Hello everyone!
Despite being new here, I've immersed myself in the world of audio for quite some time. Currently, I'm engaged in crafting a custom 8-inch woofer and find myself in a cycle of tweaking components to find that sweet spot. I'll be sharing a DATS v3 file and the WINISD recommended box volume. My objective is to achieve a flat response reaching down to at least 40 Hz, all within a box size of 25-30 liters. Could you kindly guide the specific parameters to adjust in the woofer driver design to meet this goal? Your assistance would be greatly appreciated!
Despite being new here, I've immersed myself in the world of audio for quite some time. Currently, I'm engaged in crafting a custom 8-inch woofer and find myself in a cycle of tweaking components to find that sweet spot. I'll be sharing a DATS v3 file and the WINISD recommended box volume. My objective is to achieve a flat response reaching down to at least 40 Hz, all within a box size of 25-30 liters. Could you kindly guide the specific parameters to adjust in the woofer driver design to meet this goal? Your assistance would be greatly appreciated!
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Add more mass to the cone for lower Fs, lower sensitivity, and higher Mms.
You may need more Bl from the motor to compensate.
Make sure the Xmax is long enough to allow for the extension you want. This may be how you add mass.
You may need more Bl from the motor to compensate.
Make sure the Xmax is long enough to allow for the extension you want. This may be how you add mass.
Sealed Box woofer
Fs 28.3 Hz
Qts 0.5
Qes 0.56
Qms 4.667
Vas 28 Liters
Re 5.6 Ohms
Dia 16.5 cm
Sd 0.02138 m^2
Cms 0.000436 m/N
Mdt 0.0725 kg
Bl 11.36 T*m
no 0.11%
SPL 84.02 dB/2.83V
SPL 82.47 dB/1W
Rms 2.764
Vented Box woofer:
Fs 40
Qts 0.405
Qes 0.50
Qms 2.132
Vas 28
Re 5.6
Dia 16.5
Sd 0.02138 m^2
Cms 0.000436 m/N
Mdt 0.0363 kg
Bl 10.11 T*m
no 0.34%
SPL 89.02 dB/2.83V
SPL 87.47 dB/1W
Rms 4.280913216
Model these in software, you will find you get 40Hz F3 in maximally flat alignments,
Typically 8 ohm rated drivers have a DC coil resistance of ~6 ohms.
Fs 28.3 Hz
Qts 0.5
Qes 0.56
Qms 4.667
Vas 28 Liters
Re 5.6 Ohms
Dia 16.5 cm
Sd 0.02138 m^2
Cms 0.000436 m/N
Mdt 0.0725 kg
Bl 11.36 T*m
no 0.11%
SPL 84.02 dB/2.83V
SPL 82.47 dB/1W
Rms 2.764
Vented Box woofer:
Fs 40
Qts 0.405
Qes 0.50
Qms 2.132
Vas 28
Re 5.6
Dia 16.5
Sd 0.02138 m^2
Cms 0.000436 m/N
Mdt 0.0363 kg
Bl 10.11 T*m
no 0.34%
SPL 89.02 dB/2.83V
SPL 87.47 dB/1W
Rms 4.280913216
Model these in software, you will find you get 40Hz F3 in maximally flat alignments,
Typically 8 ohm rated drivers have a DC coil resistance of ~6 ohms.
Last edited:
In your first post the third illustration shows the "recommended" tuning...you can indeed alter the box volume AND its box tuning frequency. By making the box volume larger along with the lowering of the tuning frequency, your F3 value will begin to drop, reaching lower & lower frequencies. By experimentally doing this incrementally a little at a time, you will notice the graphed response starting to "sag" at around sixty hertz. By limiting the sagging response to about ONE decibel, you can still get some low end improvements.
---------------------------------------------------------------------------------------------------------------------------------Rick...
---------------------------------------------------------------------------------------------------------------------------------Rick...