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View Full Version : need advice on 6x8 speakers, candidates listed



jinroh
01-14-2007, 07:16 PM
Greetings, in short, I want to replace the front stock speakers. Original budget around $150

I narrowed down to two: Infinity Kappa vs Pioneer REV, powered by HU
REV got lots of praises in the forum, the only concern I have is whether HU is enough to shine the 91dB speakers.
In another hand, Kappa is popular, some says harsh tweeter. Its 94dB sensitivity will help when powered by HU.

So, which one? any advices or suggestions are welcome.
The speaker will be powered by Kenwood KDC-MP532U HU, (MOSFET 22 watts RMS/50 peak x 4 channels). no seperate amp.


The car is 96 grand marquis, 5x7/6x8 front, 6x9 rear I believe.

I did some research, candidates are listed below. Any advices are appreciated.

Size Brand Series Model RMS W Peak W Sens dB Freq Freq Imp Ohm

6x8c Infinity Kappa 680.7CS 90 270 94 45 25k 2
6x8 Infinity Kappa 682.7CF 100 300 94 40 25k 2

6x8 Kenwood Excelon KFC-X680 56 280 91 35 25k 4

6x8 Pioneer REV TS-D801P 60 260 91 27 32k 4

6x8c JBL Grand Touring GTO8607C 70 210 92 55 21k 2
6x8 JBL Grand Touring GTO8627 60 180 92 50 21k 2
6x8 JBL Power P8652 75 210 90 40 23k 4
6.5c JBL Power P650c 90 270 90 45 23k 4

5x7 Polk Momo MMC570 80 180 90 40 25k 4
5x7 Polk db db570 60 180 93 52 22k 4
6.5c Polk MMC 125 250 90 43 25k 4

5x7 Alpine Type-R SPR-57C 100 300
5x7 Alpine Type-S SPS-57C2 50 250 92 35 30k 4

6x8c MB Quart Reference RCE 268 60 130 90 38 32k 4
6.5c MB Quart Premier PCE 216 60 130 90 38 32k 4

Louisiana_CRX
01-14-2007, 07:17 PM
I would go with the Pioneer REV series ...those are some very nice...6x8's

jinroh
01-14-2007, 07:30 PM
I do hear from couple guys recommending REV, how is their performance compared to Infinity ref or kappa?

BTW, shall I really confine myself in 6x8, how hard to fit 6.5 speakers?

Louisiana_CRX
01-14-2007, 07:35 PM
There are adapter plates available to convert from 6x8 5x7 to 6.5's or you can build one yourself out of 1/4 MDF by uses your stock speakers as a template and cutting out your 6.5 holes ...I did that in my 96 Mustang

jinroh
01-14-2007, 07:45 PM
Thanks for details.
Any competence Pioneer REV vs infinity.
Our LHS has a infinity system, I would like to know how REV sounds compared to Infinity.

It seem no local store carries pioneer REV series, so I will rely on the buddy feedbacks.

DaveDSMer
01-14-2007, 08:08 PM
since you are going off HU power out of those I like the Type- S speakers the most.

jinroh
01-14-2007, 09:48 PM
So anyone has first hand experience of Pioneer REV powered by HU?

jinroh
01-14-2007, 10:02 PM
I narrowed down to two: Infinity Kappa vs Pioneer REV
REV got lots of praises in the forum, the only concern I have is whether HU is enough to shine the 91dB speakers.
In another hand, Kappa is popular, some says harsh tweeter. It's 94dB sensitivity will help when powered by HU.

So, which one? any advices or suggestions are welcome.

DejaWiz
01-15-2007, 09:33 PM
REVs. They sound very decent off HU power and even better when you install an amp (even a smallish 50W/ch) on down the road.

I was running a set of Pioneer 4 way 6x9's off HU power (22W rms/ch) for rears and they hit hard enough to feel a little bit in the chest....The REVs are better.

espguitarist91
01-16-2007, 12:22 AM
The kappas are 2 ohm, and i definitely wouldn't run a head unit at 2 ohms.

b0mbrman
02-19-2007, 11:36 PM
That's odd that they'd build coax's like that...

MBrock4u
02-20-2007, 06:06 AM
Kappa's are nice, but they are 2 ohm and need to be amped. I would go with either the pioneer rev's or the Alpines.

Jeremiah25
02-20-2007, 06:58 AM
I had the Kappa's and some Diamond D372i's in my car. I wasn't very impressed with either of them. The best I have used for 5x7's are the Crystal's I'm running now. I haven't ran them off of deck power, but they are far louder and better sounding than the Kappa's were off of a small 35x4 amp.

b0mbrman
02-20-2007, 12:57 PM
I had the Kappa's and some Diamond D37i's in my car. I wasn't very impressed with either of them. The best I have used for 5x7's are the Crystal's I'm running now. I haven't ran them off of deck power, but they are far louder and better sounding than the Kappa's were off of a small 35x4 amp.

Did you need an adapter for those?

I have a 98 Contour and the 5 1/4 in a 5x7 plate doesn't fit :(

Jeremiah25
02-20-2007, 03:17 PM
Did you need an adapter for those?

I have a 98 Contour and the 5 1/4 in a 5x7 plate doesn't fit :(

Need an adapter for what? Both the Kappa's and the Diamond's were regular 5x7's, and fit right in the factory 6x8(5x7) holes. The Kappa's I had were actually a 5x7 component set, and the diamonds are a biampable coax. Both of them sounded decent at first but they didn't last very long. They were both kindof low quality IMO.

I'm getting ready to redo mine again, and build door pods for a good 6.5 mid bass, but the Crystals are the best 5x7 I have found.

Gary S
02-20-2007, 04:52 PM
There are adapter plates available to convert from 6x8 5x7 to 6.5's or you can build one yourself out of 1/4 MDF by uses your stock speakers as a template and cutting out your 6.5 holes ...I did that in my 96 Mustang




- That with OZ vector components from woofersetc.com and a small amp would not go much over $150 ... it would make a world of difference.

But if you have to have the 6X8's, go with the Crystal SSX... they are a step up from the Revs.... 12db crossover on the tweeter, neo motor for more bass potential... these are the ones to buy.