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Old 20th February 2006, 05:56 AM   #1
senderj is offline senderj  Hong Kong
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Default Newbie question: driver replacement

I've just cooked my 18 year-old Tannoy Oxford's bass. It's a 10" (or 8" ?? the hole is 9" in the enclosure) driver. The enclosure has a paper port. Can I simply buy a bass driver of same size to replace it? Do I have to consider the port size and length? Anything I have to pay attention to in such replacement? Any recommendation on the driver? Any where I can read about such replacement myself?
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Old 20th February 2006, 06:27 AM   #2
simon5 is offline simon5  Canada
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Since the hole is 9" wide, it's probably a 10" unit.

Yes you should take into account box internal net size, port length and port diameter.

If you can get the T/S parameters of your old bass driver, you could replace it with a bass driver with similar parameters. If you can't, with the box size, port length and port diameter, we can suggest you something to replace it.

If you can't find a similar driver, I suggest you to buy a pair of newer drivers, even if you only destroyed one.
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Old 20th February 2006, 09:26 AM   #3
sreten is offline sreten  United Kingdom
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Hi,

The Tannoy Oxford's use a 10" dual concentric driver with crossover.

You can't fit a substitute, you need original replacement parts.

/sreten.
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Old 20th February 2006, 09:50 AM   #4
dnsey is offline dnsey  United Kingdom
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Contact Lockwood Audio about reconing your drivers (or for the parts to DIY). Well worth doing, and much cheaper than relacing your speakers with anything of similar quality.

Apart from the fact that the drivers are of a unique design, the TS parameters of the bass units would be difficult to match even if you considered using seperate tweeters.
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Old 21st February 2006, 01:15 PM   #5
senderj is offline senderj  Hong Kong
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Thank you all for your helps.

I do not have the TS parameters. The internal box size is 30X53X21 cm. The port diameter is 6.5cm and length 12 cm. Any recommended replacements are most welcomed.

From the manual, the crossover is at 4kHz. Is this a bit high in today's standard?
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Old 21st February 2006, 03:02 PM   #6
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by senderj

Any recommended replacements are most welcomed.
Quote:
Originally posted by sreten

You can't fit a substitute, you need original replacement parts.
or

Quote:
Originally posted by dnsey
Contact Lockwood Audio about reconing your drivers (or for the parts to DIY).
or completely replace with something like :

http://www.adireaudio.com/Home/KITHE10-1.htm

model your box and the Beta 10CX in WinISD.

/sreten.
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Old 22nd February 2006, 02:22 AM   #7
simon5 is offline simon5  Canada
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So it's a 33.39 liters box tuned to 42.12 Hz.

You'd need a 10 inches driver that would do well in that enclosure.

Since the crossover is so high, you need a good 10 inches driver. Maybe John from Acoustic Elegance could manufacture something worth it like a Lambda TDX or something.

To complement the bass driver at the 4 kHz crossover, I'd use a Seas 27TBFC/G or 27TDFC.

You could also upgrade the crossovers to better parts at the same time, like air core coils and polypropylene capacitors. You could also lower the crossover to have more choice in the 10 inches market.

Does someone knows a 10 inches driver that would do well in 33 liters (1.2 cu.ft) tuned to 42 Hz ?
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Old 23rd February 2006, 02:26 PM   #8
senderj is offline senderj  Hong Kong
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Thanks for the calculation. I did some search but looks like it is difficult to find a replacement. First of all, there is no more 10" mid-bass. All 10" driver nowadays are woofer up to 1kHz only (some even up to 600Hz only). Secondly, the crossover of my Tannoy is 4kHz. But most drivers available in the market are designed for 2-2.2kHz crossover.

If I replace the crossover, it may not match with the remaining tweeters, which I don't know the parameters. Seems I have to replace the whole speaker instead. If anybody know about any 10" mid-bass that covers up to 4kHz please let me know. Thanks in advance.
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Old 23rd February 2006, 02:43 PM   #9
AndrewT is online now AndrewT  Scotland
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Hi,
I don't have Tannoy Oxford data to hand but your crossover is not @ 4kHz.

I think it is more likely to be between 1200Hz and 2kHz.

However, the crossover frequency is completely irrelevant. If you change the bass/mid driver, you throw away the treble unit as well.

Your dual concentric Oxfords, even damaged, are worth more than replacement drive units for a new speaker assembly.

Make a decision, either keep and repair the TANNOYS or sell them and buy/assemble new speakers.
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Old 24th February 2006, 05:36 AM   #10
senderj is offline senderj  Hong Kong
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Thanks for your further help.

The 4kHz crossover was read from the instruction sheet came with the speaker. I haven't examine the crossover cricuit, so not able to confirm this.

Looks like the two options are the ways to go. Thanks.
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