Twin Alpine SWR12D4 - 8 ohm? - AVS Forum
Forum Jump: 
 
Thread Tools
post #1 of 7 Old 03-16-2014, 07:59 AM - Thread Starter
Newbie
 
tstape's Avatar
 
Join Date: Jan 2008
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Just joined the forum. I hope this isn't too generic for this particular forum. Please let me know if I'm in the wrong forum, and I'll post where most appropriate.

Head unit: JVC KD-R740BT
Amp: Kenwood Kac-9105D 1800-Watt Class D Mono Amplifier
Speakers: Twin Alpine SWR-12D4, Dual 4-ohm Voice Coils
Box: Ported

The Alpine directions had me install a jumper on each speaker. This converted each to 8 ohms. I have each speaker wired to individual connector terminals on the box, so each speaker is wired to the amp separately.

Should I remove the jumper cables so the each speaker is 4 ohms, and still run individual speaker wires to the amp?

Should I wire the speakers together (changing ohms) and only run one speaker wire to the amp?

If I wire the speakers together, should I wire outside the box (it's ported so I'm not sure about running wires through the center walls)?
tstape is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 03-16-2014, 09:34 AM
Member
 
Bombelman's Avatar
 
Join Date: Nov 2013
Location: Paramaribo
Posts: 181
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 33
I would not wire it in 8ohms, no much power from the amp that way.
Your Kenwood amp is 1 ohm stable so you can wire all positive terminals together to the positive terminal on the amp. Same goes for the negative leads

Bombelman is offline  
post #3 of 7 Old 03-16-2014, 02:20 PM - Thread Starter
Newbie
 
tstape's Avatar
 
Join Date: Jan 2008
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Rewired per your suggestion to 1ohm, then set the gain using a multimeter. Much better. Thank you.
tstape is offline  
post #4 of 7 Old 03-16-2014, 02:31 PM
Member
 
Bombelman's Avatar
 
Join Date: Nov 2013
Location: Paramaribo
Posts: 181
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 33
Quote:
Originally Posted by tstape View Post

Rewired per your suggestion to 1ohm, then set the gain using a multimeter. Much better. Thank you.

You're welcome !
According to the Kenwood specs, your amp is 1-ohm stable.
This amp will deliver more power to the subs in 1-ohm, than 2, 4 or 8 ohms...

Because you are running this amp at max capacity, do make sure you're not overheating it and make sure your wires are of sufficient size, 1-ohm can melt things pretty quickly (don't ask how I know this biggrin.gif )

Just finished my 2x Dual 4-Ohm Pioneer TS-W3003D4 subs also, in a 1-ohm load to the amp.

Kenwood specs source: http://www.kenwoodusa.com/car_entertainment/amplifiers/kac-9105d
Bombelman is offline  
post #5 of 7 Old 03-16-2014, 02:41 PM - Thread Starter
Newbie
 
tstape's Avatar
 
Join Date: Jan 2008
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Now I am nervous. I bought a kit for the wiring. 4 gauge for battery and ground. 14 gauge for speakers. Is that enough?

I thought running at 8 ohm would be harder on the amp, cause it need to work harder to push through?
tstape is offline  
post #6 of 7 Old 03-16-2014, 02:57 PM
Member
 
Bombelman's Avatar
 
Join Date: Nov 2013
Location: Paramaribo
Posts: 181
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 33
I don't even think it could handle 8-ohm, but see it this way, in 1-ohm your amp is pushing more Watts to the subs.
4ga for power is great, as is 14ga for your subs ;-)
Class-D amps don't get hot like Class-A/B, don't you worry... biggrin.gif

Happy Thumpin' !!
Bombelman is offline  
post #7 of 7 Old 03-16-2014, 03:53 PM - Thread Starter
Newbie
 
tstape's Avatar
 
Join Date: Jan 2008
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Thanks, appreciate all the help.
tstape is offline  
Reply DIY Speakers and Subs

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off