Hi, a friend has c a pair of Wharfedale E30 speakers. The crossovers both have unidentifiable fried resistors. They appear large red resistors but a) no visible writing (blackened) and b) as both have failed, neither can be tested
Does anyone know the value of the resistor or have a schematic ?
many thanks
Does anyone know the value of the resistor or have a schematic ?
many thanks
An externally hosted image should be here but it was not working when we last tested it.
I can't help you with the resistor value, sry. 🙁 But I can tell you something which might help you. The Wharfedale E series was popular for being dynamically capable and they got a good efficiency. The speakers from the 70s were not nearly able to cope with power as modern speakers, especally since the power profile has changed a lot since then, much more treble, much deeper and louder bass in the music nowadays and the loudness-madness of the records rises the average power vastly. These resistors in the crossover act as a 'lifesaver' for the tweeters. If you (or rather your friend) use higher rated resistors and do the same as before, you WILL fry the tweeters.
I would just try some resistors, just get a few, like 1,5-3,9 Ohm 5W (two each), they are really cheap (less than a buck). If it sounds right, keep them, if not, try another one.
I would just try some resistors, just get a few, like 1,5-3,9 Ohm 5W (two each), they are really cheap (less than a buck). If it sounds right, keep them, if not, try another one.
A close-up would help, but if it's on the 2nd pole of the LP filter, it's probably in the range of 0.5 to 2 Ohms. Those film caps have too little ESR, and under-cuts the speaker's impedance in the treble.
If I am right, but you cannot find the value, I would guess a 1 Ohm, 10 Watt (or higher Watts) resistor will put you in a good place.
If I am right, but you cannot find the value, I would guess a 1 Ohm, 10 Watt (or higher Watts) resistor will put you in a good place.
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That's possible but unlikely. The tweeter is the same horn tweeter used in the other speakers up to the E70 with 2 bass and 2 mid drivers, so it got to have some level reduction. It's either that or a resistor/bypass cap combination to push the upper hights.
Btw, there are a lot of burnt down xo's in the E series. Not only burnt down resistors, also the capacitors. The caps age quickly, despite seemingly being foil caps. The reason is the heat from the directly adjacent resistors.
Well, only way to know is to look at reverse. I did find a Wharferdale E series specialist, you may want to reach out to him.
Home - wharfedale-e-series-speakers-specialists
Home - wharfedale-e-series-speakers-specialists
That's true. You could also contact Wharfedale at the same time, they should be able to help, too.
Wharfedale Hi-Fi -> contact us
Wharfedale Hi-Fi -> contact us