Modifying Diamond 9.6 crossovers - Page 3 - diyAudio
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Multi-Way Conventional loudspeakers with crossovers

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Old 10th July 2012, 06:40 AM   #21
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o, sorry. once again Click the image to open in full size. it is default cross (3,5 way).
Better cross (4 way, it better, because in default 12uH coil, that doing bass slow and drone) :
twiter Click the image to open in full size.
mid Click the image to open in full size.
mid bass Click the image to open in full size.
bass Click the image to open in full size.
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Old 10th July 2012, 06:45 AM   #22
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so, i think change the default tweeter on Vifa OX20SC00-04... It will be end of upgrade.
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Old 10th July 2012, 12:50 PM   #23
system7 is offline system7  United Kingdom
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I'm not sure where you are going on that Astaro.

Looking at it another time, I see the reflex subwoofer rolls off quite fast around 150Hz due to the simple huge coil. So it's basically just adding some bass and bafflestep to what is really a 3 way closed box design.

A kevlar woofer, and fabric dome midrange and tweeter crossing over at 1kHz and 6kHz is a very nice combination with potentially very good phase alignment and imaging and lack of woofer cone breakup. I'd simply disconnect the sub woofer and put it against a wall and have a listen.

I'd assume Wharfedale have done a good job on the crossover and consider just some better polypropylene capacitors. Upgrading coils is a bit trickier, since you want to match overall resistance too. Care is needed because phase alignment is one of this design's strengths.
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Old 11th July 2012, 10:40 AM   #24
sreten is offline sreten  United Kingdom
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Hi,

If it isn't bust don't fix it, probably applies here. The tweeter has a
film capacitor. You could change the two mid capacitors to film.

rgds, sreten.
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Old 16th January 2013, 03:43 AM   #25
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another noob question but i was messing about inside the center channel, is this the correct position for the negative and positive ? with the green cable on top ?

imgur: the simple image sharer
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Old 16th January 2013, 07:49 AM   #26
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Yes - green above. I will check mine again soon as I have to put padding back in that I left out a few weeks ago... they are currently in storage while our house is painted.
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Old 16th January 2013, 07:51 AM   #27
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Quote:
Originally Posted by derwhalfisch View Post
Yes - green above. I will check mine again soon as I have to put padding back in that I left out a few weeks ago... they are currently in storage while our house is painted.
thanks for the prompt response, greatly appreciated
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Old 25th February 2013, 01:03 AM   #28
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I have just upgraded the capacitors to Clarity Cap SA.
I measured the old electrolytics and they all tested higher than marked.
4.7uF was 5.3uF averaged accross both caps
6.8uF was 7.2uF averaged
22uF was 24uF averaged
Would .6uf and .4uF make a large enough difference to the crossover points to be a problem?
At the moment the speakers sound better than before the upgrade.
Am I being to exact and worrying about nothing.
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Old 25th February 2013, 02:05 AM   #29
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Quote:
Originally Posted by ekidnah09 View Post
I have just upgraded the capacitors to Clarity Cap SA.
I measured the old electrolytics and they all tested higher than marked.
4.7uF was 5.3uF averaged accross both caps
6.8uF was 7.2uF averaged
22uF was 24uF averaged
Would .6uf and .4uF make a large enough difference to the crossover points to be a problem?
At the moment the speakers sound better than before the upgrade.
Am I being to exact and worrying about nothing.
Hi there e: All manufactured products have a toleance. I'd expect to see a plus-minus situation from mesuring a batch of parts. All of the readings being high is suspecious of the measuring device calibration. On several occasions on this site, someone posted a measured perameter for a specific product at variance with the manufacturers published data and then someone else posted a diferent value, leadng to the question of which of the three is correct. I do not have calibrated equipment, traceable to the national standards office, so I have to use my judgement when selecting values for simulations. ...regards, Michael
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Old 25th February 2013, 02:44 AM   #30
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I should add that the old 3uF polyprop tested 3.01uF averaged across both caps and all the replacement caps tested on average 3.02uF, 4.89uF, 6,88uF and 22.8uf so much closer to the marked values. So even if my meter was unclaibrated there is a difference between the electrolytics and polyprop caps.

I also found a fault with one speaker cabinate. The internal sealed box had not been glued properly and the hole for the wires was also unsealed so the mid was in a not very well sealed box.
Fixing this would of helped the sound also.
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