Hi all, I was given two of these yesterday because both voice coils are rubbing and my buddy was throwing them out. I can replace the voice coils with no problem but I'm just wondering if anyone can tell me what they are. They have a square ferrite magnet and a super cool cast basket. Thanks
These would appear to be woofers from Wharfedale Dovedale speakers.
Below is the 3014 woofer from the final iteration of the Dovedale - the Dovedale 3.
The Dovedale 3 woofers were engineered in the days before T/S parameters.
However, I can give you the following information:
The dc resistance is 6 ohm.
Flux density is 135,000 maxwell.
Free air resonance is 25Hz
Crossover frequency 600 - 1,500Hz.
More useful perhaps is the fact that they were designed to operate in a 45 litre sealed enclosure, when the response will be 3dB down at 45Hz.
EDITED.
Below is the 3014 woofer from the final iteration of the Dovedale - the Dovedale 3.
The Dovedale 3 woofers were engineered in the days before T/S parameters.
However, I can give you the following information:
The dc resistance is 6 ohm.
Flux density is 135,000 maxwell.
Free air resonance is 25Hz
Crossover frequency 600 - 1,500Hz.
More useful perhaps is the fact that they were designed to operate in a 45 litre sealed enclosure, when the response will be 3dB down at 45Hz.
EDITED.
Last edited:
Thanks for the Info. Yes, a quick Google of Wharfedale Dovedale gives me a lot of info. Appreciate the help.
Same woofer as mine - different model of Wharfedale loudspeaker.
The woofer was used in the W60D, the Dovedale III and the later Dovedale 3 - pretty much identical loudspeakers, just getting newer in cosmetic design.
I like the baskets on these. Great vintage design. I'm going to keep my eyes open for some decent-sized field coil motors to stick on them.
I was able to unbolt the magnet on one of them. The voice coil is basically welded into the gap. The coil former is burned up and flakes when handled.
I understand why most people would toss these in the bin but I see so much potential. It's interesting that the voice coil has that aluminum donut placed right where the cone attaches. That may be common but I've never seen it before.
I understand why most people would toss these in the bin but I see so much potential. It's interesting that the voice coil has that aluminum donut placed right where the cone attaches. That may be common but I've never seen it before.
These drivers are using a small magnet gap to get a high BL. Unfortunately it doesn’t leave room for the coil to expand or deform a little bit from heat. Yeah, it’s toasted, but not the burnt black you usually see. With modern drivers you can swim laps in the magnet gap, and they make it up with a stronger magnet (at least when they care about motor strength).
The donut will act as a fixed shorted turn, it has the effect of linearizing the BL over excursion and extending HF response. You don’t see that on cheaper drivers. If you can get what you need to recone them they would be nice, but I have doubts about getting the parts. Maybe clean them up as much as possible and put them in a sealed Rubbermaid bin and keep on the lookout for suitable reconing materials.
The donut will act as a fixed shorted turn, it has the effect of linearizing the BL over excursion and extending HF response. You don’t see that on cheaper drivers. If you can get what you need to recone them they would be nice, but I have doubts about getting the parts. Maybe clean them up as much as possible and put them in a sealed Rubbermaid bin and keep on the lookout for suitable reconing materials.
The aluminum ring (see the large attachment) is said to prevent the use of shims to centre the voice coil once the surrounds are removed.
Note also that the task of replacing the "Flexiprene" roll surround would be complicated by virtue of the 3014's non-standard dimensions.
P.S. I've located my full listing of the Wharfedale 3014 specifications - just for the record!
Heavy duty paper cone
Flexiprene roll surround
High stability rear suspension
Outer chassis diameter 315mm
Inner cone + surround diameter 305mm
Mounting hole circle diameter 320mm
Nominal impedance 6Ω
Large ceramic magnet, flux density 135,000 maxwell
System power handling 50W DIN
Driver free air resonance 25Hz
Response only 3dB down at 45Hz in a 45 litre sealed cabinet
Upper crossover frequency 600 - 1,500Hz
