Power amp for jbl 4343

[Mr. Widget]

Still on the hunt for good amplifications options for these 4343's so if anyone's had particularly good results...

Why not get the Perreaux amp you mentioned earlier? I've heard the 4343s sound quite good with far less.


Widget

[Goldjazz]

Why not get the Perreaux amp you mentioned earlier? I've heard the 4343s sound quite good with far less.


Widget

Yeah I hesitated because ive not heard much about the perreaux. Digging through past threads there are a couple of positive accounts of them though.

[hjames]

Yeah I hesitated because ive not heard much about the perreaux. Digging through past threads there are a couple of positive accounts of them though.

Ask Opimax here on the forum. He's got Perreaux gear for his 250s.
They are powerful and sound very nice.

[martin2395]

I'd never buy an old Perraux poweramp, if the outputs blow (they have no protection) then it's a doorstop.

My choice would be Bryston 3B/4B and then buy the most recent version you can afford.

[hjames]

I'd never buy an old Perraux poweramp, if the outputs blow (they have no protection) then it's a doorstop.

My choice would be Bryston 3B/4B and then buy the most recent version you can afford.

Like any old amp, have it checked and have caps replaced as needed.
If the semiconductors blow, have it rebuilt by a pro ...

[Goldjazz]

Ask Opimax here on the forum. He's got Perreaux gear for his 250s.
They are powerful and sound very nice.

Thanks, will do

[Goldjazz]

I'd never buy an old Perraux poweramp, if the outputs blow (they have no protection) then it's a doorstop.

My choice would be Bryston 3B/4B and then buy the most recent version you can afford.

Thanks for the advice. I've sent the Perreaux amp specs to a trusted tech I've used before, see what he thinks, but thanks for the word of caution regarding lack of protection.

I hadn't considered Bryston before, but the specs of the 4b seem to tick all the boxes. The only issue is availability of them where I am, there's a few available worldwide so I'll need to weigh up shipping cost and power transformers but this could be an option.

[Allanvh5150]

I have worked on many Perreaux amps and I have never seen an output device fail into a short circuit. The ones I have seen always fail into an open circuit. In general, mosfets do not require and protection circuits because they have a positive temperature coefficient which means when they increase in temperature, the resistance of the junction increases which in turn brings the power dissipation down, self regulation.

The older Perreaux amps are brilliant at what they do.

Allan.

[Goldjazz]

I have worked on many Perreaux amps and I have never seen an output device fail into a short circuit. The ones I have seen always fail into an open circuit. In general, mosfets do not require and protection circuits because they have a positive temperature coefficient which means when they increase in temperature, the resistance of the junction increases which in turn brings the power dissipation down, self regulation.

The older Perreaux amps are brilliant at what they do.

Allan.

Cheers Allan your comments give me a bit more confidence, but a bit over my head I must admit. If my tech is also positive I may give it a go. Thanks

[Bill Shenefelt]

Don't bother with such big, expensive amps. BiAamping is much more worthwile with 4343's.
I'm powering mine with Krell KSA-50 (highs) and Crown K2 is powering the woofers. Believe me 50W is plenty for the mid/high section, it's only the 2231/2235 that likes power.
The bass is also MUCH better with bi-amping, my woofers are connected directly to the K2

I have home built 4343 monitors with a Marchand crossover using a Heathkit 250w/channel on the 136A bass drivers and an Amber 100 w/channel amp on the top end with JBL designed passives and JBL supplied components for the passive upper crossovers. What slopes and what frequencies are you using in the Marchand? I have never gotten my 4343's to sound as good to me as my initial built L-300's. The 800 cps crossover to the horn on the L-300 seemed to allow better impact from the bass driver. I would sure like to get things sounding better though. Hate to waste money to buy coils and caps to go passive on the bass to mid crossover expecially if the active performs better.