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-   -   Keystone Sub Using 18, 15, & 12 Inch Speakers (https://www.diyaudio.com/forums/subwoofers/185588-keystone-sub-using-18-15-12-inch-speakers.html)

weltersys 5th October 2019 02:47 PM

Quote:

Originally Posted by wreckingball (https://www.diyaudio.com/forums/subwoofers/185588-keystone-sub-using-18-15-12-inch-speakers-post5934664.html#post5934664)
1) Reducing cabinet width may actually be an improvement for a 15", but you will need to experiment with the exit size. As a starting guess, I'd reduce the exit dimensions by the same % as the cabinet width and height are reduced.
And bolded ..is this still your starting guess? I'm still considering experimenting, so clarification would be great.
2) Speaking of which, can someone point me to a thread or link that spells out what I need to determine how much voltage/wattage I'm feeding to a driver in a high-power/PA type scenario, and for testing them in general for that matter.. (?)

1) Reducing the width should not have much effect on Fb, but reducing height would shorten the path length, which would. The Eminence 15" I used when originally making the comment did not work well with the stock Keystone, while the Dayton 15 later used in the taller version had quite similar frequency response to the BC18TBW100.
2) You can get a good idea of the peak watt output simply using the meters on your amplifier, the NU6000 hits 3000 watts into 4 ohms when the "0/limit" lights, the -6 dB light would be around 750 watts, -12dB 187 watts, -24 12 watts.
Depending on the crest factor of the material being played, the average power could be equal for a sine wave type signal (3 dB crest factor) or as little as 5% for music with a wide dynamic range.

Art

mwmkravchenko 5th October 2019 03:01 PM

Quote:

Originally Posted by weltersys (https://www.diyaudio.com/forums/subwoofers/185588-keystone-sub-using-18-15-12-inch-speakers-post5934226.html#post5934226)

Seems most of the people building the Keystone run them at levels that would "break in" the driver in a few hours, but glad to hear yours are housebroken!

Cheers,
Art


Probably the reason why they are called woofers in the first place :D


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