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subwoofer wiring?


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smoothkeys 
Member - Posts: 2
Member spacespace
Joined: July 26, 2009
Location: Washington, United States
Posted: July 26, 2009 at 7:57 PM / IP Logged  
I have 2 Audiobahn AW1251SE these are the ratings for the subs     * Special editiion of the AW1251T
    * Comes complete with grille and special edition dust cap
    * 45 oz. Strontium Magnet
    * RMS Power Handling: 400 watts RMS
    * Peak Power Handling: 800 watts approx.
    * 2" 4-layer ASV Voice Coil
    * KM3 Coated for Virtually No Cone Distortion
    * Non-Pressed, Non-Transfer Paper Cone
    * PHAT Foam Surround
    * Non-Pressed, Non-Transfer Paper Cone
    * 2 Ohm or 8 Ohm operation per sub (1 ohm, 4 ohm, 16 ohm per pair)
    * Lug Lock Terminals
Here's my amp MTX JackHammer JH600
# mono subwoofer amplifier
# 350 watts RMS x 1 at 4 ohms (600 watts RMS x 1 at 2 ohms)
# frequency response: 20-200 Hz
# variable low-pass filter (40-200 Hz, 24 dB/octave)
# variable subsonic filter (20-50 Hz, 12 dB/octave)
# bass boost (12 dB at 40 Hz)
# Active Fan Cooling with automatic variable fan speed
# Smart Engage turns on amp when signal arrives through the speaker-level inputs
# CEA-2006 compliant
# preamp and speaker-level inputs
# 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
# fuse rating: 25A x 3
# 14-11/16"W x 2-3/8"H x 9-5/16"D
# warranty: 1 year
My issue how would i wire my dvc subs to 2 ohm on a mono block ++,--?. Will the setup be safe or impedance be correct ? Also my amp is stable at 2ohm, Each speaker is stable at 2ohm separately but as a pair would they safe at 2ohm? Is it possible to wire the pair to present a two ohm load to the amp and everything be ok ?
please help me..
i am an idiot 
Platinum - Posts: 13,667
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: July 26, 2009 at 8:30 PM / IP Logged  

Your only safe and reasonable option is as follows:

Option 2 (series/parallel) = 4 ohm load
Voice coils wired in series, speakers wired in parallel
Recommended Amplifier: Stable at 4, 2, or 1 ohm mono
subwoofer wiring? -- posted image.

Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB
spmpdr 
Copper - Posts: 456
Copper spacespace
Joined: March 22, 2009
Location: Oregon, United States
Posted: July 27, 2009 at 12:13 PM / IP Logged  
OR you could wire them as if they were svc 4ohm and short the unused coil on each sub.That would give you a 2ohm load . And yes it is safe to do.
-A vision without a plan is just a hallucination-
mike swanson 
Copper - Posts: 290
Copper spacespace
Joined: January 28, 2003
Location: United States
Posted: July 27, 2009 at 3:54 PM / IP Logged  
spmpdr wrote:
OR you could wire them as if they were svc 4ohm and short the unused coil on each sub.That would give you a 2ohm load . And yes it is safe to do.
Short the unused??? Why?
just leave it open
haemphyst 
Platinum - Posts: 5,054
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: July 27, 2009 at 8:46 PM / IP Logged  
Wire the voice coils in series, for 8 ohms, then parallel them... Present a 4-ohm load to the amplifier, get EXACTLY THE SAME OUTPUT as the paralleled wiring, reduce your distortion, improve your damping factor, improve your headroom, and improve your efficiency.
That's where *I* would go.
However, were you to go with the single voice coil route, it is better to short the second one, as this will give you results that are closer to the published T/S parameters.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

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