For anyone interested, I answered my own question in the above post and decided on the TD15H and 18″ passive radiator.
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Thank you for the informative reply. I should give more details for the planned build to better discuss the possibilities.
My car is a VW GTI hatchback that is going to have a false floor amp rack installed in the cargo area. There will also be a 10″ subwoofer mounted in a sealed enclosure within the center of the rack. It will be receiving 350W RMS which should blend with the front speakers very well for a SQ system.
I’m opting for the under floor placement so I can have full use of the back when I take trips or need to move things. However, most of the time the cargo area is empty so I’d like the option to have more bass with a box. I’m not a decibel junkie at all but do like to play stereos loud and the front stage is designed to handle a lot of power so will be able to match bigger subs.
One limitation I have is the amp powering the sub(s) is 120Wx4 which bridges into 350Wx2. The base system will be using it as a three channel to power rear midbasses and the 10″ sub. The reason I asked about two TD12H’s is I could significantly increase the low end wattage and displacement by disconnecting the rears to send 350W to each subwoofer.
However, lately I’ve been thinking a single 15″ would be a better choice to reduce cost, save space and avoid the hassle of swaping as many speaker cables. One of the main reasons I’m interested in AE speakers is their high efficiency so perhaps the one sub would produce enough with my limited watts.
How well do you think a TD15H would perform with an 18″ passive radiator and 350W?
Most of the car specific subs I’m looking at are $250-$500 each so the TD12H’s price isn’t an issue. I would use a IB12AU but have a hatchback so infinite baffle is out of the question.
The TD12H has a Fs of 26Hz so I could low pass around 85Hz to get closer to 60Hz of bandwidth. Though maybe it would be better to use the TD15H for its Fs of 21Hz.
I know the box will be need to be quite big to tune that low but since it won’t be in my car all the time I don’t mind completely filling the cargo area.
Anyone else have thoughts on how practical this would be?