@madsoundguy So is there a general engineer's rule of thumb of when to use 70V over low impedance? I'm imagining a rule of thumb that goes something like this: you want to keep the total line impedance under 1/8th of the speakers impedance while maintaining a realistic wire gauge. Power and distance are the important hidden factors in that rule of thumb. Thank you very much for sharing your invaluable experience and knowledge!
My local made pa amplifier output volts are 95v @ 8ohms. (450 watt @ 8 ohms) it has no output transformer. The dc supply rail is 95+95. Can i drive 100v line speakers on it? how many speakers i can drive on it?
hello iam doods from the philippines i have a question i have 4 units 150 watts 16 ohms horn speakers connecting to 100v amplifier with audio matching transformer it is possible to tap the secondary to 8ohms to a 16ohms?
Ah i see, you want to get rid of the impedance matching transformer? i presume that amp has 2 channels out? You should be able to put put 2 horns in parallel to give you a total of 8 ohms for that pair. put that pair on one channel out of the 8 Ohm amp. another pair on the other amp If your amp has one out: I think if you wanted to convert your amp to 16 ohms, you would either have to manually add turns on that amplifier's output transformer(assuming it has an output transformer) Or just have a single 8 ohm to 16 ohm impedance matching output transformer. that may be hard to find at 600W but you may be able to do the math and find a transformer with 1:1414 turns ratio. www.everythingrf.com/rf-calculators/rf-transformer-calculator If you were to buy a non audio rated transformer it would still cost you, in dollars and in sound quality. Digikey has something like what you would need but these are only to get you thinking; i make no claim that these would suit you well... (i.e. Do the math! lol): www.digikey.com/en/products/filter/power-transformers/164?s=N4IgjCBcoKwBxyqAxlAZgQwDYGcCmANCAPZQDa4cMAbGAMwhEBMMAnHTA87WEwOyMQTagBY6vQfxhhqMSXz7U6A5nyojEzBAAY4rSa3ZwVIOtrB8mIwWbOiQAXSIAHAC5QQAZVcAnAJYAdgDmIAC%2BoUTUSCB%2BACYeALRg5oJuHoKuAJ7OeB4YOKjhQA
You can connect secondaries of 2 transformers in series (check polarity!) and connect one 16 Ohm speaker to them. So you need 8 transformers rated at 75 (plus) Watt, 8 Ohm load secondary.
This was very helpful, very well explained and to the point. Thanks!
Glad it was helpful - thanks for your feedback! 😁
Nice video! Thanks a lot for the explanation. It was so helpful for me, because I’m starting in this world of commercial sound.
@madsoundguy So is there a general engineer's rule of thumb of when to use 70V over low impedance?
I'm imagining a rule of thumb that goes something like this: you want to keep the total line impedance under 1/8th of the speakers impedance while maintaining a realistic wire gauge. Power and distance are the important hidden factors in that rule of thumb.
Thank you very much for sharing your invaluable experience and knowledge!
My local made pa amplifier output volts are 95v @ 8ohms. (450 watt @ 8 ohms)
it has no output transformer.
The dc supply rail is 95+95.
Can i drive 100v line speakers on it?
how many speakers i can drive on it?
hello iam doods from the philippines i have a question i have 4 units 150 watts 16 ohms horn speakers connecting to 100v amplifier with audio matching transformer it is possible to tap the secondary to 8ohms to a 16ohms?
Ah i see, you want to get rid of the impedance matching transformer?
i presume that amp has 2 channels out? You should be able to put put 2 horns in parallel to give you a total of 8 ohms for that pair. put that pair on one channel out of the 8 Ohm amp. another pair on the other amp
If your amp has one out: I think if you wanted to convert your amp to 16 ohms, you would either have to manually add turns on that amplifier's output transformer(assuming it has an output transformer) Or just have a single 8 ohm to 16 ohm impedance matching output transformer. that may be hard to find at 600W but you may be able to do the math and find a transformer with 1:1414 turns ratio. www.everythingrf.com/rf-calculators/rf-transformer-calculator
If you were to buy a non audio rated transformer it would still cost you, in dollars and in sound quality. Digikey has something like what you would need but these are only to get you thinking; i make no claim that these would suit you well... (i.e. Do the math! lol): www.digikey.com/en/products/filter/power-transformers/164?s=N4IgjCBcoKwBxyqAxlAZgQwDYGcCmANCAPZQDa4cMAbGAMwhEBMMAnHTA87WEwOyMQTagBY6vQfxhhqMSXz7U6A5nyojEzBAAY4rSa3ZwVIOtrB8mIwWbOiQAXSIAHAC5QQAZVcAnAJYAdgDmIAC%2BoUTUSCB%2BACYeALRg5oJuHoKuAJ7OeB4YOKjhQA
You can connect secondaries of 2 transformers in series (check polarity!) and connect one 16 Ohm speaker to them. So you need 8 transformers rated at 75 (plus) Watt, 8 Ohm load secondary.