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100v amplifier on 70v speakers

post #1 of 8
Thread Starter 
Dear all,

I`m new to 70/100v speaker systems and need some help.

Is it safe to connect a 100v amplifier to 70v speakers?


Edited by jeroen@bmb - 5/15/13 at 2:57am
post #2 of 8
Have you contacted terra directly about this issue?

Current commercial audio Crown amplifiers support both voltages. Which amplifier are you using?
post #3 of 8
Thread Starter 
Hi,

Yes I contacted Terra, they think adding a 70v amplifier to 100V speakers systems is no problem but a 100v amplifier on a 70v speaker system might cause trouble.
Their respond seem to me that they are not realy sure thats why I post here.

At this moment I dont have an install so there is no amplifier specified yet, but I just want to know for the future incase an install allready has a 100v amplifier.

Long time ago at school I learned it didnt matter as long as the total wattage of the speaker line dindnt pass the wattage output of the amplifier it should be good to go.
But that was a long time ago and I`m not realy sure.

Thanks for helping in advance!
post #4 of 8
It will depend upon how much design margin the 70 V speakers have. The 70 V and 100 V ratings typically refer to the max voltage, so a 70 V speaker must be able to handle 100 V peaks without damage. Meaning transformers and drivers...
post #5 of 8

You can use it as the transformers work at different voltages.  The rated wattage is ~doubled, so if you set the speaker to 16 watts you need to calculate for 32 watts if using multiple speakers and calculating to stay within your wattage limit of the amplifier.  Also, using a 70V speaker with a 100V amplifier will half the rated low frequency extension.  So if the speaker is rated 70hz it will now be only able to go down to ~140hz before distorting.  In general you are better off matching it if possible, but the speaker will work.

 

Another option would be to set the speaker to 8 ohm and use step down transformer for 100V.

post #6 of 8
Thread Starter 
Quote:
Originally Posted by BobL View Post

You can use it as the transformers work at different voltages.  The rated wattage is ~doubled, so if you set the speaker to 16 watts you need to calculate for 32 watts if using multiple speakers and calculating to stay within your wattage limit of the amplifier.  Also, using a 70V speaker with a 100V amplifier will half the rated low frequency extension.  So if the speaker is rated 70hz it will now be only able to go down to ~140hz before distorting.  In general you are better off matching it if possible, but the speaker will work.

Another option would be to set the speaker to 8 ohm and use step down transformer for 100V.

Thanks for your great answer! I didn't know that the low freq would be half rated, does that only apply to using a 100v amp with 70v speakers or also with a 70v amp combined with 70v speakers?
post #7 of 8

A 70V amp and a 70V speaker are fine, that is how it is designed to be used and the speaker should work within its rated frequency response.  Only when you are mixing the voltage ratings does the wattage and frequency range change, it is just the way transformers work.

post #8 of 8
Thread Starter 
Ok thanks for your clear answer.
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