Hi,
What is theoretically possible has little to do with what is practical.
Yes I could design a bridged class A amplifier for a 2 ohm load,
but in doing so I'd know its a hopelessly impractical endeavour.
rgds, sreten.
What is theoretically possible has little to do with what is practical.
Yes I could design a bridged class A amplifier for a 2 ohm load,
but in doing so I'd know its a hopelessly impractical endeavour.
rgds, sreten.
If you have a 4 ohm amplifier you can run it into 2 ohms up to half power.
If you have a 8 ohm amplifier you can run it into 2 ohms up to quarter power.
As I type I have 7 speakers playing off the same 4 ohm amplifier in parallel.
Approx 1 ohm.
If you have a 8 ohm amplifier you can run it into 2 ohms up to quarter power.
As I type I have 7 speakers playing off the same 4 ohm amplifier in parallel.
Approx 1 ohm.
Nusnud, yes "additional current" is needed to drive low Z loads.
This can be seen simply by using ohms law(s) and changing the R value down as the voltage value is kept the same. The current increases, with the same signal driving, which is the same as saying the voltage is kept the same as the load Z drops.
The question then becomes not IF the amp will drive the low Z load, but how does it sound on your speakers when it does this. If you feel that almost all "properly designed amps" are indistinguishable when listened to, then this simplifies your selection process.
_-_-
This can be seen simply by using ohms law(s) and changing the R value down as the voltage value is kept the same. The current increases, with the same signal driving, which is the same as saying the voltage is kept the same as the load Z drops.
The question then becomes not IF the amp will drive the low Z load, but how does it sound on your speakers when it does this. If you feel that almost all "properly designed amps" are indistinguishable when listened to, then this simplifies your selection process.
_-_-
I think I'd just shoot for something big, old and heavy from Carver, QSC, Crown, whatever.
The old boat-anchor PA amps were designed to take some stick day in, day out, so they're what I'd immediately spring for if I wanted something that'll shove 2ohm loads all day.
FWIW, the Crown Macrotech series can operate in parallel mono for increased current capability, gaining the ability to drive down to 1ohm without pushing the amplifier outside its design limits.
A pair of Macrotechs (even the 1200 or 2400w ones) would be pretty damn impressive IMO.
Chris
The old boat-anchor PA amps were designed to take some stick day in, day out, so they're what I'd immediately spring for if I wanted something that'll shove 2ohm loads all day.
FWIW, the Crown Macrotech series can operate in parallel mono for increased current capability, gaining the ability to drive down to 1ohm without pushing the amplifier outside its design limits.
A pair of Macrotechs (even the 1200 or 2400w ones) would be pretty damn impressive IMO.
Chris
Actually a bridged amp for a 2 ohm load might be a cool endeavor.
Maybe lower Z... drive your ribbons direct!!
The key to it would be to use high current but lowish Vce devices - presumably inexpensive for that reason... that and a very hefty power supply.
It comes off sort of like a lowish voltage very high current linear regulated power supply in some ways... I've got a 5volt 50amp linear regulated supply sitting on the shelf here. Had some thoughts of resistance welding with it... 😀
Maybe lower Z... drive your ribbons direct!!
The key to it would be to use high current but lowish Vce devices - presumably inexpensive for that reason... that and a very hefty power supply.
It comes off sort of like a lowish voltage very high current linear regulated power supply in some ways... I've got a 5volt 50amp linear regulated supply sitting on the shelf here. Had some thoughts of resistance welding with it... 😀
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