Pro Drivers for Home Speakers? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 13 Old 03-21-2020, 08:32 PM - Thread Starter
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Pro Drivers for Home Speakers?

I happened to purchase a pair of Celestion T5745A SP-1200 12” drivers from PE on a buyout that I had planned to use for something else and have changed my mind. I was wondering how these would work to build a pair of subwoofers or possibly putting them in a pair of diy tower speakers. Does the fact they are “Pro” drivers make a difference compared to home audio? I have also included a snapshot of the specs.

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post #2 of 13 Old 03-22-2020, 07:08 AM
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They will work ok in a 40-50hz tuned ported cab.
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post #3 of 13 Old 03-24-2020, 06:15 PM
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Yeah, might be useful for that, more an MBM than a sub unless the OP is planning on usiing it in a car, but without knowing the Xmax, it's difficult to determine whether it's worth it. Most Celestion stuff has a modest Xmax.

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post #4 of 13 Old 03-25-2020, 05:28 AM
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Quote:
Originally Posted by A9X-308 View Post
Yeah, might be useful for that, more an MBM than a sub unless the OP is planning on usiing it in a car, but without knowing the Xmax, it's difficult to determine whether it's worth it. Most Celestion stuff has a modest Xmax.
According to the Q&A on the Parts Express page for the driver, the Xmax is 2.5mm.

edit - Here is the full Q&A on that driver:
What is the Xmax of this Celestion T5745A SP-1200 speaker?

: You can contact Celestion for technical support. Drdecibel at their domain (I'm not allowed to post it here)
Here's what he sent me.
"Xmax 2.5 mm
Coil winding ht 13 mm
Gap ht 8mm"
---------------
This is a very conservative rating based only on the amount of voice coil overhang. Speakers from other manufacturers with similar topology will be rated higher because they use a different formula, like overhang + a percentage of the gap ht, or by audio measurement up to an arbitrary amount of distortion (usually 10%).
A comparable speaker from another manufacturer would likely be rated between 3.3 - 5 mm depending on their method.
I modeled it, and here is what it looks like with the recommended enclosure size, with a 45Hz 2nd order HPF, and 100 watts, which keeps it within the 5mm xmax.


Last edited by mustang guy; 03-25-2020 at 06:06 AM.
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post #5 of 13 Old 03-25-2020, 06:00 AM
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Suitable for Fronts, center and Rears, it would struggle when implemented as a sub
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post #6 of 13 Old 03-25-2020, 08:13 AM
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DIYSG designs use a lot of pro woofers, you could do a modified version of one of those speakers.
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post #7 of 13 Old 03-25-2020, 12:20 PM - Thread Starter
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I was actually hoping it could be used as part of a 3-way design. Thanks for the information.
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post #8 of 13 Old 03-25-2020, 02:30 PM
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Quote:
Originally Posted by brireeves629 View Post
I was actually hoping it could be used as part of a 3-way design.
It would be OK as the midbass in a 3 way, if you also ran subs.


As a general response to your header question, yes, there are many pro audio drivers that work very well in domestic designs and builds. I've been using little else for 20 years; JBL. PHL, BMS, B&C, Faital Pro, RCF, EV, Eminence, 18Sound, Emilar and Beyma for example, but it depends on the specific driver.

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Last edited by A9X-308; 03-25-2020 at 02:34 PM.
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post #9 of 13 Old 03-25-2020, 07:04 PM
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Quote:
Originally Posted by A9X-308 View Post
It would be OK as the midbass in a 3 way, if you also ran subs.


As a general response to your header question, yes, there are many pro audio drivers that work very well in domestic designs and builds. I've been using little else for 20 years; JBL. PHL, BMS, B&C, Faital Pro, RCF, EV, Eminence, 18Sound, Emilar and Beyma for example, but it depends on the specific driver.
Here in the US, we also have Acoustic Elegance. Fantastic products.
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post #10 of 13 Old 03-25-2020, 09:46 PM
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Quote:
Originally Posted by mustang guy View Post
What is the Xmax of this Celestion T5745A SP-1200 speaker?

: You can contact Celestion for technical support. Drdecibel at their domain (I'm not allowed to post it here)
Here's what he sent me.
"Xmax 2.5 mm
Coil winding ht 13 mm
Gap ht 8mm"
---------------
This is a very conservative rating based only on the amount of voice coil overhang.
But it still doesn't really tell you all that much. At what excursion will the distortion become objectionable for example? Motor and suspension linearity determines that. I was just looking for an idea of what SPL it might be capable of to get an estimate of whether it was a potentially useful driver.
Quote:
Originally Posted by Mike Garrett View Post
Here in the US, we also have Acoustic Elegance. Fantastic products.
I know. I bought my first 8, 4 TD10M and 4 TD15X not long after John took over from Nick in 2008. Got another 4 TD15S locally secondhand a few years later. I agree, they're excellent. Until recently the 15S were used 2/side in my mains and the 15X as midbass in 4 surrounds. The 10M are reserved for another project next year.



However, I don't really consider them 'pro' drivers in the usual sense, as whilst the non M driver have good Xmax, the Xmech is lower than I'd want in a pro driver.

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post #11 of 13 Old 03-26-2020, 11:02 AM
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Quote:
Originally Posted by A9X-308 View Post
But it still doesn't really tell you all that much. At what excursion will the distortion become objectionable for example? Motor and suspension linearity determines that. I was just looking for an idea of what SPL it might be capable of to get an estimate of whether it was a potentially useful driver.
I know. I bought my first 8, 4 TD10M and 4 TD15X not long after John took over from Nick in 2008. Got another 4 TD15S locally secondhand a few years later. I agree, they're excellent. Until recently the 15S were used 2/side in my mains and the 15X as midbass in 4 surrounds. The 10M are reserved for another project next year.



However, I don't really consider them 'pro' drivers in the usual sense, as whilst the non M driver have good Xmax, the Xmech is lower than I'd want in a pro driver.
TD18H+
Xmax: 14 mm(peak)
Xmech: 25 mm(peak)

Looks pretty good to me.
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post #12 of 13 Old 03-26-2020, 04:12 PM
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Quote:
Originally Posted by Mike Garrett View Post
TD18H+
Xmax: 14 mm(peak)
Xmech: 25 mm(peak)
Still a low Xmech/Xmax ratio compared to many pro drivers.



Recones are also not easily available and I'm not convinced of the rated power handling as John doesn't state which methodology he uses, eg, AES1994.

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post #13 of 13 Old 03-31-2020, 04:39 AM
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