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post #1 of 16 (permalink) Old 07-13-2014, 07:51 AM Thread Starter
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Sub without add-on amp?

How crazy would it be to run a subwoofer from the head unit without an amp?
I have a Pioneer AVIC-X950BH. Pioneer says a single sub can be driven from two rear channels at up to 70 watts @ 2 ohms.
I'm sure the sound won't be spectacular, but would it be worthwhile to do this? I'm really just looking for a little better sound quality when the volume is higher due to ambient muffler/road noise.
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post #2 of 16 (permalink) Old 07-13-2014, 08:58 AM
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Why not pick up a cast off Radio ten sub woofer that fits under the driver's seat. You can really feel it in the seat of your pants, literally.
I find mine to be totally adequate, and it has it's own built in amp albeit a small one, and it plugs right into the existing harness under the driver's seat.
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post #3 of 16 (permalink) Old 07-13-2014, 09:28 AM
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John, are you using the stock speakers or have you already upgraded them?
A Sub driven directly of the radio would probably not do what you want, in fact it may sound worse.
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post #4 of 16 (permalink) Old 07-13-2014, 09:47 AM Thread Starter
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The under-seat factory sub is an option, but since I'm not using the factory radio, I'm not sure how optimal that will be.
I have the Polk DB6501 component set, which I may install today. I was going to see how it sounds after the speaker upgrade, then go forward with the sub if I'm not happy. Perhaps an aftermarket powered sub?
I have the Polk DB651 coaxials in the other car, and I'm ok with them, but not blown away. Honestly, I asked Barney if he upgraded the speakers in the Applecrate because I thought they sounded as good as my other car. He didn't. It was just standard Radio 9 factory setup. I put the Pioneer in last summer, but hadn't done the speakers yet.
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post #5 of 16 (permalink) Old 07-13-2014, 11:25 AM
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I upgraded my radio and speakers from the infamous smart premium system and I'm using the factory sub with polks. You can do this but there is a pair of wires that feed the sub that have to move. Originally smart did something like the "front" left channel and the "right" rear channel to feed the sub . I have mine set so that the polks are "front" on my pioneer radio and the "rear" on the pioneer are the factory tweeters and sub. I can balance them via the fader on the radio. I know it doesn't make much sense but there is somewhere on the site explaining this . I think "smart Digger" was the one that detailed it.
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post #6 of 16 (permalink) Old 07-13-2014, 11:14 PM
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I think I remember reading about the pin outs for the radio wiring and specifically for the Radio 10 sub on Evilution.
Where are you going to place the tweeters?
The main thing I dislike about my radio 10 is the complete lack of a rear sound stage. I've been tempted to put in Polks, but I really would want to add those rear speakers. I'm not very motivated since I'm too busy listening to the sounds of the smart as I use the paddle shifters. I never leave it in auto mode for long. I always want a little more performance. I still wish my Brabus had come with its missing Euro turbo package.
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post #7 of 16 (permalink) Old 07-14-2014, 05:08 AM Thread Starter
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I spent a good part of yesterday cleaning up my original head unit installation. Lots of long wire lengths that needed to be re-routed and secured. GPS antenna, bluetooth mic, and SiriusXM antrenna cables are long enough to reach the back of a normal car and I have everything in the dash area.
After agonizing and investigating, I put the tweeters in the a/c vents. They look good, I'll post a pic later, but I still have to install the driver's door speaker and wire the crossovers. Maybe tonight for the speaker. Wiring may wait for the weekend.
Sorry about the missing turbo!
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post #8 of 16 (permalink) Old 07-14-2014, 07:47 AM
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Isn't fun tidying enough wire that would work for 2 smarts?
I'm starting a project on my son's smart. The entryline radio HAS to go!! He'll get a full blown navigator radio similar to my setup...
(I hope my back holds up so I can climb under the dash to "tidy" up the wiring when the time comes.)
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post #9 of 16 (permalink) Old 07-15-2014, 07:02 PM Thread Starter
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Pics, as promised.
Finished the job tonight and I'm pretty happy with the sound. May not need the sub after all.

Sorry about the photo orientation.
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post #10 of 16 (permalink) Old 07-16-2014, 08:40 AM
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That's a very slick install (or installation for the purists....) The tweeters go well with the old style vents - not sure they would work so well with the 2011 and later vents. Kudos!
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