I've heard positioning your subs to fire straight down improves bass response...how does that work??

Just got a Rockford Fosgate FFS1224...DVC 12" sub....just want a good reliable box..."cheap"

 

Firing the sub up or down can give you a little additional bass since you are added by gravity. I personally don't think firing up or down gets you enough to stress over it.

The recommended sealed enclosure for that box is 1 cube. This is the size of the cheap prefab 12" sub boxes, and can be had for 30-50 dollars at many places. If you get one try to find one made of MDF instead of particle board. If you want a good custom box, send me a PM.

 

I ended up getting one from Pacific Stereo (on Sepulveda Blvd in Culver City) for $45 out the door. Just got a grille for it too. Now I have an amp wiring question. I lost my RF amp's manual and my logic. OK, the sub's DVC....4ohm each VC. I was told to wire in series.......then "bridge" the amp running it mono. Will the amp (a Rockford Fosgate 400S) see the load as 8ohm or 4ohms??

 

8

8 ohms bridged is the same power as the double the 4 ohm power from one channel.

 

So how can I make it see the load as 4ohms?? Wire in parallel?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MestizoRacer310 &raquo;</TD></TR><TR><TD CLASS="quote">So how can I make it see the load as 4ohms?? Wire in parallel?</TD></TR></TABLE>

You can't.....with a sub with dual 4 ohm coils your only options are a 2 ohm mono load or an 8 ohm mono load - neither are optimal for your amp.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rcurley55 &raquo;</TD></TR><TR><TD CLASS="quote">

You can't.....with a sub with dual 4 ohm coils your only options are a 2 ohm mono load or an 8 ohm mono load - neither are optimal for your amp.</TD></TR></TABLE>
Can anyone concur w/ that?? If so........the sub's up for sale.......just got it new off a trade (for my 2 12W0's)........just got the box.....

 

Also thought of this.......can't I just wire up one of the coils and leave the other one not connected??

 

What he says is correct. You can get 2 or 8 ohms. I have no idea on your amp specs though. You should get 200 watts at 8 ohm bridged. The sub may still be useable.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vteg &raquo;</TD></TR><TR><TD CLASS="quote">What he says is correct. You can get 2 or 8 ohms. I have no idea on your amp specs though. You should get 200 watts at 8 ohm bridged. The sub may still be useable.</TD></TR></TABLE>
Here are the amp's specs:
Performance
RMS Power Output (Watts x Channels) 100 x 2
Frequency Response 20-20k Hz
THD at Rated RMS Power 0.05%
Signal to Noise Ratio 100 dB
Input Voltage 14.4v
Peak Power Output (Watts x Channels) N/A
Power at 2 Ohms (Watts x Channels) 200 x 2
Bridged Power (Watts x Channels) 400 x 1
Minimum Impedance Bridged 4
Minimum Impedance Unbridged 2
Features
Amplifier Class AB
Tri-Way Capable Yes
Low-Pass Crossover Frequency 50-210Hz
Low-Pass Slope (dB/octave) 12dB
High-Pass Crossover Frequency 50-210Hz
High-Pass Slope (dB/octave) 12dB
Bass Boost 0-18dB
Bass Boost Frequency 45Hz
Fan Cooled No
Fuse Rating 40 x 1
Speaker Level Inputs Yes
Preamp Outputs No
LED Power Indicator LED-end
Height (inches) 2-1/2
Width (inches) 12-13/16
Length (inches) 9-13/16
Parts Warranty 2 Years
Labor Warranty 2 Years

 

Check to see if you can trade the sub for a dual 2 ohm version if it is available.

 

just slap the two coil together it wil be fine
(add a fan if u full blast 4 more than an hour)

if u want the most out of ur speaker a big ported box will be best.

put it this way in a db drag double point event in sacermento i made 150.2 dbs with 1 12" speaker
but the box is 7.4 cubics

 

vteg: i ended up just swapping a friend for a 12" jbl....i'm not going for competition but for personal pleasure.

tomtom: my amp can't handle the 2 or 8 ohm load (except it would supply 200watts through a parallel wiring on one channel...) I'm using a box that offers 1 cube of volume.

 

Hey guys, My Name is Mack and I work for Sound Waves in Memphis, Tn.
Down firing subs increases the distance from the speaker to you ear. Bass waves are so long it simply takes a long time for them to develop. If you have a (trunk) the subs are louder when faceing to the rear. In a (truck) down firing them does the same thing. Thanks Mack

 

I KNOW UR AMP SAYS LOWERST MONO IMPENDANCE IS 4 OHMS
BUT ROCKFORD MADE IT TO TAKE MORE TORTURE!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tomtomloc &raquo;</TD></TR><TR><TD CLASS="quote">I KNOW UR AMP SAYS LOWERST MONO IMPENDANCE IS 4 OHMS
BUT ROCKFORD MADE IT TO TAKE MORE TORTURE!</TD></TR></TABLE>

I would not recommend bridging that amp into a 2 ohm load.