albert
Junior Member
Living in Sthwst Florida
Posts: 68 
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Post by albert on Nov 3, 2023 11:29:51 GMT
can i use 4 ohm speakers when replacing base speakers
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Post by jukenorman on Nov 3, 2023 19:39:22 GMT
What does it say in the manual? I don't have an R88 manual but if it's the same as the R87, you would't want to be installing 4 ohm ones!
Norman
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Post by boomboombill on Nov 4, 2023 14:46:55 GMT
The manual states 30 ohm speakers are fitted. I have recently replaced mine with a pair of Fenton 10 inch 8 ohm 125 watt drivers with no ill effects to the amplifier.
I would think that 4 ohm speakers would be too low impedence and may put undue stress on the amplifiers output stages.
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Post by jukenorman on Nov 4, 2023 16:33:57 GMT
It wasn't the amplifier I was concerned about, it was the sound balance between the lower and upper speakers. The output transformer assy pretty much protects the amp outputs.
The two 10 inch speakers (30 ohm) are wired in parallel and see the summation of both stereo channels. On the face of it, it would seem better to wire the replacement 8 ohm loudspeakers in series to present approximately the same loudspeaker impedence. However these Fentons do appear to be quite inefficient. How does your jukebox sound - is it bass heavy?
Norman.
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Post by boomboombill on Nov 6, 2023 10:05:43 GMT
No, it's not particularly bass heavy at all, in fact the sound seems more balanced and clearer. To be fair though the foams on the original speakers were pretty well shot.
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Post by jukenorman on Nov 7, 2023 9:22:54 GMT
Just for the record, replacing perished foam surrounds on loudspeakers is much more straightforward that one might imagine and well within the capabilities of the average DIY-er.
Norman.
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