How long can the jumper wire be for subwoofers wired in series?

[KiloWatt]

I took my subs out of my car and am using them on my home theater amp (had an additional channel for subwoofer). I wired them in series, and now I want to spread them out quite a bit (20-30 feet). But I am wondering if this could possibly hurt my subwoofers with a jumper wire so long. It could be harmless, but I needed to be sure (example: I have heard that if a grounding wire on an amp is too long, it will cause damage). Any info on this would be outstanding.

Also, if anyone has a guide to subwoofer placement in home theaters, that would also be cool. I am using the Dolby guidelines for the loudspeakers, but they don't go in depth enough with subwoofer. I know subwoofer placement makes huge differences, like in a car, with the subs facing to the front or back makes wonders of differences.

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[93 saturn sl2 10+ year member]

the sub should be placed near the front in a corner of the room on next to the TV to the right or left. sorry i cant help with the jumper cable

 

[80_Cutlass_mn 10+ year member]

I honestly dont think you will have to worry about it. The only thing you have to really worry about is the resistance in the wire being so great that it reduces the output of your subs. Otherwise I dont see anything harmful coming from it.

 

[KiloWatt]

I am really stuck now... I called a local audio shop (I go to them for ALL car audio equipment & questions), and they said no problem really. Then I called a couple other stores, and 3 of them said with such a long jumper wire, the amp would have to work extremely hard to push the power, making my amp a short life. I finally called Alpine (subs are made by them), and they said there wouldn't be any problem with a long jumper wire.

HELP!!!!!!!!!!

 

[ANeonRider 10+ year member]

Then I called a couple other stores, and 3 of them said with such a long jumper wire, the amp would have to work extremely hard to push the power, making my amp a short life.

Do me a favour, never talk to the people that work there again. The bullshit coming from there is rediculous. You will not have a problem at all with having a long wire run to the other sub.