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Old 21st September 2014, 09:28 PM   #1
gornir is offline gornir  Sweden
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Default Wharfedale Diamond 10.2 review and DIY mods

Hi,

I've done a four part review and some DIY mod suggestions on the Wharfedale Diamond 10.2 loudspeaker for those who are interested!

Wharfedale Diamond 10.2 review part 1
Wharfedale Diamond 10.2 review part 2
Wharfedale Diamond 10.2 review part 3
Wharfedale Diamond 10.2 review part 4

Regards

/Göran
Attached Images
File Type: jpg WD10.2_1.JPG (88.7 KB, 145 views)
File Type: jpg WD10.2_3.JPG (75.7 KB, 140 views)
File Type: jpg WD10.2_8.JPG (114.1 KB, 142 views)
File Type: jpg WD10.2_11.JPG (105.5 KB, 141 views)
File Type: jpg WD10.2_19.JPG (96.6 KB, 141 views)
File Type: jpg WD10.2_35.jpg (102.2 KB, 79 views)
File Type: jpg WD10.2_40.jpg (106.9 KB, 69 views)
File Type: jpg WD10.2_47.jpg (90.6 KB, 50 views)
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Old 21st September 2014, 11:11 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

FWIW your picture of the bassmid clearly shows the sealing gasket.

rgds, sreten.
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Old 21st September 2014, 11:19 PM   #3
system7 is offline system7  United Kingdom
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Good stuff, Gornir.

That's what I call a proper evaluation. What a terrible sample you ran into. Without having your expertise, I don't think the average user would have picked up the faults.

I suppose it removes the mystique to show the filter, but that is always the most interesting thing for me. That second order original crossover is quite shallow, isn't it? Near LR2 I'd think. The Bowers and Wilkins B&W 685 looks similar, but only uses a single capacitor IIRC. B&W Group North America Service & Support - Service Manuals

I like your upgrades idea. That is very DIY and the sort of thing that people like to do here. You might find this post interesting on ZD5-type ladder networks: Could a kind soul please break down this horrid Xover

To my surprise, I found a regular 4th order treble works much the same way as a 3rd order plus ladder delay network if you flip the polarity.

4 ohm bass seems to be a bit simpler than 8 ohm to implement. I've noticed that trend a lot in commercial speakers. But woven Kevlar is something we don't usually consider in DIY for some reason. The bass Le was low too. Maybe a shorting ring in there. The Qts of 0.6 on a reflex was another surprise.

I shall reread the whole thing again later in the week.
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Old 22nd September 2014, 12:51 AM   #4
ttan98 is offline ttan98  Australia
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Gomir,

A very good thorough review, this what I called an Engineering Review.

The first thing that comes my mine is the quality control from Wharfedale leaves a lot to be desired.
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Old 22nd September 2014, 03:55 PM   #5
gornir is offline gornir  Sweden
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Quote:
Originally Posted by sreten View Post
Hi,

FWIW your picture of the bassmid clearly shows the sealing gasket.

rgds, sreten.
Hi Sreten,

Yes, that's the sealing gasket I put on. Originally it was non existing!

Regards

/Göran
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Old 22nd September 2014, 04:05 PM   #6
gornir is offline gornir  Sweden
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Quote:
Originally Posted by ttan98 View Post
Gomir,

A very good thorough review, this what I called an Engineering Review.

The first thing that comes my mine is the quality control from Wharfedale leaves a lot to be desired.
Thank you!

I think I had exceptional bad luck with my pair and I hate to think this should be a common quality control issue from Wharfedale. On the other hand e.g. the faulty wired cross-over was really bad and shouldn't slipped through the quality control.

I was also surprised to see that there was a thin layer of dust covering the speakers underneath the plastic wrap-in.

However my local Hifi shop gave me new replacement drivers for the faulty ones without hassle.

Regards

/Göran
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Old 23rd September 2014, 09:40 PM   #7
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Back in 2008 I had a pair of Diamond 9.6 which were modified due to poor sound. The walls were 16mm and were made of some particle board, that looked and felt more like cardboard but MDF. The drivers had cast aluminium baskets and quite good build quality, the finish however had issues too, box damping was taken care by a single roll of polyester fill behind the woofer.
The biggest issue with them turned out to lie in the crossover section - poorly executed crossover with a 5db dip in the 3-7Khz region, electrolytic caps and iron cored coils ( well, one was 13mH so that I could understand but the other was 1.3mH ).
Mod was close to this one - walls were treated with bitumen pads, sheep woolffrom Visaton replaced the small polyester rolls, crossovers went to ClarityCap PX and air cored coils, the mid-tweeter section was reworked to clear the, what looked like an intentionally designed, dip in the power response. They improved but not considerably and nowhere near a similarly priced DIY project. Together with those speakers I bought the then flagship Panasonic 50" TV available here and they sounded pretty much the same as the TV`s inbuilt speakers but with more bass.
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