Problem with wiring a sub to an amp.

[jimbo_limited]

What i have new is my Visonik V318XT mono amplifier. The sub i want to wire is the Rockford Fosgate P312D4.

Amp Specs:
mono subwoofer car amplifier

1000 watt peak output

800 x 1 RMS @ 2 Ohms

400 x 1 RMS @ 4 ohms

MOSFET power supply and output stage

preamp input and output

fuse rating: 25A x 2

12-13/16"W x 2-1/2"H x 10-5/16"D

50Hz - 250Hz Low Pass Filter

Variable Bass Boost 0-18dB

Subsonic Filter 20 - 50Hz

Fuse Rating: 25A x 2

Variable Bass Boost 0 - 18dB @ 45 Hz
Power/Protection LED
RCA Line Inputs & Outputs
Thermal/Short/Overload Protection Circuitry
Adjustable Input Sensitivity
Full MOSFET Circuitry
Frequency Response: 20Hz - 20kHz
THD <0.05%

RF P312D4 Specs:

Size 12"
Impedance 4-Ohm x 2
Power Handling 500 RMS
1000 Peak
Sensitivity 87 dB
Motor Size 102 oz. double stacked
Voice Coil Diameter 2.5" aluminum
Speaker Connector Dual 8 AWG compression
Mounting Depth 6.375"
Rec. Sealed Enclosure 0.75 cu. ft.
21.24 liters
Rec. Vented Enclosure 1.75 cu. ft. (49.56 liters)
Tuning Frequency (vented) 37 Hz
Shipping Weight 25.2 Lbs.
(11.4 Kg.)




The amplifier specs states its Rated 500w RMS @ 4 Ohm Load, 1000w MAX @ 2 Ohm and 800w RMS @ 2 Ohm. My subwoofer is a 500w RMS DVC 4Ohm. Can i wire my sub to an 8 ohm and wire it to the amp? (Cant find any 8 ohm specs on this amp) Or can i wire it to 2 ohm safely? But since this amp supplies 800w rms on a 2 ohm load will this blow my subwoofer? What can i do to wire this sub safely to the amp.


Mike

[mfreak]

> The amplifier specs states its Rated 500w RMS @ 4 Ohm Load, 1000w MAX @
> 2 Ohm and 800w RMS @ 2 Ohm. My subwoofer is a 500w RMS DVC 4Ohm. Can i
> wire my sub to an 8 ohm and wire it to the amp? (Cant find any 8 ohm
> specs on this amp) Or can i wire it to 2 ohm safely? But since this
> amp supplies 800w rms on a 2 ohm load will this blow my subwoofer?
> What can i do to wire this sub safely to the amp.

Wire the sub's VC's in parallel, making a 2ohm load, and bridge your
amp. If you wire the sub in series, it'll be 8ohms, and your amp
will only push about 250rms into it. You're better off going larger
than smaller, music isn't gonna be constantly maxing out your subs
anyways. Crank it up, if you hear it distorting, back off the volume a
little bit.

[KU40]

You can wire it to 2 ohms, just be aware of when the sub starts
stressing and stop turning the gain up. If you're careful you will
have no problems (I have overmatched amp power to subs many times and
had no problem). But it wouldn't be too hard to blow the sub if you're
not careful, so........be careful. ha


--
KU40

[jimbo_limited]

> The amplifier specs states its Rated 500w RMS @ 4 Ohm Load, 1000w MAX @
> 2 Ohm and 800w RMS @ 2 Ohm. My subwoofer is a 500w RMS DVC 4Ohm. Can i
> wire my sub to an 8 ohm and wire it to the amp? (Cant find any 8 ohm
> specs on this amp) Or can i wire it to 2 ohm safely? But since this
> amp supplies 800w rms on a 2 ohm load will this blow my subwoofer?
> What can i do to wire this sub safely to the amp.

Wire the sub's VC's in parallel, making a 2ohm load, and bridge your
amp. If you wire the sub in series, it'll be 8ohms, and your amp
will only push about 250rms into it. You're better off going larger
than smaller, music isn't gonna be constantly maxing out your subs
anyways. Crank it up, if you hear it distorting, back off the volume a
little bit.


It is better going with 2 ohm than 8 ohm. Now my amplifier is a monoblock amp. Only one channel and not able to bridge. = /




You can wire it to 2 ohms, just be aware of when the sub starts
stressing and stop turning the gain up. If you're careful you will
have no problems (I have overmatched amp power to subs many times and
had no problem). But it wouldn't be too hard to blow the sub if you're
not careful, so........be careful. ha


--
KU40



I understand that but i have a question. Since this subwoofer is brand new and havent been "broken" in, wont powering the sub when trying to set the gain properly damage the VC's?

[D.Kreft]

On Jan 12, 9:49 pm, jimbo_limited
> wrote:

> I understand that but i have a question. Since this subwoofer is brand
> new and havent been "broken" in, wont powering the sub when trying to
> set the gain properly damage the VC's?

When you "break-in" a subwoofer, you "break-in" the suspension, not the
voice coil. Having installed many, many brand-new, out-of-the-box subs
in my time, I can say with great confidence that you're not going to
damage them in the way described. After all, if that were the case,
you'd get your stereo installed on Wednesday and then have to go back a
week later to get your gains set....not too practical.

-dan