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the12volt's install bay
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 Topic: amplifier, sub wiring ( Topic Closed)
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Dk888
Joined: April 07, 2005
Location:
United States
Posts: 6 |
| Posted: January 12, 2008 at 7:35 PM - IP Logged |
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I have an old school RF Power 1100a2 and MTX 81000D Mono D amplifier. Which is better to power my subwoofers?
Let's assume that the MTX is a better choice...
1) What is the best way to wire my subwoofers to get the most power out of the MTX 81000D? I have (2) AudioPipe TXX-AP10W 10' subwoofers, rated at 1200W each, 4 ohm, dual voice coil.
Currently I have the subwoofers wired down to 2ohms individually, in a ported enclosure and do not have 14.4VDC.
500 Watts RMS/CH x 1 into 4 Ohms <2% THD+N
1000 Watts RMS/CH x 1 into 2 Ohms <2% THD+N
1500 Watts Dynamic Power x 1 into 2 Ohms (14.4VDC)
2) The amplifier is a Class D mono amplifier. I noticed that there is (4) terminal outputs for speakers. The only indications of outputs are (+/-) (+/-) next to the remote wire in lead. In conjunction with this, do I bridge it and how? OR, do I wire each subwoofer at 2 Ohms directly into each of the two +/- inputs? Someone told me that by doing so, it will bring it down to 1 Ohm since the subwoofers are wired to 2 Ohm.
3) Lastly, the amp recommends using 0 AWG power cable. I have 2 AWG wiring running to my trunk already. Will this be a problem? |
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sedate
Joined: July 03, 2004
Location:
Colorado,
United States
Posts: 1,178 |
| Posted: January 12, 2008 at 7:51 PM - IP Logged |
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Yea 2 gauge is fine. That amp has 0 gauge connectors for marketing reasons - nothing technical here.
That MTX amp looks terrible for those subs. I think the RF is probably the better choice. Why don't you link to that RF amp as well - I'm thinking it would work better for 4-ohm dvc's ... but post up some more info I seriously don't feel like hunting for it.
dk888 wrote:
| OR, do I wire each subwoofer at 2 Ohms directly into each of the two +/- inputs? Someone told me that by doing so, it will bring it down to 1 Ohm since the subwoofers are wired to 2 Ohm. |
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'Someone' is correct, it will wire for 1-ohm, which this amp does not support. This amp is not a good match for these subs . . .
___________________________________________
"I'm finished!" - Daniel Plainview |
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Dk888
Joined: April 07, 2005
Location:
United States
Posts: 6 |
| Posted: January 12, 2008 at 8:02 PM - IP Logged |
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Thanks for you prompt reply. I'm looking to sell one of the amplifiers, so I'll keep which is best for the setup. What is 4-ohm "dvc's"?
I think I listed both amplifier specs and subwoofer specs to the best of my knowledge.
MTX 81000D Mono D amp:
500 Watts RMS/CH x 1 into 4 Ohms <2% THD+N
1000 Watts RMS/CH x 1 into 2 Ohms <2% THD+N
1500 Watts Dynamic Power x 1 into 2 Ohms (14.4VDC)
RF Power 1100a2 amp:
http://www.carsound.com/review_archive/amps/1100a2chts.html
(2)AudioPipe TXX-AP10W in ported box
1200watt dual voice coil subwoofer, 4Ohms.
I can also be reached on AIM: hobbesnyc or Yahoo: iisinnedii
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Dk888
Joined: April 07, 2005
Location:
United States
Posts: 6 |
| Posted: January 12, 2008 at 8:06 PM - IP Logged |
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sedate wrote:
Yea 2 gauge is fine. That amp has 0 gauge connectors for marketing reasons - nothing technical here.
That MTX amp looks terrible for those subs. I think the RF is probably the better choice. Why don't you link to that RF amp as well - I'm thinking it would work better for 4-ohm dvc's ... but post up some more info I seriously don't feel like hunting for it.
dk888 wrote:
| OR, do I wire each subwoofer at 2 Ohms directly into each of the two +/- inputs? Someone told me that by doing so, it will bring it down to 1 Ohm since the subwoofers are wired to 2 Ohm. |
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'Someone' is correct, it will wire for 1-ohm, which this amp does not support. This amp is not a good match for these subs . . . |
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Ok.. what if I use the MTX 81000D and wired the subs to remain at 4Ohms, individually. Then connect to the amplifier, which should bring it down to 2Ohms while outputing 1000watts...if I'm correct? |
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sedate
Joined: July 03, 2004
Location:
Colorado,
United States
Posts: 1,178 |
| Posted: January 12, 2008 at 8:14 PM - IP Logged |
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dk888 wrote:
http://www.carsound.com/review_archive/amps/1100a2chts.html
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That! That amp! Use that! "nearly a kilowatt into a 4-ohm reactive load" ooooo ... perfect for you!
