So I'm listening to me F208s through bridged Rotel RB-976MkII which is a 6 channel amp. I'm using 2 of its amps bridged. Sounds good and doesn't seem to be heating up. Wanted to switch it up- been using the VTV Purifi for several months and wanted to see how the Revels sounded through the Rotel. Am I going to cause damage? I know the Revels dip pretty low.A simple rule of thumb with bridged amps is take the minimum impedance of your speaker and half it. That's what your amplifier will see. So if your speaker dips to 3.5Ω the amp will see 1.75Ω. Most amps won't like that and may die.
RMS power can be calculated, but RMS power is a meaningless quantity.
current RMS x voltage RMS = average power it DOES NOT EQUAL RMS POWER.
You need to do some basic reading on this subject.
So i think that the op youst missed the point. He not said you have more power with 16ohms. He just said that in his szenario the cable losses are less with the bridged 1kw amp and the two 8ohm speaker serial connected, than using two 500w amps non bridget and run two cables seperatly to the 8ohm speakers. But to be honest the way he talks is a littel confusing, at least for me, couse english is not my mother language and then following some jumps is not easy.
You may be bad at english, but yea, this makes sense now that he was talking about line losses not power as his main point.
Dave Rat got in contact with me and also sort of explained this. But this makes the most sense so far. Thank you.
And a Big thank you for all of you helping me understand what was going on and clarified my misunderstanding.
So to clarify, if I got this right, He is talking about Power to the speakers not actuall power output of the amp, but to the reactive load itself correct?
I think that is where I was confused.
So I'm listening to me F208s through bridged Rotel RB-976MkII which is a 6 channel amp. I'm using 2 of its amps bridged. Sounds good and doesn't seem to be heating up. Wanted to switch it up- been using the VTV Purifi for several months and wanted to see how the Revels sounded through the Rotel. Am I going to cause damage? I know the Revels dip pretty low.
RMS power can be calculated, but RMS power is a meaningless quantity.
current RMS x voltage RMS = average power it DOES NOT EQUAL RMS POWER.
You need to do some basic reading on this subject.
No such thing as RMS power. Current RMS x voltage RMS = Apparent power in VA, which isn't indicative of actual energy delivered to the load. For power amplifiers, the term "RMS power" simply refers to average continues power measured by a pure sine wave test signal (1kHz or few different test across the audible range).
Its the rms voltage ^ 2 / pure resistive load
P=u^2/r
I think its ok like it is. Who the hell likes to fight with cos phi on speakers?
We could add this on speakers to.
View attachment 153868
And a changing cos phi depending on frequency?
Joking
A speaker is very complex and nonlinear load. You got the crossover network, the driver, which acts as an AC motor with its own back EMF when the coil moves and oppose the applied current, and you also got the non linearity of the core saturation. The speaker impedance varies with both frequency and the current magnitude due to the back EMF which will increase as the motion range increases due to higher current...
This is why self oscillating modern class D amps have a huge advantage, due to the feedback loop closed at the input terminal of the speakers, which allows the amp to be almost load invariant. The amp controller will vary the current shape and the switching frequency to compensate for the speaker non linear behavior, ensuring the original signal is always applied to the speaker.
A better solution will be a class D based powered speaker with servo control, in which voltage, current and driver movement signals are observed and used as feedback signals to the amp's controller. Also add a DSP with pre calculated filter coefficients, for acoustic compensation, and you got yourself the prefect speaker. I hope Bruno is reading this...
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