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Old 10th April 2015, 09:29 AM   #1
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Default wharfdale linton 3xp. no mid response. recap?

I have 6 wharfdale linton 3xp's. at least one of them has very little mid, ive connected the mid to the tweeter output and the driver works, but on the mid connection the sound is very faint.

also the crossovers have the original elcap capacitors!!! ive tried finding replacements but it would seem the only thing I can use is some motor 250v caps.

really need advice on best way to get them back to running order. ive replaced the tweeters already with some from maplins by audax.

is it worth recapping them?
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Old 10th April 2015, 11:49 AM   #2
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You can connect the midranges directly to your amplifier and crank up carefully to hear if their sensitivity is about normal and if they don't make objectionable noises.

Last edited by Agent327; 10th April 2015 at 11:52 AM.
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Old 10th April 2015, 01:25 PM   #3
system7 is offline system7  United Kingdom
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New NP electrolytic capacitors as usually preferred in the bass section where fitted as original. They are also small.
Electrolytic Capacitors

Elsewhere 250V polypropylenes are an alternative.
MKP Polypropylene Capacitors
But check you have room to fit them for the larger values.
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Old 11th April 2015, 11:27 PM   #4
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system7 your a star,

any ideas why the mid is very faint? caps?

also I checked the site and the only one I cant see on there is the 4uf. how can I get that one?

which cap does the bass? is it which ever one is in parallel with the bass?

there's a 4uf, 12uf, and 25uf in there all 50v np presumably polypropylene.
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Old 11th April 2015, 11:57 PM   #5
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these are the tweeter I used:

https://www.madisoundspeakerstore.co...weeter-by-aac/

not knowing a great deal at the time about speakers I just bought what I thought would work as a replacement for the wharfdale originals.
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Old 12th April 2015, 02:30 AM   #6
system7 is offline system7  United Kingdom
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Really we have no idea yet why the mid is faint. Could be a dry joint, a faded 12uF capacitor or the mid itself.

Below is what I know about this nice little Wharfedale Linton XP3 speaker and crossover.

I would definitely use 12uF and 25uF non-polar wet electrolytics in the bass and mid section. You need their small DC resistance (less than 1 ohm) to keep filters well behaved here. A 3.9uF polypropylene should be OK in the tweeter filter.

Check and write down wiring polarity on the drive units before disassembling anything. I seemed to get ++- on my sim, and it all lined up quite nicely. 1kHz and 3kHz crossover, so the tweeter gets an easy ride.

I would have replaced the special Wharfedale cone tweeters with these:
Monacor :: Monacor HT-22/8 10W Cone Tweeter ONLY 6.00

Probably need a 5.6R + 5.6R (7W wirewounds) attenuator after the filter.
Attached Images
File Type: jpg Wharfedale Linton 3XP Speaker.JPG (33.8 KB, 149 views)
File Type: jpg Wharfedale_Linton_3XP_Crossover_1.JPG (91.7 KB, 146 views)
File Type: jpg Wharfedale_Linton_3XP_Crossover_2 Flipped.jpg (126.5 KB, 142 views)
File Type: png Wharfedale Linton 3XP Crossover.PNG (9.0 KB, 142 views)
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Old 12th April 2015, 04:39 PM   #7
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do I need the attenuators for my current setup with the audax tweeters?

where would these attenuators go?
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Old 12th April 2015, 05:43 PM   #8
system7 is offline system7  United Kingdom
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Ye Gods, attenuators are easy enough! They go before the driver and are designed to keep impedance around 8 ohms. You must always consider level when changing tweeters. Nothing worse than an overly bright tweeter.

Another way is to fit a calculated Zobel to correct impedance, and adjust a single resistor in front of the filter. Each ohm attenuates about 1dB. 5.8R and 0.03mH for the audax. I find this less fiddly overall, and corrects the rising response which the Audax has.

https://www.madisoundspeakerstore.co...weeter-by-aac/

Impedance Equalization (L-Pad) Circuit Designer / Calculator
Attached Images
File Type: png Attenuating Tweeter Output 2 ways.PNG (5.6 KB, 133 views)
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Old 13th April 2015, 08:59 AM   #9
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sorry total noob at this stuff. done electronics before but not speakers. I take it the diagram shows two possible ways of wiring it. so this will bring the audax back inline more with the other drivers?
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Old 13th April 2015, 09:01 AM   #10
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also the other circuit in your pervious post I take it is the crossover as is?
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