Great, thanks Art. What I'm not quite clear on is whether the daisy output will allow me to use the dsp for an additional amp as you've mentioned, just because the manual says they can be hooked together but each one has it's own dsp. So when they are hooked together, does only one of the dsp filters work? Does one automatically get turned off?
Speaker is not pure resistive load, so effective real power cannot be calculated by simply multiplying voltage and current.
There is a lot more going on about how much effective input power is converted to a acoustic power.
Speaker has both inductive and capacitive load characteristics, current lags or leads voltage and thus there is effective true power and apparent power (power factor).
So one must understand the difference beetween resistive- and reactive/inductive load which the speaker driver really is mostly. We need to know how the speaker (and amplifier) actually behaves as a whole before making any conclusions about energy conversion efficiency. Or, how much actual power is needed for given output SPL. It might be surprise to someone if you plug power consumption meter beetween amplifier and mains. Then compare the input power at different frequencies trying to keep the output SPL constant 🙂
There are spots where input power is pretty low, there are spots where amplifier is heating a lot. As the speaker cone moves back to zero position, it releases its stored energy - which is mostly wasted in amplifiers output stage as a heat at some frequencies depending the enclosure, tuning frequency and so on.
As one knows, some speakers are quite difficult load for amplifier.
That is very true, but the specified impedance gives a indication towards what is close to the lowest point of resistance of that driver, IE where it consumes the most power. And Ohm's Law is true for any frequency, really.
Especially for bass this works really well, because that's the region where the drivers usually have the lowest dip in impedance. I doubt that the amplifier in question would have any trouble driving an 8Ohm load if it's already providing power for 4Ohms (2 drivers parallel vs 4 drivers series/parallel), but you are likely to not gain anything at all, except possibly slightly lower distortion, because the amplifier will likely produce half the power for double resistance.
Okay, it was a simplified answer, but simple does not mean it's wrong.
Especially for bass this works really well, because that's the region where the drivers usually have the lowest dip in impedance. I doubt that the amplifier in question would have any trouble driving an 8Ohm load if it's already providing power for 4Ohms (2 drivers parallel vs 4 drivers series/parallel), but you are likely to not gain anything at all, except possibly slightly lower distortion, because the amplifier will likely produce half the power for double resistance.
Okay, it was a simplified answer, but simple does not mean it's wrong.
There is a separate "FILTER OUTPUT" and "POWER AMP INPUT" on the Linn AV5150 sub.
Nothing other than the power standby appears to be automatic.
It appears the analog dip switch set low pass filter, adjustable from 41 to 79 Hz is carried to the "FILTER OUTPUT", which is connected to the "POWER AMP INPUT" with a phono lead (RCA cord).
My guess is the "DAISY OUT" is internally connected to the "FILTER OUTPUT", the "DAISY IN" to the "RIGHT INPUT".
The "DAISY OUT" or "FILTER OUTPUT" could be used to drive an additional amp powering your additional speakers in additional boxes, but it does not appear it would have any of the high-pass or equalization used elsewhere. That processing likely is extensive, considering the claimed 15Hz to 100Hz ± 3dB frequency response.
To access the processing would require more information than the owner's manual provides.
Art
The low pass filter purpose is to cut off the top end of the subwoofer to match the bottom end of the main speakers.
If using a second Linn AV5150 sub, you probably would not want to cascade the two low pass filters, so they give that option.
At any rate, sorry I mentioned it in the first place.
If using a second Linn AV5150 sub, you probably would not want to cascade the two low pass filters, so they give that option.
At any rate, sorry I mentioned it in the first place.
So I would have to clone the circuit. But the amp is rather unique in that it's a neg impedance.
This sub is fabulous sounding. Very articulate, tight bass notes, every one. I think there is a correlation to this and FR. It must be a product of it by default, no?
This sub is fabulous sounding. Very articulate, tight bass notes, every one. I think there is a correlation to this and FR. It must be a product of it by default, no?
I don't know how much the amp's negative output impedance (user adjustable from 0 ohm to -2 ohm) has to do with the sound of the sub, but it probably is not a good idea to mess with the load it is designed for by introducing any other speakers in the cabinet.
https://www.sound-au.com/project56.htm#s4
"The negative impedance amp is by its very nature unstable - the output voltage will continue to rise as the load is reduced, until at some point positive feedback exceeds negative feedback and the circuit will oscillate. Another undesirable side-effect is that distortion is increased, because negative feedback (which reduces distortion) is being counteracted by positive feedback. Again, this is a non-linear function, and the results can be unpredictable at best. For example, if the actual load impedance falls to 2 ohms at any frequency, the amplifier gain is effectively infinite (it becomes an oscillator - at full power!)"
https://www.sound-au.com/project56.htm#s4
"The negative impedance amp is by its very nature unstable - the output voltage will continue to rise as the load is reduced, until at some point positive feedback exceeds negative feedback and the circuit will oscillate. Another undesirable side-effect is that distortion is increased, because negative feedback (which reduces distortion) is being counteracted by positive feedback. Again, this is a non-linear function, and the results can be unpredictable at best. For example, if the actual load impedance falls to 2 ohms at any frequency, the amplifier gain is effectively infinite (it becomes an oscillator - at full power!)"
In all simplicity
It was a good advice to double the drivers.
Having already covered, you still need the extra airspace , drivers and power.
Basically just use another matching sub and amplifier
Which would be another Linn 5150
Otherwise as others have mentioned a Isobaric Design makes the enclosure half the size.
that is the benefit
But you loose half the efficiency and it requires double the power
that is the trade off
It was a good advice to double the drivers.
Having already covered, you still need the extra airspace , drivers and power.
Basically just use another matching sub and amplifier
Which would be another Linn 5150
Otherwise as others have mentioned a Isobaric Design makes the enclosure half the size.
that is the benefit
But you loose half the efficiency and it requires double the power
that is the trade off