I have a whole house music system, which requires, 25 ohm speakers. I have two blown outdoor speakers, which I would like to replace with Bose 151 4ohm speakers. Can I use an Impedance Matching Transformer? I have some experience, but need some advise on which one to use and how to basically connect it.

 

Interesting..... I could not find any one selling a 25 ohm speakers, nor any whole home music system that uses 25 ohm speakers. Are you sure it is a 25 ohm system?

Do your speakers have matching transformers built on them?

 

most house systems are 8 ohm configurations,, I am an automotive electric tech. and I have used transformers to change impedance in extreme situations.. although you do raise your impendance you sacrifice ALOT of power doing so.. are you able to series 2 8 ohm speakers per side to end up with 16 ohms,,series a third one in there and you get 24 ohms

 

yes 25 ohm no matching transformer. the system is M&S Music & Sound they were bought out by Linear corp

 

I think you are looking for 25 volt matching transformers.
http://www.krp.com/10-WATT-25-VOLT-MATCHING-LINE-TRANSFORMERS-WITH-LEADS-_p_1202.html

Might look at ebay

 

Yes, it sounds like a 25 volt system, which uses a transformer at each speaker, not a 25 ohm system.

 

Yes, it sounds like a 25 volt system, which uses a transformer at each speaker, not a 25 ohm system.

no! I know ohm's law. I learned it 40 years ago, and I can read.

 

I think you are looking for 25 volt matching transformers.
http://www.krp.com/10-WATT-25-VOLT-MATCHING-LINE-TRANSFORMERS-WITH-LEADS-_p_1202.html

Might look at ebay

Thanks for trying, but I wrote 25 ohm, not 25 volt. Music intercom systems are not typical.

 

most house systems are 8 ohm configurations,, I am an automotive electric tech. and I have used transformers to change impedance in extreme situations.. although you do raise your impendance you sacrifice ALOT of power doing so.. are you able to series 2 8 ohm speakers per side to end up with 16 ohms,,series a third one in there and you get 24 ohms

Thanks for the reply. all reply's so far are telling me I do not know what I am writing. I have been doing electrical work for forty years. I hold a state contractors license, and I went to school for electronics, and I can build computers. I am not a genius, but I am also not stupid.

 

We are not questioning what you are writing. But maybe what you are reading. 25 volt systems are often used for long runs from the amplifier and require a special amp. Kind of sounds like you.
Can you show a picture of the bad speaker that makes you think it is 25 ohm?

Try looking at Nu Tone speakers.

 

Yes, you can use an impedance matching transformer 25:4, with the 4 ohm winding connected to the speaker.

 

We are not questioning what you are writing. But maybe what you are reading. 25 volt systems are often used for long runs from the amplifier and require a special amp. Kind of sounds like you.
Can you show a picture of the bad speaker that makes you think it is 25 ohm?

Try looking at Nu Tone speakers.

Nutone outdoor speakers are 45 ohm. I could connect two in parallel, but they are only weather resistant, not proof, which I need. Thanks anyway

 

the system is an intercom system, those use special made high impedance speakers so they work as microphones. I dont know of a source for 24 to 4 ohm impedance transformers.
if you use a 25 volt audio transformer connected to the d25 watt tap, it will match 4 ohms to 25 ohms.

 

Google is your friend. "25 ohm speaker" turns up many hits; including this one from NuTone.