Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[aero]

Elliot,
It took a while but I finally had the "big" system out last weekend and got to try your paralell mono idea. It seems to have done the trick. It was not a hot or humid, long and gruelling day for the amps but it was a large audience area and everything was cranked for about 4 hours. No ODEP conditions or distortions and the system was louder. There is one remaining problem which I'll discuss with Crown. I use their IQ PIP USP2 modules in two of the ampifiers. One USP2 for high crossover and the other USP2 for low crossover (in one 2402). The processed 2402 amp processes in stereo but amplifies in mono (formerly bridged mono). The channel 2 processed signal is routed to another amp. In paralell mono the channel two, processed output is missing. I worked around it by leaving that amp in stereo. Its really a question for Crown as my literature isn't comeplete enough to show where the signal input chain is broken when paralell mono is used.
Anyway, thanks for the help, I'm almost a happy man.
aero

[Elliot Thompson]

Thats Great!

So my assumptions were correct about losing volume
due to the impedance drop.

Just keep in mind, Powerbase, Powertech, Comtech,
Microtech, & Macrotech all include the parallel
mono scheme. Just in case you happen to come across
one, and, need to go below 8 - 4 ohm minimum bridge
mono scheme.

Glad to hear everything worked out for the best.

As for PIP issue, it would be best (As you mentioned)
to relay the question to Crown. Although I use
Crown amps, I never used their PIP modules. So,
I couldn't give you any feedback on them.

Best Regards,

[rubbermatch]

I just put one 2402 per LA325 and parallel mono 'd them and voila! Now I can hear the subs farting.

[aero]

Elliot,
I had a chat with a Crown Tech. and he confirmed the whole parallel mono issue. Any impedance dips below 4 ohms are problematic. This is not what a previous Crown tech. said long ago. He said that those ratings were "nominal" and weren't the cause of my problems. Anyway, this guy was good. He even told me about a low cost 20mA current loop converter from Blackbox that will allow me to interface with their IQ system. I'll need it to program the extra PIP card I need to make this all work.
Thanks again.
AERO

[Elliot Thompson]

Yeah.

Those stuff happen. Do yourself a favor, and,
read the MA 2402 manual, from front to back.

It seems like Crown won't be offering so much
information in their amplifier manuals any
longer. Their new models basically, tells you
the A B C's, and, thats it.

Seeing that the Macrotech is a 20+ year design,
I would imagine a few representitives from Crown's
Tech Service will not be as familiar with them
like the CE 4000.

And with the I Tech being the new Top Of The
Line, I really doubt they are training the
new staff on the Macrotech Series.

The Parallel Mono scheme is not on their
K, CE, XS, nor I Tech series. So, given
another 10 years from today, the new techs
may not have a clue why the IOC light, stays
lit when it is in Parallel Mono mode.

Best Regards,