Hi Guys
I need some expert well-informed advice, please.
- I use a Rotel RMB1075 power amp. Specs: 120Watts RMS per channel, all channels driven, 20Hz - 20KHz +-3db. Power consumption = 800Watts. I derive from this that the amp is REALLY pushing a concurrent 120Watts per channel, with all channels driven - concurrently. They are not "logical" or "virtual" channels. They are actual, hardwired separate channels that use one power supply.
- So,
I use an RC1090 in front of the RMB1075. It's got four RCA outputs: 2 for left channel, 2 for right channel.
- So RC1090 top left to "front" left, bottom left to "Rear" Left. RC1090 top right to "front" right, bottom right to "rear" right.
- Then,
RMB1075 front left to high-level binding posts on left speaker, rear left to low-level binding posts on left speaker.
Likewise with right-hand speaker.
One channel on the RM-1075 is not used.
- So, here's the question statement:
Scenario (1) I believe I'm pushing 120Watts RMS x 2 (240Watts RMS) into the left speaker and 120Watts RMS x 2 (240 Watts) into the right speaker
- Some people however say it remains 120 Watts pushed into each speaker, not 2 x 120 Watts. They say it's because the channels are all being driven from the same power supply.
- It does not make sense to me.
Here is my reasoning:
Scenario (2) Let's assume I have 2 pre-amps (each with only one left and one right RCA out). The pre-amps and their associated speakers are in their different zones, and the RMB1075 is in the middel because it can drive four independent channels - 2x to each of the 2 zones:
- Pre-amp 1 is hooked up to "front" right & left. Likewise the one pair of speakers (single binding posts) is hooked up to the "front" left & right speaker outputs. This should yield 120 watts per channel for speaker pair 1, right?
- Pre-amp 2 is hooked up to the "rear" right & left. Likewise the second pair of speakers (single binding posts) is hooked up to the "rear" left & right speaker outputs. This should also yield 120 Watts per channel for speaker pair 2, right? And all these channels are driven from the same power supply...
- If I follow the thinking that 2x 120watts in scenario (1) above applies, it translates to 120watts/2 = 60 watt per channel in scenario (1) above - because all channels are using the same power supply?
- If I follow the same thinking it means that 4x 120watts in scenario (2) = 120watts/4 = 30watts - because they use the same power supply.
Is this true?
I would like to believe that all channels maintain their 120watts per channel on the RMB1075 regardless of connection setup. Am I wrong?
Thanks.
Nico
I need some expert well-informed advice, please.
- I use a Rotel RMB1075 power amp. Specs: 120Watts RMS per channel, all channels driven, 20Hz - 20KHz +-3db. Power consumption = 800Watts. I derive from this that the amp is REALLY pushing a concurrent 120Watts per channel, with all channels driven - concurrently. They are not "logical" or "virtual" channels. They are actual, hardwired separate channels that use one power supply.
- So,
I use an RC1090 in front of the RMB1075. It's got four RCA outputs: 2 for left channel, 2 for right channel.
- So RC1090 top left to "front" left, bottom left to "Rear" Left. RC1090 top right to "front" right, bottom right to "rear" right.
- Then,
RMB1075 front left to high-level binding posts on left speaker, rear left to low-level binding posts on left speaker.
Likewise with right-hand speaker.
One channel on the RM-1075 is not used.
- So, here's the question statement:
Scenario (1) I believe I'm pushing 120Watts RMS x 2 (240Watts RMS) into the left speaker and 120Watts RMS x 2 (240 Watts) into the right speaker
- Some people however say it remains 120 Watts pushed into each speaker, not 2 x 120 Watts. They say it's because the channels are all being driven from the same power supply.
- It does not make sense to me.
Here is my reasoning:
Scenario (2) Let's assume I have 2 pre-amps (each with only one left and one right RCA out). The pre-amps and their associated speakers are in their different zones, and the RMB1075 is in the middel because it can drive four independent channels - 2x to each of the 2 zones:
- Pre-amp 1 is hooked up to "front" right & left. Likewise the one pair of speakers (single binding posts) is hooked up to the "front" left & right speaker outputs. This should yield 120 watts per channel for speaker pair 1, right?
- Pre-amp 2 is hooked up to the "rear" right & left. Likewise the second pair of speakers (single binding posts) is hooked up to the "rear" left & right speaker outputs. This should also yield 120 Watts per channel for speaker pair 2, right? And all these channels are driven from the same power supply...
- If I follow the thinking that 2x 120watts in scenario (1) above applies, it translates to 120watts/2 = 60 watt per channel in scenario (1) above - because all channels are using the same power supply?
- If I follow the same thinking it means that 4x 120watts in scenario (2) = 120watts/4 = 30watts - because they use the same power supply.
Is this true?
I would like to believe that all channels maintain their 120watts per channel on the RMB1075 regardless of connection setup. Am I wrong?
Thanks.
Nico
