Help - RS265HF Bass Bin for MTM

[bill_s]

Any enclosure volume suggestions, sealed or vented, for the RS265HF to be used with a Scanspeak MTM? If vented, what size port? I want to use two bins, each using a single RS265HF. I already have the subs. Usage is 100% music only - ranging from rock, blues, jazz, classical to opera. Thanks in advance!

[curt_c]

The sealed has an f3 of 40 Hz in 30 liters and a Qtc near .707. This driver doesn't really like vented alignments. -They can be done, but the port length is a killer.

The best vented alignment I could come up with was 60 liters tuned to 20 Hz. This required a 4" x 36" port, which is just doable, or a 3" x 19", which actually may be acceptable if you use flares and aim it out the back or at the floor. -The f3 is a very impressive 21 Hz, and may be the more worthwhile alignment.

For the best of both worlds: If you plug the vented enclosure, you get a sealed Qtc of just below .6.

C

[bill_s]

> The sealed has an f3 of 40 Hz in 30 liters
> and a Qtc near .707. This driver doesn't
> really like vented alignments. -They can be
> done, but the port length is a killer.

> The best vented alignment I could come up
> with was 60 liters tuned to 20 Hz. This
> required a 4" x 36" port, which is
> just doable, or a 3" x 19", which
> actually may be acceptable if you use flares
> and aim it out the back or at the floor.
> -The f3 is a very impressive 21 Hz, and may
> be the more worthwhile alignment.

> For the best of both worlds: If you plug the
> vented enclosure, you get a sealed Qtc of
> just below .6.

> C

Thanks Curt! That is where I ended up also. For my purposes, sealed seem the way to go. I wasn't sure if I was making a mistake with the port dimensions. Thanks for the sanity check! Sealed it is.
- Bill

[Pete Schumacher ®]

> Thanks Curt! That is where I ended up also.
> For my purposes, sealed seem the way to go.
> I wasn't sure if I was making a mistake with
> the port dimensions. Thanks for the sanity
> check! Sealed it is.
> - Bill

And forgo the obnoxiously long port.