Beats the bejesus out of that craptacular MTX that's for shure.
Copy the bottom picture for your wiring schematic:
http://www.the12volt.com/caraudio/woofer_configurations.asp?Q=2&I=42
Dump that MTX! That thing sucks.
___________________________________________
"I'm finished!" - Daniel Plainview |
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sedate
Joined: July 03, 2004
Location:
Colorado,
United States
Posts: 1,178 |
| Posted: January 12, 2008 at 8:16 PM - IP Logged |
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dk888 wrote:
| Ok.. what if I use the MTX 81000D and wired the subs to remain at 4Ohms, individually. Then connect to the amplifier, which should bring it down to 2Ohms while outputing 1000watts...if I'm correct? |
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No. This doesn't work.
Do what I said. Subs cannot "remain at 4-ohms, individually" - it doesn't work that way.
You'll get about 90% more power from a cleaner, and even for RF, simply *better* amp.
___________________________________________
"I'm finished!" - Daniel Plainview |
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forbidden
Joined: November 01, 2003
Location:
British Columbia,
Canada
Posts: 5,174 |
| Posted: January 12, 2008 at 8:22 PM - IP Logged |
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I too would be using the Rockford amp and wire the subs in a series / parellel circuit to yield max power from the bridged outputs of the Rockford amp. That Rockford is a tank that puts out way more power than advertised. Make 100% sure that you have a good ground for this particular amp. Read my What is a Proper Ground sticky as this is the very amp that necessitated the need for the sticky in the first place.
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Rob @ Forbidden Audio Ltd.
CFB Comox, BC, Canada |
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Dk888
Joined: April 07, 2005
Location:
United States
Posts: 6 |
| Posted: January 12, 2008 at 8:28 PM - IP Logged |
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Wow.. the old RF Power 1100a2 is the choice of both of you. I just picked up the MTX 81000D today! I guess I'll sell the MTX to someone and stick with the RF.
My previous setup was (2) 10'in Kicker L7's in a sealed box wired to 2 Ohms with the RF Power 1100a2. Though the L7's lasted me only 1 and half years, they kicked ass with that amp.
My knowledge with these things are not up to par. I love MTX amps, which is why I picked it up. Being that the pwr rating are nearly the same, I was hoping to get more out of the newer amp..the MTX.
Thanks! |
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Dk888
Joined: April 07, 2005
Location:
United States
Posts: 6 |
| Posted: January 12, 2008 at 8:33 PM - IP Logged |
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sedate wrote:
dk888 wrote:
http://www.carsound.com/review_archive/amps/1100a2chts.html
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That! That amp! Use that! "nearly a kilowatt into a 4-ohm reactive load" ooooo ... perfect for you!
Beats the bejesus out of that craptacular MTX that's for shure.
Copy the bottom picture for your wiring schematic:
http://www.the12volt.com/caraudio/woofer_configurations.asp?Q=2&I=42
Dump that MTX! That thing sucks.
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Ok. I'm looking at the schematic. Being that the 1100a2 is a 2 channel amp. Which diagram am I working off of from the link you sent me?
1 Ohm or 4 Ohm and when I connect it to the amp, do I bridge it or keep the channels seperate? |
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sedate
Joined: July 03, 2004
Location:
Colorado,
United States
Posts: 1,178 |
| Posted: January 12, 2008 at 8:36 PM - IP Logged |
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dk888 wrote:
| Being that the pwr rating are nearly the same, I was hoping to get more out of the newer amp..the MTX. |
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The power ratings for these amps may look numerically similar, but these are *very* different amplifiers for very different install situations. Here, it actually comes down to your woofers - if you had different (read 4ohm SVC) woofers, this would not really be as clean cut a decision (but the RF would still probably prove the better choice).
Good luck - post back with any questions or clarifications!
___________________________________________
"I'm finished!" - Daniel Plainview |
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