I just purchased http://www.kenwoodusa.com/Car_Entertainment/Speakers/6.5''_Oversized_n_6.5''_Speakers/KFC-P709PS a couple weeks ago.. Grabbed a kenwood 4 channel amp and got to the install.. Now in the front doors i had 2 way 6.5" infinity's. Once i got my new speakers and amp i put those infinitys in the back and put the kenwoods up front.. So far im very disappointed. Not at the amp but the speakers.(well kind of at the amp, seems to be telling me im pushing it to hard when i crank it). I have a huge feeling its a mounting issue, but heres my story. The rear doors have enclousers built into the door and the front do not(have some polyfill behind them tho). They just have a mount but behind the speaker is nothing but the inside of the door.. 2 things here.. First off, i cant hear the "highs" at all up front.. it sounds like nothing but mids mids and more mids...good sounding mids but mids at most. When i dip my head into the back i can hear LOUD clean crisp highs from my 2 way infinitys. It almost overpowers the front speakers if you lean back just a tad. My first thought was an issue of mounting the tweeters.. So i did some hacking and heres what i came up with. http://yfrog.com/120000731j .. To be honest just looking at that picture now i regret mounting them there..they seem half way over the speaker mount and the grill in these door's are not forgiving at all.. Aside from that crappy mount job. is it one of these 2 reasons that are my problem? or both? Horrible job at mounting the tweeter Rear speakers have an enclouser and fronts do not resulting in volume and sound difference other then the speakers being different brands. Sorry for the story book!
Double check one thing for me, most Infinity speakers are 2-ohm. Your kenwoods are more than likely 4-ohm. So your Infinitys will play a little louder.
There 4-ohm. I couldnt even tell you the model of the infinitys if i tried. Ive had them for years and the boxes are long gone lol. But to double check i just went out in the pitch black with my meter just for you!
Well at least im reading the ohm rating of the speaker? And i do not have the 60.9cs's. They are reference series from at least 2.5 years ago Edit..here we go http://www.infinitysystems.com/car/...kProduct=Y&Language=ENG&Country=US&Region=USA General Size 160mm Type Coax Power Handling, RMS 60 watts Power Handling, Peak 180 watts Sensitivity (2.83V @ 1m) 92dB Frequency Response 53Hz - 21kHz Nominal Impedance 4 Ohms Mounting Depth 58mm Cutout Diameter 127mm
Your measuring DC resistance, not impedance Impedance is AC resistance and it has to be measured at a specific frequency. Impedance changes with frequency so we need a signal generator, an amplifier with an accurate 1Volt (not watt) RMS rating. We also need a 10-ohm resistor. We measure the voltage drop across the resistor. We subtract this from the 1 volt and we know what the speaker is dropping. We can now calculate the impedance. We can not measure it directly. Anyway, a voice coil impedance (resistance) decreases as frequency decreases. Resistance (Impedance) increases as frequency increases. Many car manufacures today are using 2-ohm speakers from the Factory. Many started using 2-ohm speakers in the late 90's. They just sound better. There is special equipment that can measure Impedance, but its expensive and I know of no shops locally that has anything like it. Only the local Technical College (TSTC Abilene) has one. Here is how the test is done
I didn't realize that those speakers were that old. Infinity has been making only 2-ohm speakers for over two years now. Components even longer. Kappas even longer This is the link to the new Referance series. I started installing the 2-ohm Infinitys in 2006 (thats when we started carring them). http://www.infinitysystems.com/car/products/series.aspx?SerId=REF Other manufactures are starting to follow along. JBL, Rockford for example. The problem installers would run into was that we would install new speakers and the biggest complaint was it was not as loud as it used to be. Many car manufactures were using 2-ohm speakers and when we replace it with a 4-ohm, some volume was lost. When ever we ran into this complaint we used Infinity speakers. We used Kappas at first, but they had issues (they would break). Quality was not there. We switched to Reference and problem solved.
Yeah ive narrowed my problem down to crappy mounting. I need to get a little dirty and do either a bit of fiberglassing or some wood work. Not looking forward to it because ill be switching vehicles in about 3 months but if i want to be happy for those 3 months i gotta do it. I also believe im pushing my 4 channel amp to hard to try and get that volume thats being lost floating around inside those damn doors!
I like Vikings polybagging trick. Especially since you will be changing out in 3 months. The polybagging is cheap and easy. Ima do that when i get to the fronts. Plus add some sound deadner to the door. Edesigns sells it as cheap as a buck per sq foot. From Viking: A cheap, easy and effective way to do this is what i called "polybagging" Simply using several layers heavy mill plastic, place it in the hole creating a plastic bag "dish" or enclosure.....next pack the "enclosure" with poly fill. Then secure the driver to the door. the frame of the speaker will clamp the bag layers to the door. Dont worry about having to little volume. as these speakers are generally designed to operate in free air enviorments, so that means they work exceptionally well in very small enclosures..
