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What is the correct impedance for Marantz Imperial 6 phenolic tweeters?

Jens Sinding · 2022-07-02T14:57:19+00:00

I recently found a pair of Imperial 6G’s for a very reasonable price (about 40$). The tweeters had suffered the fingers of destruction and were essentially missing the dust cap, so I ordered the supposedly drop in replacement, the GRS PRT-8 phenolic tweeter. However, the impedance of the old tweeters measure at 4.7 Ohm, whereas the GRS measure at 7.8 Ohm (it is specified as an 8 Ohm unit). In direct comparison the old tweeters sound better, so I suspect that I may have the wrong units. All things being equal, the old tweeters should be louder, or are other factors in play? Does anyone have any experience with this replacement, and what was the impedance of your old tweeters? The crossover is rather interesting with a level switch for the tweeter. In neutral, there is a 3 ohm resistor in series, and a 8 ohm resistor in parallel with the tweeter. In high, the 3 ohm resistor is placed in parallel with a 1 ohm resistor, reducing the resistance in series with the tweeter an thus increasing the volume.. In low, an extra 6 ohm resistor is placed in parallel with the tweeter, thus allowing more energy to bypass the tweeter. I have considered removing the 3 ohm resistor, or increasing the 8 ohm resistor, to adjust for the tweeter impedance, but I think that it will be better to get some advice from wiser karmists first :)

Thread starter Jens Sinding
Start date Jul 2, 2022
Tags

imperial 6 marantz

WaynerN

Addicted Member

Jul 3, 2022

The phenolic tweeter sold by Parts Express is made by GRS. I've used them in a pair of DLK 1 1/2 speakers with good results.

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