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Post by maceo23 on Sept 5, 2010 12:39:00 GMT -7
Hey guys,
I have a pretty cool project that I am designing on a 46' Sea Ray. It has 2 independent audio systems for the cockpit area and the saloon/bedroom. Its going to be a 12 volt system, but I think I want to do in infinite baffle under the floor in the saloon using a couple of JL marine 10" subs. I know that they are not really optimal, but they are design for IB applications, and I think they will fit the bill. Any thoughts or advice would be appreciated.
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Post by moonfly on Sept 5, 2010 13:13:52 GMT -7
Are you talking about using the internal space inside the hull as the IB enclosure. I know nothing about boats, but can you even access that space normally. In theory, the idea is sound, but I would think that a couple 10" drivers (designed for car installs?) wouldnt be enough to do this effectively. You got one hting right though, this sure is an interesting idea  . I think if you could ost the make and model of the drivers tough, it will help with taking a look at this project. |
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Post by maceo23 on Sept 5, 2010 15:42:07 GMT -7
Access is definitely not a problem. I have a couple of large access panels that lift up out of the floor in the main saloon. I plan on using a pair of JL M10IB5-CG-WH subs.
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Post by ThomasW on Sept 5, 2010 22:40:03 GMT -7
Whether they fit the bill depends on which model you have, one is for IB use the the other isn't.
As for the rest of it who knows? This forum's only focus is home audio, not mobile audio (of any kind). As a result we have no info about the kind of install you describe.
I think accessing one of the larger car audio forums would be your best bet
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Post by moonfly on Sept 6, 2010 10:56:34 GMT -7
surely the principles involved in an IB still apply though. The area of space is likely to be closer to that of a home environment than a car one is it not?
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Post by chrisbee on Sept 6, 2010 12:45:25 GMT -7
It can only to be discussed here if he moors his boat permanently.  Then it's a house boat. ;D |
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Post by ThomasW on Sept 6, 2010 18:12:48 GMT -7
surely the principles involved in an IB still apply though. The area of space is likely to be closer to that of a home environment than a car one is it not? He has a single 10" driver with 13mm of Xmax for each space. How in the world would those compete with engine noise and the sound created by the water hitting the hull? IMO the concept of "subwoofer" and a motor driven vehicle is an oxymoron since it's difficult enough to do a decent "woofer" under those circumstances |
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Post by chrisbee on Sept 6, 2010 21:44:43 GMT -7
Open backed headphones would be a cheap mobile IB. But a (very) poor choice where noise levels are high.  This brings a whole new meaning to displacement. Boom-boom. ;D "Would it matter if I made the driver cut-outs under the waterline?"  You could have a row of 18" drivers along each side and pretend they were portholes.  If Somali pirates came too close you could give them a broadside of Metallica!  What if a whale objected to what you were shouting in deep bass?  The whole idea of a marine IB seems a bit fishy.  Are we having fun yet? |
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Post by moonfly on Sept 7, 2010 14:06:54 GMT -7
surely the principles involved in an IB still apply though. The area of space is likely to be closer to that of a home environment than a car one is it not? He has a single 10" driver with 13mm of Xmax for each space. How in the world would those compete with engine noise and the sound created by the water hitting the hull? IMO the concept of "subwoofer" and a motor driven vehicle is an oxymoron since it's difficult enough to do a decent "woofer" under those circumstances Well, I wouldnt think you would sail and listen to music at the same time, and if the OP wants to listen t bass on a boat, then wouldnt an IB style sub be as good as any? Sure the drivers arent what you would suggest, but besides that . . . . . . . Of course, if you wish to only talk about home installs, then fair enough. |
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Post by ThomasW on Sept 7, 2010 16:46:52 GMT -7
I gave up playing with car audio some 30yrs ago (it became boring). So I have nothing to offer when it comes to mobile IB sub designs.
As a result I think the big car audio forums are the best resource for people wanting info about IB design for mobile audio.
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Post by chrisbee on Sept 7, 2010 23:18:31 GMT -7
Dan
An IB is dependent on the environment in which it exists. A home audio IB is assumed to exist in a room of sufficient proportions to provide nominally flat response. Room gain increases with decreasing volume until cabin gain becomes overwhelming in its effects.
The average home audio enthusiast wants to be able to build something which will provide a reliable performance envelope. It should provide adequate headroom, suitable extension and not need excessive power just to overcome pumping losses. The existing IB "package" is well proven.
I have no idea whether anybody has written software to help design car audio IBs. I'm not sure WinISD has a box for entering cabin volume. Even if it had, I consider the anti-social aspects of forcing any hobby on innocent members of the public highly undesirable.
How many people have been injured or even died as a result of innocent drivers suddenly being exposed to excruciatingly loud bass? Our fight or flight mechanism is still attuned to avoiding loud noises.
You aren't legally allowed to have a noisy exhaust. Yet you can greatly exceed normal levels with a subwoofer! Like the moron who drove past our place at 3.30am the other morning leaving a trail of people wide awake. Don't people have a right to peace at any time of their lives? How did all these woken people's lives function the next day? How did the world change for those who were in contact with them? The butterfly effect is not just a myth.
Driving is a highly developed skill requiring great concentration to do well. Or should be. If Thomas chooses not to aid those bent on behaving antisocially then it is his choice. I would personally ban the playing of any music while a vehicle is in motion. Music alters the mood, the concentration, the heart rate and the body chemistry of the listener. Who can say whether any such changes are beneficial to the act of driving carefully? Would you allow a TV screen so that the driver can watch films while they are driving?
Let's be careful out there and enjoy our music and films in a safe situation. Where we can concentrate on the enjoyment without disturbing others.
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Post by moonfly on Sept 10, 2010 4:54:39 GMT -7
*shakes head*
ok, fair enough. I will say no more.
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