Came across these beautiful woofers (www.ciare.com, www.seeburg.net). They have Neodynium magnets, low mechanical losses and usually very benign frequency response in spite of their paper cones + the prices are ok for what they offer.
The 12.00 NdW 12 inch woofer was tested in Hobby Hifi 04/2002 and had exceptionally low distortion figures.
I would like to use one of these woofers in a sealed box subwoofer and use a LT circuit to extend bass response to about 25 Hz.
Unfortunately, their fs is pretty high and Qts pretty low. Hence, configurations with a Q of 0.5 to 0.6 (for good impulse response) have an f3 of >100 Hz. Given the rather low linear excursion, they cannot handle the 16x increase in excursion at the LF end that a LT circuit brings.
What can I do:
- increase Q_es through series resistance: screws up damping factor
- increase m_ms by gluing/sandwiching something onto the cone, preferably increasing stiffness while not allowing resonances. Should lower fs and increase Q. Experience?
Eric
PS: the attachment needs to be renamed to .xls
The 12.00 NdW 12 inch woofer was tested in Hobby Hifi 04/2002 and had exceptionally low distortion figures.
I would like to use one of these woofers in a sealed box subwoofer and use a LT circuit to extend bass response to about 25 Hz.
Unfortunately, their fs is pretty high and Qts pretty low. Hence, configurations with a Q of 0.5 to 0.6 (for good impulse response) have an f3 of >100 Hz. Given the rather low linear excursion, they cannot handle the 16x increase in excursion at the LF end that a LT circuit brings.
What can I do:
- increase Q_es through series resistance: screws up damping factor
- increase m_ms by gluing/sandwiching something onto the cone, preferably increasing stiffness while not allowing resonances. Should lower fs and increase Q. Experience?
Eric
PS: the attachment needs to be renamed to .xls