I own a pair of Infiniti RS3b and they eat power amp's. The 1st one was a Yamaha M80 (1 ch exploded after a few years), the 2nd a QSC MX-700 very solid but harsh sounding. I sold it to a DJ. 3th a Marantz SM-7 died after 6 months, repaired and again......RIP.
So what's up ....A PA amp (QSC MX700) to modify or DIY-ing one.
For the last solution I have 10ea BDX66A and 10ea BDX67A plus 2 main transformers 550VA/80V (or even 1400VA/80V) to construct 2 mono blocks.
Your ideas are welcome.
Philippe
So what's up ....A PA amp (QSC MX700) to modify or DIY-ing one.
For the last solution I have 10ea BDX66A and 10ea BDX67A plus 2 main transformers 550VA/80V (or even 1400VA/80V) to construct 2 mono blocks.
Your ideas are welcome.
Philippe
Hey
Those are nominally 4-ohms but I think they can dip below that depending on the source material.
There was a thread way back where someone had the bigger Infinity refrences that had multiple drivers for each way, except a single mid-bass coupler. That one ate amps, too, actually the amps clipped and ate tweeters which is worse!
The fix was to get rid of the passive crossover, build a 4-way electronic crossover and four-way amps. I think they used an off the shelf for the woofers, then had a low-power amp for the mid-bass, but the mids and tweeters each needed a custom amp cuz wring each group in parallel made both of them less than 1-ohm! But it was low-voltage so easy to make a high-current amp for each band.
The result was stunning from what the thread said.
At the very least, you need an amp rated for 4-ohms or even 2-ohms with a ton of power. better would be to split it in two for bass and the rest. Then the tweeters won'ty get killed when the bass signal is really high.
Those are nominally 4-ohms but I think they can dip below that depending on the source material.
There was a thread way back where someone had the bigger Infinity refrences that had multiple drivers for each way, except a single mid-bass coupler. That one ate amps, too, actually the amps clipped and ate tweeters which is worse!
The fix was to get rid of the passive crossover, build a 4-way electronic crossover and four-way amps. I think they used an off the shelf for the woofers, then had a low-power amp for the mid-bass, but the mids and tweeters each needed a custom amp cuz wring each group in parallel made both of them less than 1-ohm! But it was low-voltage so easy to make a high-current amp for each band.
The result was stunning from what the thread said.
At the very least, you need an amp rated for 4-ohms or even 2-ohms with a ton of power. better would be to split it in two for bass and the rest. Then the tweeters won'ty get killed when the bass signal is really high.
I have a pair of RS5b’s, which I ran off AEM6000 derived Lateral MOSFET power amps for quite a while. The key to success with big Infinity speakers is running a lower rail voltage than you might otherwise, or adding transistors with higher rails - their impedance drops pretty low. Lateral MOSFETs are pretty bulletproof.
Also, these are not new speakers - it’s probably a good idea to check the caps in the crossovers aren’t stuffed, as that in turn could be killing amps.
Also, these are not new speakers - it’s probably a good idea to check the caps in the crossovers aren’t stuffed, as that in turn could be killing amps.
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