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Author Topic: 70V or Not ?  (Read 12437 times)


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Re: 70V or Not ?
« Reply #10 on: August 19, 2005, 07:31:59 pm »


The main reason for using a 70V output is more efficient transfer of power to the speakers.  Using 100m of speaker cable in an 8-ohm system depending on the wire guage, more voltage is being dropped on the cable than the speakers.  70V systems raise the voltage, causing a proportionate drop in the current (Ohm's Law).  The amount of power you can send through a wire is a function of the current not the voltage.  So if the voltage is 10 times as great, the current is 1/10th as great. Therefore the efficiency would be 10 squared or 100 times as great!!! P=I^2R.  Also speakers can be connected in parallel without having to worry about impedance. The only drawback is that frequency response below 70Hz is reduced.

Ivan Beaver

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Re: 70V or Not ?
« Reply #11 on: August 20, 2005, 05:28:28 pm »

sureshmadan wrote on Tue, 25 January 2005 16:54

Ok ! Things get even more interesting !

The EVID general brochure downloaded from the site says the EVID 3.2 are 150W 8?.
The EVID 3.2 Specification Sheet downloaded from th e site also says that these are 50W 8?.
Just spoke to EV technical support and they say these are rated for 75W continous and 150W peak performance at 8?.

Now what do you say to that ?!

Anyone have real life experience with these ?

Suresh Madan

That is exactly what Kevin Maxwell said.  What he didn't directly say (but kinda suggested) was that if you didn't have your speakers already-AND you were going to go the 70V route-THEN he suggested the model# for the ones with the transformer already inatalled-so you don't have to use an external one.
For every complicated question-there is a simple- easy to understand WRONG answer.

Can I have some more talent in the monitors--PLEASE?

Ivan Beaver
dB Audio & Video Inc.
Danley Sound Labs

Rick Johnston

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Re: 70V or Not ?
« Reply #12 on: August 22, 2005, 02:59:23 pm »

12 zones? The headend sounds like a job for IED products.

They make rack-frame dual 100-watt amp cards that will drive a 70-volt system. Each card can be bridged to become a single 200-watt amp. Signal sources can be routed to any or all zones via several different IED controllers.

You'll probably home-run the cabling for each zone back to the head-end. Might as well run them all to the head end.

The EV speakers can be ordered with transformers.

Rick Johnston

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