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Onslaught
New Member

Help me plz

ok so i just have some lame shit im putting in my car ..

(1000watt Sony amp 400rms 800 peak watt JL sub in a bandpass box )

the sub cuts out at mid to high volume and my amp runs hella hot

so i looked a few things up checked all my wires and everything is good

so i tryed a diff sub and amp (Alpine 400watt amp n sub)

same thing happens it cuts out at like 25-35 n max is 45

if u have any ideas lemme know plz

batt n alt are new within the last year

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09-21-2011 12:07 PM

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N2Audio
Senior Member

It would help to know precisely what sub you have, and how you're connecting it to the amp. Also the amp models.

Sounds to me like you may have an impedance mis-match -- the impedance seen by the amps is below its intended minimum.

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09-21-2011 02:15 PM

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Onslaught
New Member

Subwoofer :

JL Audio 12W6v2-D4

12" W6v2 Series 4 Ohm DVC Subwoofer

RMS Power handling: 400 watts

Dual 4 Ohms 2.75" diameter, 4-layer voice coils

Kapton voice coil former

Customizable trim ring: can be painted to match installation colors

W-Cone: unibody design, extremely stiff and light

Floating-Cone attach method: ensures proper surround geometry for better excursion and voice coil alignment

Plateau-reinforced spider attachment: relieves stress from the spider at high excursions

Pole and cone venting: removes hot air during high power operation to improve sound quality and reliability

Forced-air-cooled aluminim alloy frame: enhances power handling and sound quality

Highly optimized motor systems: reduce distortion, and improve transient behavior

Large, progressive-roll spiders: optimized to controls long excursion without limiting it

Engineered lead wires and connectors: unique configuration block on one side of the basket, extruded lead wire casing ensures reliability and controlled behavior at extreme excursion

Power Handling: 400W/800W (RMS/Peak) per sub

Nominal Impedance: Dual 4 Ohms

Sensitivity: 85.9dB

Top Mounting Depth: 7.6"

Recommended Sealed Box: 0.90 - 1.50 cubic feet

Recommended Ported Box: 1.25 - 1.75 cubic feet

VRC" Technology

W-Cone" Technology

Elevated Frame Technology

Floating Cone Attach Technology

NeckVent" Technology

AMP: Sony Xplod 2-Channel 1000 Watt Amplifier

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09-21-2011 03:08 PM

Onslaught
New Member

i also tryed the alpine amp with the jl (my friend wanted his sub back so nomore alpine to try) and it also cuts out

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09-21-2011 03:09 PM

Onslaught
New Member

double post srry

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09-21-2011 03:09 PM

N2Audio
Senior Member

So I'm guessing you're trying to bridge the amp with the sub's coils wired parallel? That's a 2 ohm mono load on 4 ohm mono stable amps. They're doing what they're supposed to do.

You need to wire the sub's coils parallel for 8 ohms.

Instead of what you're trying to do, which must be this (pictures shows a mono amp instead of a bridged 2 ch):

That amp should still produce a decent amount of power. Sony's amps don't gain much by reducing the impedance of the driven load, likewise they don't lose much by increasing it.
I think it's a 340 vs 400w difference. Audibly about impossible to tell the difference.

Of course the biggest improvement - it won't shut down.