I'm thinking of putting a Volt RV4504 into a sealed box enclosure of about 110 litres net volume and using parametric equalization of 8dB at 40 Hz with a Q = 2. Does anyone have any comments or suggestions? Edited by: JS
I only have limited space, hence the small volume, ideal volume for a critically damped sealed box is about 220 litres, but I don't have the room. Using the eq is the only way to get a decent response. Would a cabinet of this size act as an acoustic suspension rather than an infinite baffle?
Infinite Baffle is a term used for a box where the baffle folds round and meets itself around the back. Acoustic suspension is a term used where a speaker will have specs that allow it to operate in a sealed box. I.e. a box with no tuning port. It is then impossible to tune these in a ported box. A lesson I learned whilst experimenting with Dynaudio speakers. So, are you talking about a small reflex cab that can be tuned to gain the optimum performance with your setup?
I was thinking of a sealed box of 110 litres with parametric eq. Could you use parametric eq with a reflex enclosure of a similar size to extend the low frequency response? Volt quote -3dB of 45 Hz in a 100 litre enclosure, could you eq this to -3dB at 35 Hz?
am i right in thinking this is a hifi application rather than pa? if so, your approach might work, and the reduction in max spl should not be a problem. Ithink bag end in the us uses such approaches in the design of their hifi subs.
for pa applications, i would suggest another approach such as reflex to avoid problems reaching xmax very rappidly which will happen with a sealed, eq'd system.
I used to have a pair of REL subs... sounded great, until they died when my roof leaked. Were they sealed? I never looked around them. Good sounding boxes. The ASS Hi-Fi cabs also use Volts (I'm not sure which models)...
However, a reflex would be smaller unless you need the fast transients that sealed boxes provide. If you have so little space anyway, a 15" might be a better choice. I'm not a fan of using EQ to sort out a system, EQ should be used to optimise sound on an already good sounding speaker. Don't mind my thoughts.
\'bits of ply round a driver\'
you wont find a better 18" woofer for your task. light cone, low fs and a xmax to die for. but why bother with an 18" in 110ltrs? i wouldnt spend te £450 on a driver unless i was gonna be making the most of it. and a 200ltr+cab is the order of the day really.in a 300ltr cabinet you will get an f3 of 34hz.at 600wrms you are gonna have xmax capabilities down to 30hz. the best thing is theMms of this driver - 1/3 lighter than the average 18" driver. Im gonna be ordering some volt 18" as soon as i pluck up the courage to spend £900!