GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Audio Discussions
In the Thread: Romy The Cat's new Listening Room

Post Subject: Real estate & the Fs of 18-inchersPosted by jessie.dazzle on: 5/5/2010

Romy wrote:

"...I use 10” but they have free air resonance of 19Hz. Not any of 18” drivers have such a low resonance..."

Well if we can believe the manufacturer's spec sheet, it is possible to get close; McCauley claims a free air resonance of 20Hz for their 6174. At 94dB, they are not as sensitive as we might like, but when driving them with SS amps, this is not a big issue.

"...The enclosure I have in mind would be 40-50 [cubic] feet at least and two of them is HUGE space..."

OK, that is well beyond anything I'd want to take for a walk. You might be able to get away with a bit less; if I remember correctly, my calculations at the time (based on the above driver) yielded a theoretical ideal volume of something like 23 cubic feet (sealed), so still not something one would casually push around.

This discussion comes at a good time for me, as I'm now trying to move (its complicated). My current thinking is that the best possible room would be in a house having volumes (closed rooms/spaces) adjacent to the main room (basement, bedrooms, upper level or attic) which would house the mid-bass horns, while serving as an enclosure for lower-bass (nearly IB). In this case, the volume of the main room would be determined only by the following:

1) Adequate distance between the L and R horns, while not crowding the side walls.
2) Adequate distance from the horns to the listening point, while not crowding the wall behind the horns, or the wall behind the listening point.
3) Adequate space for the lowest LF wave.

The idea being to avoid the 10 bedroom mini-mansion typically associated with really big main rooms, which might prove difficult to load.

jd*

Rerurn to Romy the Cat's Site