QuestionI have a Kenwood DNX9140 head unit 22watts x 4 and 2 pairs of JBL GTO-627 6-1/2" speakers (2 Ohm) in the doors and I left the factory dash speakers. The above in installed in a 09 Toyota Tundra Double Cab. The quality is great at lower volumes (10 to 18) how ever when you turn the volume up (20 or above) the quality is not very good.
I don't mind adding a mono sub if it would help, however I really don't want to run new speaker wire to all the doors for a amp. I'm thinking about changing the front door speakers the the JBL P662. I would appreciate any sugestions.
AnswerJames, It depends on what you mean about sound quality. If it starts to sound blarey above 20, it may be that the speakers are only 2 ohms. Most headunits are designed for a minimum of 4 ohms per channel. Any lower ohms would cause the amp (built-in) to become hot and unstable. Essentially, it will blow the amp if played too loud for too long. I have done a little research, and I can not find anywhere that tells how low your model actually is stable to. Also, if it is stable to 2 ohms, is the stereo set for all of your truck's dimensions and speaker sizes? I have a similar model, and it sounds very clear up to 26 - 28, then it sounds like the amp (built-in)is maxed out. To maximize volume with a standard setup, I would get speakers that are built with the lowest ohms compatible with your head unit and get speakers that have the highest signal-to-noise ratio (sensitivity) in decibals.
Beyond that, if you are not satisfied with the overall volume of your system. You have two options. Most times, if you add a subwoofer to your system, you can turn the bass down that is going to the normal speakers and let them get louder than they already are. To test this, you can just turn the bass down now, then crank it up. It will sound very tinny and high, but it should sound quite a bit louder than normal. With the added "powered" subwoofer, the system will sound as boomy as you like. No need to worry about sounding tinny after the sub has been added. You would not have to connect all door speakers to an amp to do this. You would have to get signal from one or two channels, but that is it. Your second option would be to add an amp to your aftermarket OEM replacement speakers. Most aftermarket speakers can handle over 50 watts rms, so adding a 50 watt rms per channel amp to your system will double the power. So, the sound will be very similar to what you are hearing now, but louder. If it is bassy enough the way it is, this may be an option. If they already sound not bassy enough, this option will not solve the problem. You will need to add the subwoofer. Hope this helps, Scott
