Hi guys,
I have a question regarding the Aleph 30 amplifier output impedance.
The user manual says that under 8 ohms load can deliver 30 watts and under 4 ohms can deliver 40 watts, but there is no clear information about the output impedance and the minimum load acceptable. Here the question.
Is there any disadvantage/trouble to load the Aleph 30 using a speaker with an almost constant 3 ohms impedance?
I think, for example, temperature issues and/or reduced dynamics performance of the amplifier due to the higher amp current solicitation.
I'm designing (ok, trying to) a high efficiency a speaker (91 dB) using 4 ohm drivers, and the final impedance I can obtain is allways under 4 ohms (see attached). Phase is almost perfect, spl response flat, efficiency goal achieved, but... impedance seems to be maybe too much under the 4 ohms I was planning.
Any advise?
Thanks a lot
I have a question regarding the Aleph 30 amplifier output impedance.
The user manual says that under 8 ohms load can deliver 30 watts and under 4 ohms can deliver 40 watts, but there is no clear information about the output impedance and the minimum load acceptable. Here the question.
Is there any disadvantage/trouble to load the Aleph 30 using a speaker with an almost constant 3 ohms impedance?
I think, for example, temperature issues and/or reduced dynamics performance of the amplifier due to the higher amp current solicitation.
I'm designing (ok, trying to) a high efficiency a speaker (91 dB) using 4 ohm drivers, and the final impedance I can obtain is allways under 4 ohms (see attached). Phase is almost perfect, spl response flat, efficiency goal achieved, but... impedance seems to be maybe too much under the 4 ohms I was planning.
Any advise?
Thanks a lot
Attachments
40W at 4 Ohms would indicate it is capable of around 4.5A peak.
So you should get 20W into 2 Ohms.
You're probably ok with a 91dB speaker.
It would be a safer bet building an F4 and a nice preamp to go with it.
Or build the BA2, it's very close to the sound signature of an Aleph J but with a push-pull output stage, so can drive any load with ease.
So you should get 20W into 2 Ohms.
You're probably ok with a 91dB speaker.
It would be a safer bet building an F4 and a nice preamp to go with it.
Or build the BA2, it's very close to the sound signature of an Aleph J but with a push-pull output stage, so can drive any load with ease.
Thanks
Aleph 30 user manual says:
The amplifier is stable into any load impedance or reactance including a direct.
The Aleph 30 is impervious to electrostatic shock at the input and dead shorts at the output...
Sounds good...
The highlight is mine, and I only want to be sure the amp will be happy under a 3 or 2 ohm load without trouble or drawback, so looking for confirmation from people experienced using this amp.
One thing is to behave stable or to be impervious, another to loss dynamics or increase distortion at low impedance, for example. That's my concern.
Aleph 30 user manual says:
The amplifier is stable into any load impedance or reactance including a direct.
The Aleph 30 is impervious to electrostatic shock at the input and dead shorts at the output...
Sounds good...
The highlight is mine, and I only want to be sure the amp will be happy under a 3 or 2 ohm load without trouble or drawback, so looking for confirmation from people experienced using this amp.
One thing is to behave stable or to be impervious, another to loss dynamics or increase distortion at low impedance, for example. That's my concern.
It will certainly be stable.
It may not be the best match for your speaker given the other choices available to you that's all.
I think it will be ok but not if you play loud.
At 4.5 A pk into 2 Ohms, that is only 9V pk signal or around 6.5 V rms.
You won't have those issues with the other amps mentioned above.
It may not be the best match for your speaker given the other choices available to you that's all.
I think it will be ok but not if you play loud.
At 4.5 A pk into 2 Ohms, that is only 9V pk signal or around 6.5 V rms.
You won't have those issues with the other amps mentioned above.
Yeah, I understand. Anyway I have the pcb boards and some other components yet, and love it's sound.
A30 Specs:
"Power Output 30 watts/ch @ 8 ohms, 40 watts @ 4 ohms
Maximum Output 25 volts, 5 amps"
nothing about lower impedance, which is like a "warning" to me...
Thx
A30 Specs:
"Power Output 30 watts/ch @ 8 ohms, 40 watts @ 4 ohms
Maximum Output 25 volts, 5 amps"
nothing about lower impedance, which is like a "warning" to me...
Thx
Yeah, may as well build it then.
Maybe you could add some drivers in series to bring impedance up a bit if it doesn't ruin the speaker design.
You could maybe do an omni design in the midrange.
One mid up firing and the other mid forward firing.
Both in series for 8 Ohms.
Linkwitz was fan of that. I personally think it would be a great thing to try.
Maybe you could add some drivers in series to bring impedance up a bit if it doesn't ruin the speaker design.
You could maybe do an omni design in the midrange.
One mid up firing and the other mid forward firing.
Both in series for 8 Ohms.
Linkwitz was fan of that. I personally think it would be a great thing to try.
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