tubbytech Posted May 3, 2012 Share Posted May 3, 2012 Hey Guys I have just purchased some speakers from offline and they come with a 70v line tap or 8ohm setting..... I would like to but three of these speakers on one side of an amplifier, now I understand that if I do that then I will drop the Ohm rating to just over 2.6. Do you think it would make any difference if I installed a 100v line transformer to put all the speakers on the same side of the amp? as these speakers say 70v line and im struggling to find a 70v line transformer Many Thanks Link to comment Share on other sites More sharing options...
Brian Posted May 3, 2012 Share Posted May 3, 2012 Does your amp have a 100v output? Link to comment Share on other sites More sharing options...
dbuckley Posted May 4, 2012 Share Posted May 4, 2012 70V is American, whereas the rest of the world uses 100V. If the amp has 100V out then I would give that a go. If it hasn't and the amp is 4 ohm minimum then you have problems. How powerful is the amp and the speakers? Link to comment Share on other sites More sharing options...
tubbytech Posted May 4, 2012 Author Share Posted May 4, 2012 The amp does have a 100v line output on it... Do you not think that this would blow the speakers as they are only 70v Link to comment Share on other sites More sharing options...
soundspider Posted May 4, 2012 Share Posted May 4, 2012 Could you not connect two of the speakers in series and then the other one in parallel at the low impedence setting? Total resistance would be 5.333 ohm if my calculations are right? Or is that not possible with your wiring? Alan Link to comment Share on other sites More sharing options...
dbuckley Posted May 4, 2012 Share Posted May 4, 2012 The amplifier will produce 100V across the terminals at full output. Less voltage at lower levels. Which is why I suspect it'll just work, except at extremes. Link to comment Share on other sites More sharing options...
MarkPAman Posted May 4, 2012 Share Posted May 4, 2012 Could you not connect two of the speakers in series and then the other one in parallel at the low impedence setting? Total resistance would be 5.333 ohm if my calculations are right? Or is that not possible with your wiring? The problem with this arrangement is that one speaker will get four times the power of the other two, and therefore be 6dB louder. (If my maths/memory is correct) Link to comment Share on other sites More sharing options...
Owain Posted May 4, 2012 Share Posted May 4, 2012 Tap the 70V speakers at no more than half the speaker's maximum rating when feeding from 100V. The power reaching the speaker coil will be about right. also remember that eg a 50 watt tapped 70V speaker will appear as 100 watt to the amp. Although as dbuckley says, it'll probably work anyway, except at extremes. Link to comment Share on other sites More sharing options...
tubbytech Posted May 8, 2012 Author Share Posted May 8, 2012 Thanks for your help guys!!! Link to comment Share on other sites More sharing options...
boatman Posted May 8, 2012 Share Posted May 8, 2012 If you're doing anything with 70.7V/100V line equipment you should read this Rane application note. Scroll down to the end and you'll find a link to a '.pdf' version for download. Link to comment Share on other sites More sharing options...
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