E46 Fanatics Forum banner
  • Hey everyone! Enter your ride HERE to be a part of October's Ride of the Month Challenge!
1 - 4 of 4 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter · #1 ·
Hey guys, here's my dilemna.

I'm thinking of buying a JBL w12GTi Sub. It is only available with dual 6 ohm voice coils. I already have a US ACoustics 2150 amp. The porblem is that to get decent power out of the amp i would have to run the voice coils in parallel, which would give me 3 ohms of impedance. If i bridged the amp it would then see a 1.5 ohm load. It is only rated down to 2 ohms. I'm not really worried about frying the amp because i won't be pushing it very hard and it is an old amp anyway. My concern is that the auto-protect cicuit will kick in because the amp thinks the low impedance is actually a short across the speaker terminals.

So, in short, will my amp even power up with a 1.5 ohm load, or am i wasting my time.

BTW, I originally went looking for a Kicker Solo-Baric 12L7 but the guy at the shop is giving me a heck of a deal on this sub. MSRP is $599(I checked it on JBL's website) and he is selling it to me for $418.40 with a box.

Thanks,
DKJ
 

·
Registered
Joined
·
9 Posts
HI,

It is not a good idea to run the amp with this degree of impeadance mis-match. - See if your dealer can provide you with an impeadance transformer/x over to solve the problem. As you say, the amp may shut down due to overload protection.. In addition, sound quality may also be affected as the audio signal (output from amp) phasing will also get shifted causing a non-faithful sound reproduction - whether you can hear the shift is anybody's guess...

Hope this helps .
 

·
Registered
Joined
·
2 Posts
Discussion Starter · #4 ·
Thanks for the opinions guys. I think i'm just going to take the amp in to the stereo shop and have the guy hook it up on the test bench to see if it works before i commit to buying.

BTW, have any of yall heard one of these subs. He didn't have a test model set up because its such an expensive sub. Any good/bad feedback is greatly appreciated.

Thanks for your quick responses comsidering my low post count. I usually just lurk here, but i post some over at the 'fest.

Thanks again,
DKJ
 
1 - 4 of 4 Posts
Top