Chinese/Taiwan 4 Dual Cone Speakers - diyAudio
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Old 11th August 2010, 08:56 AM   #1
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Default Chinese/Taiwan 4 Dual Cone Speakers

Moderator note: Two threads have been merged into one. The second starts at post 66.

Hi, this is my first post and hope someone can help me.

I’ve recently bought a pair of Chinese/Taiwan 4” dual cone speakers (with neodymium magnets) with nothing else to go on than “they looked nice” and one person’s opinion that they compare favourably with his own Lowthers but apparently “without the Lowther shout”.

I have very little mathematical knowledge/experience of acoustics or speaker design but have a certain amount of mechanical intuition and a decently equipped workshop. I have built valve amplifiers and speakers with and without plans so I have some experience in building stuff but wanted a more scientific ground up approach to this build. Gut trembling bass extension isn’t a priority but good low mids to sparkling treble together with realism & placement with a flat response are.

I had considered a Voight pipe for ease of build and efficiency but the comb filtering effect is a big concern. I had thought of adding a rear facing speaker wired out of phase and maybe of a different size and at a different height to the main speaker to iron out this comb effect. I also thought of wiring this other speaker on an L pad to adjust it’s effect. But this is all based on intuition and a product of my fevered imagination with only the lightest grasp on whether it would work or not.

I have attached a photo of the apparent specs and the speakers themselves. There is a name blurred out on the specs, as they are supposedly debadged speakers from a well-known manufacturer.

Hope someone can point me in the right direction.
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Old 11th August 2010, 11:09 AM   #2
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Nah, it's likely overstock that someone bought up from a production run at the Guide Sound OEM factory.

You don't want to be wiring two drivers sharing a volume out of phase, whatever the box type you settle on; you'll end up with no output at all. As one moves out, the other moves in & therefore there is no air displacement. I'll see if I can figure something when I get a minute.

Last edited by Scottmoose; 11th August 2010 at 11:17 AM.
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Old 11th August 2010, 12:17 PM   #3
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Thanks for your reply, I see the point on speaker phasing - should have noticed that really

Thanks for your offer of help.

Stuart.
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Old 11th August 2010, 01:51 PM   #4
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Tang Band? Sure looks like their graphs. Similar cones and phase plug to their larger units.
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Old 11th August 2010, 02:19 PM   #5
ttan98 is online now ttan98  Australia
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I bought a pair of these recently and I have mounted each in a sealed cabinet, about 5litre. Initial impression is very good. They are beautifully made just like the image on Ebay.

I will post the FR and an image of my cabinet once I get the sound to settle down and made some measurements. They are worth the money go and buy them. BTW I am not associated with the company in anyway. Cheers
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Old 11th August 2010, 02:58 PM   #6
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they are cute, aren't they? is there a link to ebay?

phase plug and specs are from guide-sound, which is the unit maker for audionirvana and others, Scott is right (is it a surprise??).

seem like a good candidate for mid-highs OB, still the little 3" on the AN site withouth the wizzher looks more intriguing to me.
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Old 11th August 2010, 03:59 PM   #7
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It's been known (but not often).

Anyway, yeah, Guide-Sound units, not TBs. Pretty little things (as drive units go), though if I'm honest, I think the engineering's dodgy / pandering to fashion. A 4in driver should not require a whizzer, and I'm not much of a fan of neodymium motors either, other than for tweeters.

Assuming the factory data is accurate, you could try this small MLTL. 30in long, CSA 27.5625in^2. Driver centre 3in down from top. Vent close to bottom as possible on the front baffle, 2in diameter x 2.5in long. Line top, back & one side-wall 10in down & adjust to taste. Excursion's a bit high, but short of doubling up or going to something more complicated, which I don't have time to design, there isn't much that can be done about that.
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Old 11th August 2010, 07:40 PM   #8
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Thanks ttan98 good to hear the opinion of someone who's actually handled and heard a pair of these speakers. Do you have any detail on dimensions and how you damped the cabinets?
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Old 11th August 2010, 08:08 PM   #9
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Scott, thanks for your comments & thoughts, very helpful. I can't picture what the following means though - "Line top, back & one side-wall 10in down & adjust to taste"

Hope you can clarify for me.

Many thanks, Stuart.
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Old 11th August 2010, 08:59 PM   #10
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It means line the internal top, back and one side-wall with damping material down for 10in from the top and adjust the quantity to taste.
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