Hello,
This is my 1st post, so forgive me if I step out of protocol. I own a vintage Philips wired intercom (made in France) that has served me well for more than 30 years. The outside speakers have given recently up the ghost. The sound quality is nothing short of incredible with the original good speakers. While I did manage to find the original engineering spec sheets for the speakers - (see attachment), and have contacted Philips to no avail, the closest replacement speakers I've found are two inch round, and I think those have already been sold on Ebay. My question is could I expect better results with 16 ohm, or 45 ohm versions shored up with resistors to at least come close to the proper impedance ?. Even better, does anyone know where I might find speakers with the exact attributes as the originals ?. The resonate frequency of the originals is 250 Hz, but at this point I'd gladly settle for matching the specs shown in the title of this post. I'd have no problem retrofitting speakers with square basket frames providing the frame is no larger than 3.5 x 3.5 inches. My main concern using resistors to shore up the impedance is ending up with greatly reduced volume &/or distortion. I am a retired audio tech who should know the effects of matching speaker impedance with resistors - kind of embarrassing. I do know impedance changes with frequency, but this is a narrow (voice) band I'm dealing with.
Many Thanks,
Munson48*w7
This is my 1st post, so forgive me if I step out of protocol. I own a vintage Philips wired intercom (made in France) that has served me well for more than 30 years. The outside speakers have given recently up the ghost. The sound quality is nothing short of incredible with the original good speakers. While I did manage to find the original engineering spec sheets for the speakers - (see attachment), and have contacted Philips to no avail, the closest replacement speakers I've found are two inch round, and I think those have already been sold on Ebay. My question is could I expect better results with 16 ohm, or 45 ohm versions shored up with resistors to at least come close to the proper impedance ?. Even better, does anyone know where I might find speakers with the exact attributes as the originals ?. The resonate frequency of the originals is 250 Hz, but at this point I'd gladly settle for matching the specs shown in the title of this post. I'd have no problem retrofitting speakers with square basket frames providing the frame is no larger than 3.5 x 3.5 inches. My main concern using resistors to shore up the impedance is ending up with greatly reduced volume &/or distortion. I am a retired audio tech who should know the effects of matching speaker impedance with resistors - kind of embarrassing. I do know impedance changes with frequency, but this is a narrow (voice) band I'm dealing with.
Many Thanks,
Munson48*w7
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