Any help is greatly appreciated, since this is my first 3 way build,
I would like to use this with an 8ohm amplifier, either tube SE, or solid state, wondering if using the woofer which is 4ohm will be compatible, since my mod is the desired 8ohm,
Woofer: Vifa m26wr-09 4ohm
Mid: Vifa D75MX-30 8ohm
I would like to use this with an 8ohm amplifier, either tube SE, or solid state, wondering if using the woofer which is 4ohm will be compatible, since my mod is the desired 8ohm,
Woofer: Vifa m26wr-09 4ohm
Mid: Vifa D75MX-30 8ohm
If the amplifier can accept 4 Ohm You can use it, but bear in mind if it is a 500W amp, at 8 Ohm You can't drive it to max. It should work with half the power. The speaker impedance is usually given by the woofer's impedance.
As MAACO says, if you use a 4 ohm woofer then the overall impedance of the speaker system will be 4 ohm - so make sure your amplifier is comfortable working into a 4 ohm load.
The mid can be 8 ohm and the tweeter either 4 or 8 ohm, but the crossover has to be designed to take the individual impedances of the constituent drivers into account.
The mid can be 8 ohm and the tweeter either 4 or 8 ohm, but the crossover has to be designed to take the individual impedances of the constituent drivers into account.
Moved to Multi-Way
The type of output stage used in a tube amplifier determines how well the amplifier handles a mismatch.
It is safe to say that the best performance will be obtained when the impedance is matched.
Some specific advice from SE tube amp users as to the suitability of running 4 ohm speakers from an 8 ohm tap would be welcome.
It is safe to say that the best performance will be obtained when the impedance is matched.
Some specific advice from SE tube amp users as to the suitability of running 4 ohm speakers from an 8 ohm tap would be welcome.
You were just told it is NOT OK
Your cabinet is now 4 ohm so it is mismatched to amplifier 8 ohm tap.
Thanks Pete!
In summary: Using a 4 ohm speaker on an 8 ohm tap means that power tube lifespan may be shortened. This is especially true of Class A amps.
If you did this:
(a) You would throw away half of your amplifier power in heating up the resistor.
(b) The amplifier would not be in proper control of the loudspeaker so the sound would suffer.
Thanks guys I appreciate all of your comments, so so much, truly, I have learned a lot, and hope to learn more,
Thanks for returning with your thanks!
You'd be surprised how many question posters do not.
I'm sure we'll all be happy to answer any further questions.
You'd be surprised how many question posters do not.
I'm sure we'll all be happy to answer any further questions.
I'm not sure I agree with this. The average current in a SET is set at design time so is independent of the load.
With a 4 ohm load on an 8 ohm tap the current swing is increased and the Voltage swing is reduced but the same power is sent to the load. What it can do in a hifi situation is to change the output impedance of the amp, and therefore the bass response.
It can also reduce the available maximum output compared to an 8 ohm load, because the available current was fixed.