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Multi-Way Conventional loudspeakers with crossovers

KEF Q500 Crossover upgrade
KEF Q500 Crossover upgrade
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Old 29th December 2015, 07:16 PM   #1
rdsu is offline rdsu  Portugal
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Default KEF Q500 Crossover upgrade

Hi,

I want to upgrade the crossover of my KEF Q500 spealkers:

Click the image to open in full size.

It's a 2.5 way bass reflex.

It has a bilopar M.D.L. 1000uF 50V, and I would like to know if I can change it to a Nichicon KZ 1000uF 50V, or I must use a bipolar cap?

Thanks!
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Old 29th December 2015, 09:37 PM   #2
Face is offline Face  United States
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https://www.madisoundspeakerstore.co...trolytic-caps/
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Old 30th December 2015, 12:44 AM   #3
rdsu is offline rdsu  Portugal
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Thanks.

Then I must use a bipolar cap...
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Old 30th December 2015, 01:57 AM   #4
rdsu is offline rdsu  Portugal
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Do you know where I buy these in Europe?
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Old 30th December 2015, 02:21 AM   #5
rdsu is offline rdsu  Portugal
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The shippment of madisound is really expensive.

Can I use one of these options:

3x Mundorf Ecap 330uF 63V

or

3x Mundorf Ecap 330uF 63V
1x Mundorf Ecap 10uF 100V

?
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Old 30th December 2015, 03:54 AM   #6
eriksquires is offline eriksquires  United States
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I assume the 1,000 uF cap is in your woofer? If so, you are starting with the wrong parts.

In any event, 1 x 10uF cap won't possibly work. :-) Did you mean 1x Mundorf Ecap 1000uF ? that would work.

In order:

1. Change the resistors to Mills non-inductive wirewound. Depending on the total wattage, you may even be able to cut the resistor count down to 1 instead of 2.
2. Change the film cap to Mundorf MKP
3. Upgrade the solid core inductor to either a nice Jentzen air core or P-Core.
4. Upgrade the 1,000uF cap to Mundorf Ecap (3 x 330uF) they're pretty cheap.

You may need an LC meter, I've seen them around cheaply, around $30. Also built into Dauton Audio's DATS.
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Old 30th December 2015, 05:44 AM   #7
Face is offline Face  United States
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Quote:
Originally Posted by eriksquires View Post
I assume the 1,000 uF cap is in your woofer? If so, you are starting with the wrong parts.

In any event, 1 x 10uF cap won't possibly work. :-) Did you mean 1x Mundorf Ecap 1000uF ? that would work.

In order:

1. Change the resistors to Mills non-inductive wirewound. Depending on the total wattage, you may even be able to cut the resistor count down to 1 instead of 2.
2. Change the film cap to Mundorf MKP
3. Upgrade the solid core inductor to either a nice Jentzen air core or P-Core.
4. Upgrade the 1,000uF cap to Mundorf Ecap (3 x 330uF) they're pretty cheap.

You may need an LC meter, I've seen them around cheaply, around $30. Also built into Dauton Audio's DATS.
If you do decide to upgrade the coils, please make sure the new coils have a DCR that is close to the factory coils, or you can have a negative effect on transfer function and driver levels.
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Old 30th December 2015, 10:38 AM   #8
rdsu is offline rdsu  Portugal
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Quote:
Originally Posted by eriksquires View Post
I assume the 1,000 uF cap is in your woofer? If so, you are starting with the wrong parts.
Or to limit LF to mid-woofers, and let it go to woofer?
I still don't know how this 2.5 way crossover works.

Quote:
Originally Posted by eriksquires View Post
In any event, 1 x 10uF cap won't possibly work. :-) Did you mean 1x Mundorf Ecap 1000uF ? that would work.
The 1x10uF cap is to make the 1000uF.
3x330+10=1000uF.

Quote:
Originally Posted by eriksquires View Post
In order:

1. Change the resistors to Mills non-inductive wirewound. Depending on the total wattage, you may even be able to cut the resistor count down to 1 instead of 2.
2. Change the film cap to Mundorf MKP
3. Upgrade the solid core inductor to either a nice Jentzen air core or P-Core.
4. Upgrade the 1,000uF cap to Mundorf Ecap (3 x 330uF) they're pretty cheap.

You may need an LC meter, I've seen them around cheaply, around Also built into Dauton Audio's DATS.
I forgot to mention that I already made this, except the inductors.

Thanks
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Old 30th December 2015, 10:38 AM   #9
rdsu is offline rdsu  Portugal
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Quote:
Originally Posted by Face View Post
If you do decide to upgrade the coils, please make sure the new coils have a DCR that is close to the factory coils, or you can have a negative effect on transfer function and driver levels.
Thanks for you tip.
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Old 30th December 2015, 11:03 AM   #10
eriksquires is offline eriksquires  United States
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Quote:
Originally Posted by Face View Post
If you do decide to upgrade the coils, please make sure the new coils have a DCR that is close to the factory coils, or you can have a negative effect on transfer function and driver levels.
If he uses equivalent coils, how is he going to hear a difference?

You are right, of course, but I would say the bigger danger is the woofer levels changing. Without appropriate measurements it's going to be hard to tell what such a change might do, or if he'd be pleased with the result.

Best,

Erik
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