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I currently have (2) 10W7 in a ported box in the trunk of my 2002 Grand Prix. I have one JL Audio 1000 watt mono amp supplying power to the two 10W?s. It?s very sweet but I miss the low rumble you can only get with 12?s. I would have had them put in to begin with but the box would have taken almost all the trunk space so I went with the 10?s. To solve my problem a technician suggested I go with 1 sealed box with 1 10W7 and a JL Audio 500 watt amp to power it and a (1) 12W7 ported box with a 1000 watt JL amp to power it. Not only would this not take up any more additional trunk space the sound will be incredible. I listen to smooth Jazz and really miss the low rumble I use to get with 12's but I have never even heard of a mixing a sealed and ported box combined like this with two different size drivers and two different size amps. Right now my box with the (2) 10W7?s are ported and it?s my understanding that this is the factory recommended type of box for these drivers. The technician says he guarantees I'll be happy but this is new territory for me. I really don?t care too much about the trunk space anymore so I?m leaning towards playing it safe and simply going with (2) 12W7?s in a ported box with (2) JL Audio 1000/1 V2 Mono amps. One for each driver. That being said this other option has me very curious. Of the two which do you think would deliver me more bass with good low rumbles but with quality sound. Muddy base is not an option. Any have you ever either built or listen to a mixed system as I described above. To me it sounds like I?m going to be hearing a tight bass over shadowed by a ported box with twice the amps. I have had some technicians recommend different equipment but I?m already sold on JL so I would tell you that in advance. Regards, Larry

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  • tplayer Jul 02, 2009

    This covered everything I was concerend about.
    Thank you!

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Thanks for choosing FixYa Larry.

I am an independent Car Audio Shop and have been working in car audio since 1993.

It is very common for different sized speakers to be used in a SQ (Sound Quality) setup like you want.

What the tech is suggesting is fine - as long as the crossovers are set properly.

What you're aiming for is to use the 10" for MIDBASS. This is the frequency that is between Midrange and Bass - so it is aptly named.

When you have Only Door speakers for Highs and midrange... and 12" for sub bass frequencies - there is an entire range you are missing.

Midrange should be crossed over to play no lower than 120Hz (door speakers)
MidBass should be crossed over to play from 120Hz to 80 Hz (10" subwoofer - used as midbass)
SubBass should be crossed over to play 80Hz to 35Hz

The 10" being in a sealed enclosure will give you tight & accurate midbass (guitar, bass, drums etc.. ) and give you a good kick. The tradeoff with a sealed enclosure is low power handling. The 10W7 handles the 500W all day long!!

The 12W7 will handle 500-1000W all day, and will provide the power and air displacement for the booming bass below 80Hz (Bass, Drum, etc) so it seems your amplifiers are well matched.

I would suggest having the car RTA tuned after the install is complete to be sure your gains are properly set. You dont want one range overpowering another.

Go with the single 10 & 12 sub setup... you may even be able to modify your current enclosure if they are seperate chambers.

Using (2) 12w7s will not give you the SQ setup you are looking for - and you will be missing the midbass range that is so prevalent in Jazz music. It will be overpowering and inaccurate.

If you have additional questions or concerns - please use the "Continue With This Expert" option so we are connected directly in the future.

Thanks for using FixYa!!

Posted on Jun 29, 2009

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