sub enclosure, amp wiring

Oh my vehical is an 2001 alero and i have a 2.5 f. cap for the amps

First of all, MAXIMUM LOAD (or if you prefer minimum impedance) is not necessarily "optimal". In fact, it is decidedly NON-optimal. Inefficient, poor damping, higher distortion...

Secondly, two, DVC 4-ohm woofers will offer you the following impedances: 16-ohms, 4-ohms, and 1-ohm.

Are the amps "strappable"? If not, you are relegated to one amp per woofer, and wiring the woofers to 2-ohms. If strappable, you can only SAFELY use the 4-ohm or 16-ohm wiring options. At those options, your amplifiers when strapped will (effectively) be loaded with 2-ohms or 8-ohms per amplifier, respectively.

These are what you've got!

yes the amps are strappable. Master and slave. im not sure if i know exactley what ure post meant.? here are the amps specs.

Amplifier Class	D
Number of Channels	1 - Mono
RMS Power (4 ohms)	400 watts x 1 channel
RMS Power (2 ohms)	600 watts x 1 channel
RMS Power (1 ohm)	1200 watts x 1 channel
Bridged RMS Power	N/A
Total RMS Power Output	1200 watts
Peak Power Output	2400 watts x 1 channel
Total Peak Power Output	2400 watts
Minimum Impedance Unbridged	1 ohms
Minimum Impedance Bridged	Not Bridgeable ohms
THD at Rated RMS Power	1%
Speaker Level Inputs	No
Preamp Outputs	1 pair
Built-in Crossover	Low-pass (LP)
High-Pass Crossover Frequency	N/A
Low-Pass Crossover Frequency	30 - 250 Hz
Subsonic Filter	On / Off
Signal-to-Noise Ratio	N/A
Channel Separation	N/A
Bass Boost	0 - 8 dB
Bass/Gain Remote	Yes
Fan Cooled	Optional (Accessory is required)
Fuse Rating	30A x 3

Class-D Monoblock Amplifier

Super-efficient Class D PWM design runs much cooler than conventional amps

RMS Power Output:

• 400 watts x 1 chan. @ 4 ohms
• 800 watts x 1 chan. @ 2 ohms
• 1200 watts x 1 chan. @ 1 ohm

High-speed MOSFET switching power supply

High-current complimentary Class D MOSFET outputs stable into one ohm loads

Thermal, DC offset, reverse polarity, and short circuit protection with status LED

Continuously variable 12dB/Oct low-pass crossover

Switchable 24dB/Oct. subsonic filter

Switchable 8dB bass EQ

Switchable 180° phase inversion

Remote subwoofer level control

Master/Slave Function

Variable input sensitivity: 150mV - 7.5V

Chrome-plated wire terminals and RCA connectors ensure maximum signal transfer

Rugged 2-piece heatsink and cover

RCA Outputs: 1 pair

LED/FAN Connector: provides power for optional LED light or cooling fan

Dimensions:13-1/4"L x 10-1/4"W x 2-1/4"H

here is a link to the manual online https://www.directeddealers.com/manuals/og/directed_audio/G45095.100.105.110_12-04.pdf

also when i do run master slave tou have to hook the wires up really weird to me heres a pic of what im talking bout

the manual will explane im sure. sorry to be so dumb but ive done stereos for 6 years and still when it gets done to it i still need alot of help, really i just need a pic of a wiring diagram to go by for the best results for sound. should i use just one amp?

Take that diagram above ^^^

Wire your amplifiers as instructed to strap them.

Where you see the one woofer, that is "your load". Here is where you connect your woofers; you will wire your four voice coils to a 4-ohm load (series-parallel). Follow the instructions here... Use option 2.

Your total output will be in the 1600W range, (1600 DIRECTED watts... meaning - take that power specification with a pretty big grain of salt) providing your woofers with around 400 watts each.

That's all you got. :)

thanks for the advice on that. isnt 4ohmsnot going to be nearly as load as 1 ohm?

haemphyst wrote:

---

First of all, MAXIMUM LOAD (or if you prefer, minimum impedance) is not necessarily "optimal". In fact, it is decidedly NON-optimal. Inefficient, poor damping, higher distortion...

---

YOU CANNOT GET, NOR DO YOU NECESSARILY WANT 1-OHM! For your amplifiers to "see" 1-ohm, you have to strap the amps across a 2-ohm load, which you cannot have. You have two 4-ohm DVC woofers. 1-ohm, 4-ohms and 16-ohms. Those are the net impedances available to you. In strapped mode, connected to a 4-ohm load, your amplifiers will be loaded to the equivalent of 2-ohms per amp.

Connected to the 4-ohm load, there will be LESS than 3dB difference in output (referenced to a 2-ohm load, which you cannot achieve with two 4-ohm DVC woofers), and you cannot hear that. Are you competing? Then don't worry about it. You are already going to be providing your 500W woofers with 600 to 800W each (not the 400W I previously mentioned - that was my bad). You will have plenty of power.

ok i have another post, probable a dumb question but i cant figure it out. I have 2 12" Alpine Type R DVC 4-Ohm and one Rockford fosgate punch hx2.
The specs on the alpine are as followed
     
Details:
        »      12" subwoofer with dual 4-ohm voice coils
        »      Kevlar reinforced pulp cone with Santoprene™ rubber surround
        »      cast aluminum frame with perimeter venting
        »      frequency response: 25-500 Hz
        »      power handling: 200-500 watts RMS (250 watts per coil)
        »      peak power: 1,500 watts
        »      sensitivity: 85 dB
        »      top-mount depth: 7-5/8"
        »      sealed box volume: 0.57-1.0 cu. ft.
        »      ported box volume: 0.75-2.0 cu. ft.
        »      Recommended Q-Logic Box Type: 1, 2, 3
        
and here is the fosgate specs
    * FIBERlock treated paper cone with Santoprene™ rubber surround
    * Frequency Response: 26-400 Hz
    * RMS Power Handling: 1,000 watts (500 watts per coil)
    * Peak Power Handling: 2,000 watts
    * Sensitivity: 85 dB
    * Dual Voice Coil Design (two 2-ohm voice coils)
    * Top Mount Depth 6-7/8"
    * Sealed Box Volume: 1.00 cubic feet
    * Ported Box Volume: 1.75-4.0 cubic feet
    
now my question is i just got this old box that holds three subs (12s)
and i want to use it but im not thinking it is gonna be enough cubic feet. the box is sealed on each end and is a bandpass in the center.



the box is a m.a. audio mbbp12 and im not sure of the specs its 14 inches on bottom (from front to back) 15 inches on back (from bottom to top) 42 inches long im not really sure if u ask me for a spec. mes. then i can post it.

oh ill have 2 2400d directed with a 2.5 far cap, but i dont think that matters

fosgate specs, first ones wrong

    * dual 4-ohm voice coils
    * CONsealer gasket hides mounting screws and prevents air leaks around the frame
    * frequency response 26-200 Hz
    * power range 150-500 watts RMS (250 watts per voice coil)
    * peak power 1,000 watts
    * sensitivity 88 dB SPL
    * top mount depth 5-13/16"
    * sealed box volume 0.8-4.0 cubic feet
    * ported box volume 1.75-4.0 cubic feet
    * Recommended Q-Logic Box Type: 1, 2, 3
    * 1-year warranty