FairTax Posted January 31, 2011 Report Share Posted January 31, 2011 They used to do it for classrooms, and I have a similar program for 16 listeners. I'm on a small budget and can't afford a headphone amplifier. I want to use an old stereo amplifier of about 5-10 or 20 watts (which is really two amps in one box) on a TV output source. A switch on the panel will unify the stereo to mono left amp, and right amp. I have a Telex model 753 mono passive headphone splitter with 8 each 1/4" mono inputs, for one channel, and parts to make an identical splitter for the other channel. (there's not even so much as a resistor in the box, just wire and phone plugs) Now, with two splitters on Left and Right speaker output channels, I plug in up to 16 mono classroom headphones. (12 or 14 sets will be different value than all 16) These oldies are 600 ohm beasts made for classroom use (they don't do stereo, circa 1962). My issue is, with an 8 ohm amplifier this load may reduce the load to 1 ohm??? Is that pushing it way too far??? The audio program is only "talking" no loud music. It's like having 16 tiny speakers in parallel on each channel. I may have to test it at VERY low volume. IS THIS THE BEST WAY TO DO THIS??? please advise. Quote Link to comment Share on other sites More sharing options...
acidbasement Posted January 31, 2011 Report Share Posted January 31, 2011 In the spirit of being nice I suggest you read your welcome pm for clues as to why few people on this forum will want to help you, then register on head-fi.org and ask your question there. Good luck with not frying your amp and/or headphones. Quote Link to comment Share on other sites More sharing options...
boomana Posted January 31, 2011 Report Share Posted January 31, 2011 There is no longer a welcome pm. Quote Link to comment Share on other sites More sharing options...
manaox2 Posted January 31, 2011 Report Share Posted January 31, 2011 (edited) tempted to say to just get an FM transmitter and have them bring in something like portable FM radios. $10 a radio on amazon plus transmitter really adds up, but maybe they have their own? Here is this: http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=AM1C http://www.amazon.com/Sony-ICF-S10MK2-Pocket-Radio-Silver/dp/B00020S7XK BTW, in my classroom, we use computers with headphone jacks or a speaker when everyone is listening to the same thing. Edited January 31, 2011 by manaox2 Quote Link to comment Share on other sites More sharing options...
justin Posted January 31, 2011 Report Share Posted January 31, 2011 add a resistor in series with each headphone Quote Link to comment Share on other sites More sharing options...
mypasswordis Posted January 31, 2011 Report Share Posted January 31, 2011 At 600 ohms 16 in parallel is 37.5 ohms, not 1??? Quote Link to comment Share on other sites More sharing options...
Dusty Chalk Posted February 1, 2011 Report Share Posted February 1, 2011 Shouldn't there be a way to adapt the Grado circuit to this? Quote Link to comment Share on other sites More sharing options...
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