Two drivers in parallel will try to draw double the current. If the amplifier were perfect (or you used two identical amplifiers) then the doubled current equates to doubled power and that gives a +3dB in SPL. A real amplifier will probably achieve +1.5dB to +2.5dB
If the two drivers can reinforce each others' output, there is potential for another +3dB in SPL. That extra output is only available over a narrow frequency range.
If the two drivers can reinforce each others' output, there is potential for another +3dB in SPL. That extra output is only available over a narrow frequency range.
i simulated the FR curves and i can see an increase in SPL when drivers are connected in parallel. can i safely use this SPL increased FR for passive xover design? one advantage i am seeing is both woofers(after connecting them in parallel) and tweeter have almost equal SPL, so no need for tweeter sensitivity attenuation.
however since the woofers have Rdc=5.8. after connecting in parallel effective Rdc=2.9 ohms which is very low for an amp rated at 4 ohms. how to tackle this problem?
however since the woofers have Rdc=5.8. after connecting in parallel effective Rdc=2.9 ohms which is very low for an amp rated at 4 ohms. how to tackle this problem?
is the amplifier rated for 4ohms speaker?
or is it rated for 8ohms speaker and also quotes a 4r0 maximum output power.
This is not the same as a 4ohm speaker rating. You must read and understand what the specification is telling you.
Why?
As the signal frequency rises, the two (or more) drivers interfere destructively and the lobing that results becomes very focused (narrowed) in the direction of the listener/s.
As frequency falls the lobing becomes very wide angle and a group of listeners will all be in the same constructive interference lobe and thus hear similar frequency response.
The angle of the interference "patterns" is determined by the driver cone spacing and the driver signal wavelength.
As the signal frequency rises, the two (or more) drivers interfere destructively and the lobing that results becomes very focused (narrowed) in the direction of the listener/s.
As frequency falls the lobing becomes very wide angle and a group of listeners will all be in the same constructive interference lobe and thus hear similar frequency response.
The angle of the interference "patterns" is determined by the driver cone spacing and the driver signal wavelength.
85W/ch into 4r0 or ?
What into 8r0?
Compare dBV for those respective maxima.
Has the amplifier output collapsed in trying to drive 4r0.
Will the amplifier output collapse trying to drive 4ohms?
For some idea of what the amp is capable of you can test it your self.
Find max dBV into 2r0, 4r0, 8r0, 16r0.
This will tell you a lot.
What into 8r0?
Compare dBV for those respective maxima.
Has the amplifier output collapsed in trying to drive 4r0.
Will the amplifier output collapse trying to drive 4ohms?
For some idea of what the amp is capable of you can test it your self.
Find max dBV into 2r0, 4r0, 8r0, 16r0.
This will tell you a lot.
Woofers up to 3 kHz are not mere woofers but midrange speakers as well.
Wavelength of 3 kHz is 4-5 inches, so you are in a zone where the lobing pattern alters.
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