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Driver Replacement for Yamaha Subwoofer
Driver Replacement for Yamaha Subwoofer
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Old 7th December 2018, 06:50 PM   #11
Brian Steele is online now Brian Steele  Grenada
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Originally Posted by Gwho View Post
Thank you for all the thoughts on the subwoofer. I will definitely try plugging the ports and see how they sound. Perhaps I will get more low frequency output using for of them.

Regards,
gwho
If this subwoofer uses some sort of feedback loop to modify its output, plugging the ports is likely not going to produce good results.

I must do some more reading about this YST tech. Looks interesting...
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Old 13th December 2018, 05:11 AM   #12
basreflex is offline basreflex  Spain
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most likely the loop adds electronic mass to the driver to create a a lower Fs.
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Old 19th December 2018, 09:09 AM   #13
KaffiMann is offline KaffiMann  Norway
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Driver Replacement for Yamaha Subwoofer
... And then the question is: Can it be DIY'd easily?
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Old 19th December 2018, 09:43 AM   #14
basreflex is offline basreflex  Spain
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this yamaha uses the technique described by erik stahl , also discussed in this forum:
Simple MFB woofer project
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Old 19th December 2018, 09:55 AM   #15
smichael is offline smichael
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Karl Erik Stahl developed a technique where the amplifier is synthesizing some of the parameters of the driver used, most impotantly the moving mass AND the resistance of the voice-coil. With a negative output-impedance of the amplifier the eletrical Q of the driver is reduced, and the synthezised mass-increase is lowering the Fs without decreasing the efficiency.
The bottom line is that even with a new driver the amp will dominate the driver-parameters, which means that a new driver probably not will improve the performance, even if the circuit is calibrated to fit the new driver the best possible way.

Steen
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Old 24th December 2018, 05:37 PM   #16
Gwho is offline Gwho  United States
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Thank you all for the discussion, information, and thoughts. Merry Christmas and Happy Holidays to all. As I previously mentioned, I will use the Yamaha's as is or sell them. They do not sound bad at all when using four of them in a small room but they do not have the low frequency impact of larger subwoofers that I have heard.

Regards,
gwho
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Old 23rd January 2019, 09:18 PM   #17
brad1138 is offline brad1138  United States
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Originally Posted by ParadiseComm View Post
If the mounting opening matches, I'd look at a GRS 10SW-4 driver. Anything more than that, you can be spending more on a replacement driver than the subwoofer is worth.
My Brother in Law just blew the driver in his 315. Should that be a good replacement driver? Should it sound, "more or less" as good as the original?

Thanks.
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Old 23rd January 2019, 09:52 PM   #18
Moondog55 is offline Moondog55  Australia
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Just from a quick read on the manual is it possible that you have simply trialed them with the cut-off set too low?
Setting the cut-off at 40hz the graphs indicate very reduced output
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Old 23rd January 2019, 10:20 PM   #19
brad1138 is offline brad1138  United States
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Originally Posted by Moondog55 View Post
Just from a quick read on the manual is it possible that you have simply trialed them with the cut-off set too low?
Setting the cut-off at 40hz the graphs indicate very reduced output
He listens loud, and he says it started rattling loudly.
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Old 24th January 2019, 01:55 AM   #20
Moondog55 is offline Moondog55  Australia
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Quote:
Originally Posted by brad1138 View Post
He listens loud, and he says it started rattling loudly.
Where does he say that? I can't find that statement so I figure I must be missing something but "Rattling would indicate to me a poor join somewhere or loose screws perhaps
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