2) Hook up the two speakers in series and connect to the mono output of the board. I believe in that scenario each speaker would be getting 600w? Is that correct? Thanks, Tom Probably not. When you say "mono", I hear "bridged mono". In that case, you can double the voltage available, but not the current. So a stereo amp that runs 600W @ 4 ohms can drive an *8* ohm load @ 1200W, but not a *4* ohm load @ 1200. 4 ohms would still be about 600W, for 300 per speaker. If you have Excel, you can calculate current as =SQRT(WATTS/IMPEDANCE) and voltage as =(WATTS/CURRENT) (you have to substitute the cell IDs for WATTS, IMPEDANCE and CURRENT of course ). Chances are good it's still current-constrained, and bridging is more likely to cause overheating into a 4 ohm load. If each half is rated at 2 ohms, then you can have more confidence in the amp's ability to drive 4 ohms bridged mono. Is there a value on the spec sheet for bridged mono operation max power and min impedance? -- Les Cargill |
#3
Posted to rec.audio.pro
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Live Sound Question
Les Cargill wrote:
TM wrote: Hi - somewhat of a newbie question her. I have a 2 channel board that is rated at 600w per channel @ 4ohms, and 300w at @ 8ohms Which board? - Automotive and pc speaker watts? - watts "musical power" or watts RMS? I am wondering which of the following would be perceived as being louder (ie. more volume) Same amplifier, same amount of energy, same conversion efficiency, same loudness. 1) Hook up two 8 ohms cabs to the stereo outputs of my board. Each cabinet would be feed from a separate internal amp getting 300w per channel 2) Hook up the two speakers in series and connect to the mono output of the board. I believe in that scenario each speaker would be getting 600w? Is that correct? Loudspeakers in series each get half the load assuming identical impedance. Loudspeakers in parallel on a bridged output is "look closely at the user manual" turf. Kind regards Peter Larsen Thanks, Tom Probably not. When you say "mono", I hear "bridged mono". In that case, you can double the voltage available, but not the current. So a stereo amp that runs 600W @ 4 ohms can drive an *8* ohm load @ 1200W, but not a *4* ohm load @ 1200. 4 ohms would still be about 600W, for 300 per speaker. If you have Excel, you can calculate current as =SQRT(WATTS/IMPEDANCE) and voltage as =(WATTS/CURRENT) (you have to substitute the cell IDs for WATTS, IMPEDANCE and CURRENT of course ). Chances are good it's still current-constrained, and bridging is more likely to cause overheating into a 4 ohm load. If each half is rated at 2 ohms, then you can have more confidence in the amp's ability to drive 4 ohms bridged mono. Is there a value on the spec sheet for bridged mono operation max power and min impedance? |
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