Hello all,
I'm planning out a bi amp speaker project likely with miniDSP x-overs. and a separate sub. So i need 4 inputs with 4 discrete speaker outputs and a separate sub output to go to a powered sub.
Let me know if you having a recommendation on amps that i could look into.
thanks
these seem to be harder to find than i expected
Mauro
I'm planning out a bi amp speaker project likely with miniDSP x-overs. and a separate sub. So i need 4 inputs with 4 discrete speaker outputs and a separate sub output to go to a powered sub.
Let me know if you having a recommendation on amps that i could look into.
thanks
these seem to be harder to find than i expected
Mauro
Im taking the coax drivers out of the KEF Q150B. lets say 100W (speaker specs below).
will also want to add a powered sub.
Was looking at the marantz 5 channel amp:
Marantz US | MM7055
only issue aside from price is no sub output, but i can probably deal with that somehow. I would love to be able to control volume from the amp rather than pre-amp.
specs:
DRIVE UNITS 130mm (5.25in.) aluminium Uni-Q
25mm (1in.)vented aluminium dome HF
FREQUENCY RANGE FREE FIELD 47Hz (-6dB)
FREQUENCY RESPONSE 51Hz-28kHz (±3dB)
CROSSOVER FREQUENCIES 2.5kHz
MAXIMUM OUTPUT 108dB
AMPLIFIER REQUIREMENTS 10-100W
SENSITIVITY 86dB (2.83V/1m)
NOMINAL IMPEDANCE 8 Ohms (min.3.7 Ohms)
will also want to add a powered sub.
Was looking at the marantz 5 channel amp:
Marantz US | MM7055
only issue aside from price is no sub output, but i can probably deal with that somehow. I would love to be able to control volume from the amp rather than pre-amp.
specs:
DRIVE UNITS 130mm (5.25in.) aluminium Uni-Q
25mm (1in.)vented aluminium dome HF
FREQUENCY RANGE FREE FIELD 47Hz (-6dB)
FREQUENCY RESPONSE 51Hz-28kHz (±3dB)
CROSSOVER FREQUENCIES 2.5kHz
MAXIMUM OUTPUT 108dB
AMPLIFIER REQUIREMENTS 10-100W
SENSITIVITY 86dB (2.83V/1m)
NOMINAL IMPEDANCE 8 Ohms (min.3.7 Ohms)
Looks like fun. Lots of ways to go about it.
Which version of miniDSP? Are the inputs of miniDSP analog or digital? What will be your source?
You said you'd like to have volume control on the amp.
So my thought is that if you build an amplifier with volume control built in, you'll need at least 4-gang potentiometer after the DSP. So the signal path would look like:
Source > miniDSP > 4 channel volume control > 4 channel amplifier
Of course the volume control can be built into the 4 channel Amp case, and wired into the input of the amplifier.
Accuracy in level matching on all channels will be important for your XO to do its job correctly as you turn the volume up and down. Perhaps an inexpensive potentiometer could give acceptable results? I haven't tried. Gold-Point had some high quality stepped attenuators, but they seemed very expensive, so I haven't tried that either.
I chose instead to simply have a source with digital volume control before DSP. There are plenty of debates about digital and analogue volume control, and which is superior. I'm not certain that the difference would be audible to me, between two properly implemented methods of volume control. Even if you're doing volume control in the analogue domain, doing that before DSP means you only have to control two channels instead of four.
Is your listening position near field? Large room? You can get 86dB with one watt, and 96dB with 10 watts. That's actually extremely loud to me, in average size family room, 6 or 8 feet away from speakers.
Obviously I like the Neurochrome amps, great experience for me in building and listening. Ncore and UcD also interested me at one time, but they are Class D (and this is chip-amp forum). I bet you'd be pleased with any of these.
I have the diy bug, and want to build something in a different flavor just for fun. The MoFo in the Pass Labs forum really looks like a good bang for the buck, but preamp with plenty of gain will be required for MoFo. The plan would be to build FH-XL full range speakers to go with them.
Which version of miniDSP? Are the inputs of miniDSP analog or digital? What will be your source?
You said you'd like to have volume control on the amp.
So my thought is that if you build an amplifier with volume control built in, you'll need at least 4-gang potentiometer after the DSP. So the signal path would look like:
Source > miniDSP > 4 channel volume control > 4 channel amplifier
Of course the volume control can be built into the 4 channel Amp case, and wired into the input of the amplifier.
Accuracy in level matching on all channels will be important for your XO to do its job correctly as you turn the volume up and down. Perhaps an inexpensive potentiometer could give acceptable results? I haven't tried. Gold-Point had some high quality stepped attenuators, but they seemed very expensive, so I haven't tried that either.
I chose instead to simply have a source with digital volume control before DSP. There are plenty of debates about digital and analogue volume control, and which is superior. I'm not certain that the difference would be audible to me, between two properly implemented methods of volume control. Even if you're doing volume control in the analogue domain, doing that before DSP means you only have to control two channels instead of four.
Is your listening position near field? Large room? You can get 86dB with one watt, and 96dB with 10 watts. That's actually extremely loud to me, in average size family room, 6 or 8 feet away from speakers.
Obviously I like the Neurochrome amps, great experience for me in building and listening. Ncore and UcD also interested me at one time, but they are Class D (and this is chip-amp forum). I bet you'd be pleased with any of these.
I have the diy bug, and want to build something in a different flavor just for fun. The MoFo in the Pass Labs forum really looks like a good bang for the buck, but preamp with plenty of gain will be required for MoFo. The plan would be to build FH-XL full range speakers to go with them.
AlexQS,
thanks so much for the thoughts!
I dont think im ready to build an amp for this and would rather just buy an off the shelf 4 (or more) channel amp with a sub output.
I'm not sure if my post ended up in the wrong place somehow - maybe chip amps is the wrong spot - i'm new here.
the overall project includes 3d printing the cabinet with a spherical front baffle with concrete (or something similar) filled walls and a transmission line design.
In terms of source im thinking of a streaming front end like this:
WXC-50 - Overview - Wireless Streaming Amplifiers - Audio & Visual - Products - Yamaha - Canada - English
thanks so much for your input.
Mauro
thanks so much for the thoughts!
I dont think im ready to build an amp for this and would rather just buy an off the shelf 4 (or more) channel amp with a sub output.
I'm not sure if my post ended up in the wrong place somehow - maybe chip amps is the wrong spot - i'm new here.
the overall project includes 3d printing the cabinet with a spherical front baffle with concrete (or something similar) filled walls and a transmission line design.
In terms of source im thinking of a streaming front end like this:
WXC-50 - Overview - Wireless Streaming Amplifiers - Audio & Visual - Products - Yamaha - Canada - English
thanks so much for your input.
Mauro
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