Hook up 2ohm sub bridged. Safe or not?

[Michael555]

I just got my JL w3v3 10" subwoofer today. I ordered at 4ohm sub so I could bridge it to my two channel KAC 7205 Kenwood 1000 watt amp but the online store sent me a 2ohm woofer by mistake. I talked to an expert at there store an he told me it would elbe safe to bridge this amp at 2ohm and it would give me 250 watts RMS which is perfect for this sub. Does anyone know if this is true because I want to make sure it's safe for the amp?

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[jasonAz 10+ year member]

If you plan on bridging the amp, NOPE. It will not work.

2-channel car amplifier

170 watts RMS x 2 at 4 ohms (250 watts x 2 at 2 ohms)

500 watts RMS x 1 bridged output at 4 ohms (4 ohm stable in bridged mode)

 

[Jerhemy 10+ year member]

just hook your sub up to one of the two channels at 2 ohm. you'll still get your 250 rms, just won't be bridged.

 

[daboyfrumdabx 10+ year member]

Issue with that game plan with one sub is he wouldn't get a mono signal. In order to get that, he'd then have to buy a y-adapter to send both left and right signals to whichever channel on the amp he uses. Personally, if I order one product and a company sends me another, I feel it is there responsibility to get me what I want. Contact whoever you purchased from and get the sub your ordered. Be sure that they cover shipping costs on this woofer back to them

 

[Michael555]

You guys positive it won't work cuz he keeps calling me and telling me this amp is stable bridged at 2ohms. I don't see how but he keeps telling me this. Any suggestions?

 

[Jerhemy 10+ year member]

Issue with that game plan with one sub is he wouldn't get a mono signal. In order to get that, he'd then have to buy a y-adapter to send both left and right signals to whichever channel on the amp he uses. Personally, if I order one product and a company sends me another, I feel it is there responsibility to get me what I want. Contact whoever you purchased from and get the sub your ordered. Be sure that they cover shipping costs on this woofer back to them

ahh makes sense, thanks for the clarification.

Yea, OP definitely get the product you ordered form the seller.

 

[trumpet 5,000+ posts]

This is a simple setup of an SVC subwoofer on a bridged 2-channel amplifier. Follow the instructions for how to bridge the amplifier and it's good to go at 2 Ohms, 250 Watts RMS. There's no need to worry about a mono or stereo signal to the amplifier, because it won't matter. Listen to the expert because you've been told the correct advice from the beginning.

 

[Michael555]

What gain (bass boost on amp) do you recommend and frequency to?

 

[daboyfrumdabx 10+ year member]

Bass boost should remain off. Set the filter to LPF and set it around 80hz (there's room for play in this area so move it up or down according to what sounds good to you, 80 is just a good starting point. For the gain, I suggest reading around here about how to set it. I believe there's a sticky about it. It's not just a random number we can give you, it is dependent upon your equipment.

 

[Michael555]

If my amp shuts off while playin does that mean it can't power the sub with enough wattage?

 

[daboyfrumdabx 10+ year member]

If all wire/connections (especially grounds as my experience with Kenwood amps is that they are really picky about grounds) are fine and the amp is getting the voltage it needs, it means that you either need to back off on the settings (gain, etc) or it could mean that the amp is having difficulty playing at 2 ohms bridged.

 

[keep_hope_alive Premium Member]

no, it means you got bad advice above. it shuts off when going into protect.

the amp is NOT stable at 2 ohms. both your seller and the posts above were incorrect. simply read the manual.

Kenwood - KAC-7205

EA-2006 Standard

170 W x 2 RMS Watts per channel @ 4 ohms, 1% THD+N80

80 dBA Signal to Noise Ratio (Reference: 1 Watt into 4 ohms)

Max Power Output 1000 W

Rated Power Output

14.4 V

170 W x 2 (4Ω) (20 Hz - 20 kHz, 0.08% THD)

250 W x 2 (2Ω) (1 kHz, 0.8% THD)

500 W x 1 Bridged (4Ω) (1 kHz, 0.8% THD)

to get 250W you do not bridge the amp. you run the sub off just one channel. that will give it 250W. you have the issue mentioned above of not giving the sub a mono signal (unless your HU can send a mono signal out a sub preout)

 

[jolly_26 10+ year member]

the amp is not stable at 2 ohms bridged! read the specs, send the sub back and get it sorted out! Kenwood - KAC-7205

EDIT: he beat me to it ^^^

 

[keep_hope_alive Premium Member]

This is a simple setup of an SVC subwoofer on a bridged 2-channel amplifier. Follow the instructions for how to bridge the amplifier and it's good to go at 2 Ohms, 250 Watts RMS. There's no need to worry about a mono or stereo signal to the amplifier, because it won't matter. Listen to the expert because you've been told the correct advice from the beginning.

please spend the 10 seconds looking up the amp to verify before posting incorrect information that can result in damaged gear.

 

[kr15 5,000+ posts]

This is a simple setup of an SVC subwoofer on a bridged 2-channel amplifier. Follow the instructions for how to bridge the amplifier and it's good to go at 2 Ohms, 250 Watts RMS. There's no need to worry about a mono or stereo signal to the amplifier, because it won't matter. Listen to the expert because you've been told the correct advice from the beginning.

ummmmm...are you seriously a 12v professional? A 2ohm bridged load on an amp that is 4ohm bridged stable? 2ohm= 250w rms? Thats a 2ohm STEREO load, not a 2ohm bridged load. Wow, just wow.

If my amp shuts off while playin does that mean it can't power the sub with enough wattage?

no, it means your amp is NOT 2ohm stable bridged