Seas custom 6-1/2″ 4Ω Woofers, based on L18RNX/P but with black anodized dustcap+cone and a low frequency optimized motor,
BNIB, $49 USD each, many available.
Specs and design examples can be found here:
Seas Custom L18RNX/P Based Woofer Specs
BNIB, $49 USD each, many available.
Specs and design examples can be found here:
Seas Custom L18RNX/P Based Woofer Specs
An externally hosted image should be here but it was not working when we last tested it.
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Optimized for low frequency use in a 2 way bookshelf or four drivers (series/parallel connection) in a floor standing/tower speakers.
Suggested Enclosures
Sealed
Suggested cabinet volumes are between 7 and 15L. The latter yields a Butterworth alignment with a bass system resonance of 50Hz and a frequency response that is -3dB at 50Hz.
Ported
Suggested cabinet volumes are between 10 and 25L. The latter yields a Butterworth alignment when tuned to 29Hz with a 2" ID x 10" port. The frequency response of this alignment is -3dB at 30Hz.
Measurements and Example Crossover
This custom Seas woofer was installed in a sealed enclosure and a passive crossover was designed for an acoustic 2nd order LR low pass transfer function with a crossover frequency of 2KHz. This is a great transducer for a 2 or 3 way bookshelf or tower speaker crossed over to a midrange from 100 to 750Hz or a tweeter at 2 to 3KHz.
Frequency response graph with and without passive crossover (schematic below). Calibrated mic at 1M, 2.83V.
Schematic Diagram of a 2nd order LR low pass transfer function with a crossover frequency of 2KHz.
Suggested Enclosures
Sealed
Suggested cabinet volumes are between 7 and 15L. The latter yields a Butterworth alignment with a bass system resonance of 50Hz and a frequency response that is -3dB at 50Hz.
Ported
Suggested cabinet volumes are between 10 and 25L. The latter yields a Butterworth alignment when tuned to 29Hz with a 2" ID x 10" port. The frequency response of this alignment is -3dB at 30Hz.
An externally hosted image should be here but it was not working when we last tested it.
Measurements and Example Crossover
This custom Seas woofer was installed in a sealed enclosure and a passive crossover was designed for an acoustic 2nd order LR low pass transfer function with a crossover frequency of 2KHz. This is a great transducer for a 2 or 3 way bookshelf or tower speaker crossed over to a midrange from 100 to 750Hz or a tweeter at 2 to 3KHz.
Frequency response graph with and without passive crossover (schematic below). Calibrated mic at 1M, 2.83V.
An externally hosted image should be here but it was not working when we last tested it.
Schematic Diagram of a 2nd order LR low pass transfer function with a crossover frequency of 2KHz.
An externally hosted image should be here but it was not working when we last tested it.
Thanks for posting the positive feedback...great to hear they work well in your application!
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Thanks for your inquiry. Overseas shipping has unfortunately proven to be cost prohibitive at >$100USD /pair + the cost of the woofers!
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