Frank Mowry
Stunt Coordinator
- Joined
- Mar 25, 2003
- Messages
- 57
I'm looking at making my first sonosub and had a question regarding the effects of second sub (exactly the same) added to the mix. Is there a formula that computes the added SPL achieved while adding another identical sub? I played around with WinISD and notice if a select 1 vs 2 drivers in a vented box tuned to 25 Hz it appears that I get about a 3 dB increase vs the single across the board.
My dilemma is wanting to use "what I have sitting in the parts bin". I've got the tools, connectors, MDF, etc. Just need to pick up a plate amp and the sonotube.
I've currently got 2 Phoenix Gold XMAX 10s. I know using a car sub won't provide the best performance but despite them being pretty nice subs for small car encosures it doesn't seem that anybody even considers tens for their cars anymore. I can't even sell both for the price of a Shiva. Haven't put them up on ebay yet but similar sales seem to indicate they go for 50-60 bucks a piece. That's why I figure I'll at least start the project to see how it works. These subs are in the WinISD database. I'm getting the standard PE 250w amp to drive on.
In WinISD I played with these numbers which seem doable:
Number of drivers : 1
Box type : Vented
Box size : 85.9 l
Tuning frequency : 25.00 Hz
Vent : 1 vent(s)
14.74 in length for each
4.02 in round
Tube would be only about 23 inches tall at 18 inch diameter. Call it Stubby. SPL would be a rather anemic 88 db max at 30 hz dropping to 86 across the board. Is this a total waste of time? Adding the second driver with the same parameters yields the 3 dB increase across the board. It also yields the cost of another amp which could be put towards a better driver. The second driver in the same tube isn't practical for me from a design standpoint but replicating the first sub would be. Does 2 drivers in 1 enclosure yield the same increase as 2 drivers in separate enclosures (given the same total volume)?
Feel free to tell me if this is a waste of time (aside from gaining experience).
Thanks,
Frank
My dilemma is wanting to use "what I have sitting in the parts bin". I've got the tools, connectors, MDF, etc. Just need to pick up a plate amp and the sonotube.
I've currently got 2 Phoenix Gold XMAX 10s. I know using a car sub won't provide the best performance but despite them being pretty nice subs for small car encosures it doesn't seem that anybody even considers tens for their cars anymore. I can't even sell both for the price of a Shiva. Haven't put them up on ebay yet but similar sales seem to indicate they go for 50-60 bucks a piece. That's why I figure I'll at least start the project to see how it works. These subs are in the WinISD database. I'm getting the standard PE 250w amp to drive on.
In WinISD I played with these numbers which seem doable:
Number of drivers : 1
Box type : Vented
Box size : 85.9 l
Tuning frequency : 25.00 Hz
Vent : 1 vent(s)
14.74 in length for each
4.02 in round
Tube would be only about 23 inches tall at 18 inch diameter. Call it Stubby. SPL would be a rather anemic 88 db max at 30 hz dropping to 86 across the board. Is this a total waste of time? Adding the second driver with the same parameters yields the 3 dB increase across the board. It also yields the cost of another amp which could be put towards a better driver. The second driver in the same tube isn't practical for me from a design standpoint but replicating the first sub would be. Does 2 drivers in 1 enclosure yield the same increase as 2 drivers in separate enclosures (given the same total volume)?
Feel free to tell me if this is a waste of time (aside from gaining experience).
Thanks,
Frank