Jack Gilvey
Senior HTF Member
- Joined
- Mar 13, 1999
- Messages
- 4,948
I've started this thread to continue the discussion begun inthis thread,since it needed one of its own.
Basically, Dan Wiggins (Adire Audio) posed this question:
Basically, Dan Wiggins (Adire Audio) posed this question:
Hi all,
A few thoughts...
1. I think a different thread dedicated to driver design/dreaming would be in order.
2. Hoffman's Iron Law still rules: small and deep means low efficiency. So if you want a small sub, then you WILL NEED a big amp. We're talking at least $400+ for the amp alone. Keep that in mind in the discussion.
3. PRs are great, if you can afford them (cost and space). A fully-tricked-out XBL2 motor'd Tempest would require a pair of VERY high excursion 18" PRs. This will run in the $150+ range for each PR. So you're looking at $300 plus the driver (figure $250+ for a monster excursion 15" driver), and $400+ for the amp. Or an entry cost around $1,000, not including the cabinet.
But from a size issue, you need to be able to physically mount the PRs and the driver. Which means your box is at least 20" high and 20" deep, and at least 18" wide. That's not too small to start with.
4. If EQ is the goal, why even use PRs/vents? What if you had a 15" driver with a clean 35mm of one-way Xmax? In an EQ'd sealed box, you could do some serious damage with it, at a lower cost - no PRs or vents needed, just a big amp (which we might be resigned to).
5. Motor strength? It has to be strong enough to move the cone in the size of box you want, and no more. You can have too much motor strength for effective use as a subwoofer. Means you MUST equalize to get the response back, but in that case why drop all the bucks into a super strong motor only to equalize it away?
Anyway, just some thoughts. But it seems like the summary goal would be:
- 3 cubic foot box
- high power handling
- capable of 5+L of linear displacement (twin Tempest range)
- suitable for sealed or vented boxes
Thanks,
Dan Wiggins
Adire Audio