Twin Eminence Delta 15LF in subwoofer

[bob123]

Hi

I have a couple of Eminence Delta 15LF's taken from a pair of bass horns. I plan to make a subwoofer that can provide a good amount of bass down to around 35-40 Hz. What kind of enclosure would be preferable for this? When put into winISD the size of the box required is generally pretty large.

Perhaps electronic equalisation is required to get a decent response down to this level (it is unlikely that they will need to be used at full power 2 x 500w RMS)

Cheers

[chris661]

A sealed box with a lot of eq would work. Apart from that, PA drivers generally seem to need big boxes.

[Xoc1]

The Delta 15LF only has an xmax of 4.8mm it will not take anything like its power rating at the low frequencies you want.
The Eminence site shows a single driver in a 165 litre cabinet limited to 175W with a steep hi-pass set at 35Hz
http://www.eminence-speaker.com/pdf/cab-delta-15lfa.pdf.
Xmech is quite large, I would think that a manifold type reflex cabinet would be good. The 2 opposing drivers help to reduce distortion when xmax is exceeded.
manifold subwoofer or labhorn?

[chris661]

Iso-braric loading could be an option, to reduce the cabinet size...

[Rademakers]

How large can the cabinet be?

Best regards Johan

[tb46]

Hi,

Using the isobaric arrangement will reduce the necessary volume, but, it will also reduce the available SPL. I have (mis-) used speakers before in a sonotube isobaric bandpass with some success.

Regards,