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Unread 2014-06-01, 11:24 PM   #1
Scooby24
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Default Small Amplifier for subwoofer?

My forester's radio has a built in amplifier to power the rear subwoofer. If I swap to an aftermarket it only has the 4 channel amplified output so I'd have to rely on another amplifier driven off the subwoofer output of the new radio.

I'd like to get something small enough that it could be mounted inside the rear plastic panels of the hatch of the forester.

The sub is a 6x9 so it wouldn't be needing much power at all..probably less than 100w...any recommendations?
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Unread 2014-06-02, 08:12 AM   #2
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You could get a 5 channel amp as well.
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Unread 2014-06-02, 08:20 AM   #3
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Quote:
Originally Posted by Billy Mild View Post
You could get a 5 channel amp as well.
Yeah but that's probably pushing way more power than I'd need to the rest of the speakers. The aftermarket radio that I'm considering is 4x65 which should be plenty for my old ears.
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Unread 2014-06-08, 03:25 PM   #4
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Help me out if I'm on the wrong track.

I have my headunit ordered, as I mentioned it's 4x65w so door speakers will all receive signal.

The OEM rear subwoofer is a 1.5 ohm 6x9 that is driven off an internal amplifier in the stock head unit...something like 18 watt RMS @ 2 ohm.

The stock head unit has a separate connector from the main harness just for the sub, and it's just a simple 18 gauge + and - wire.

The new head unit has rear L and R RCA out, so I'm thinking I could mount this Amplifier somewhere behind the radio in the dash, fish a small power lead to the battery, amp on wire from the head unit, and then connect the OEM wires for the sub to the output.

My question is, will I be pushing too much power to the stock speaker? I'm guessing so..but I don't know what RMS of this amp would be. Next, would the sound control from the head unit also control volume to the amplifier via the RCA?

http://www.walmart.com/ip/Sound-Stor...T-Amp/23852026




Reading the instructions, I think I have this right, but it's stating I should only be driving a 4ohm speaker, so I'd probably need to get a new 6x9.
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Unread 2014-06-18, 08:37 PM   #5
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You would be better off fitting a 6.5 inch sub in that spot. Get a small 2 channel amp that can be bridged.
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Unread 2014-06-18, 10:09 PM   #6
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Alpine make something for this.
http://www.sonicelectronix.com/item_...-KTP-445U.html

Also make sure that the amp is 2 or 1.5 ohm (or what ever the sub is stable).

U can get a amp that is more powerful than the sub and just not turn it up.

Another route is get something like an infinity bass link and just disconnect your stock sub. It will take line signal from your rear speakers and will sound better than your factory sub.

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Unread 2014-06-18, 10:16 PM   #7
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Just installed it all tonight, this little amp is a good mating to the Tang Band 6x9 subwoofer that fits in the stock space. At normal volumes it sounds like it did stock, but crank it up and it's more than I care to take...not a bad 32 dollar purchase.
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Unread 2014-06-19, 07:15 AM   #8
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good information !
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Unread 2014-06-19, 08:09 AM   #9
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What sub did the foz come stock with?
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Unread 2014-06-19, 08:23 AM   #10
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A 6x9 in the rear hatch's driver's 1/4 area.

The Tang Band 6x9 is quite a bit bigger so it took some modification to get it to fit, but it's a muuuuch better sub. It would be quite powerful if I were driving more wattage to it.
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