JBL GTO 627 2 Ohm Speakers

Hi there let me start by saying I am new to the forum but i have been reading here for a while lots of good info. Now that my butt kissing is done let me start, I have a 2007 Chevy Silverado Reg Cab and I want to put in a set JBL GTO 627 6.5 2 ohm and a set of JBL GTO 6427 also 2 ohm 4x6 speakers, I have a Alpine CDA 9857 Head Unit. Can I run these off my head unit? Will I cook the headunit? I have had a shop tell me JBL wouldn't make them if I couldn't, but I would like a secound opinion.
Thanks

I have run 2ohm loads to deck power. One problem I encountered was clipping at higer volumes, but the sound was fine at moderate listening levels.

The next problem is heat. The deck is going to operate hotter, even if it can handle a 2 ohm load, and the area where the deck mounts only adds to this problem.

If your heart is set on these speakers use a 2 ohm stable amp (which about all of them are).

Not only might this save your deck, but it will sound alot better in my opinion, those speakers probably love power.

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Some of us happen to be on both forums.......I am MR2NR on CCA for example. Like I mentioned on the other site, that would be a resounding not a good idea.

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Top Secret, I can tell you but then my wife will kill me.

Save up some money and buy an amplifier.  Amplification doesn't necessarily equate with obnoxiously loud volume levels...just keep the volume down.  The head unit will perform as it is intended for and the component speakers will get the power they need for performance.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

Alpine rates their head units at 4-ohms loads, just like most manufacturers.  And whatever shop told you "JBL wouldn't make them if I couldn't" is a shop I would never step foot into again.

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BTW, JBL does not make the GTO series to be mated to a H/U but to be mated to their GTO series of amps... a GTO 75.4 II would do quite nicely... if you want to run JBL speakers off of a H/U go with the CS series or equivalent....

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Kevin Gerry
Certified Electronics Technician
MECP First Class Installer

Owner/Installer
Classic Car Audio
since 1979

master5 wrote:

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I have run 2ohm loads to deck power.

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In general this is not a good idea.  Most head units are not 2-ohm stable, although some may operate with that load for a while and as long as the volume is kept low.  I suspect you'll get about 10% distortion doing that, and run the risk of blowing the internal amplifiers.  Not wise.

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Yeah I know,

The only reason I did that was a customer was replacing the deck in his caddi which had the Bose system.(those are 2ohm from the factory) The factory amp was NG so no integration. I told the customer I didn't feel it was wise to do this without changing the speakers.

The customer stated it was just temporary and he would be back soon for upgrades. Against my better judgment (and a REALLY pushey customer) I hooked it up. Thats when I noticed all the problems I stated in my earlier post. We are in total agreement. Not reccomended to do this at all.

Thanks

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