c400.4 mmc6500 wiring options

csnut18

Hey everyone, right now I have a c400.4 running a mmc6500 set up front with the rear channels powering mmc650 coax set in the back of my rsx type s. This is a small car and it feels like the soundstage is getting pulled to the back when I use the mmc650's to their full potential. I find myself turning the gains on the mmc650's down so it seems useless to be amping them with the c400.4 What I want to do now is use all 4 channels on the c400.4 to power the mmc6500 component set up front. I was wondering what people on here think is the best option and what you guys think would soung best. I am thinking of just bridging the 4 channels on the c400.4 into 2 and utilizing the included mmc6500 passive crossover wired to the single input mode giving them over 200 watts each because that is what the c400.4 makes in bridged mode. I think this might be too much juice but maybe not. Another option is to use the passive crossovers that are included with the mmc6500 in dual input mode and utilize all 4 channels on the c400.4. I am not sure whether the pre eq button would be used in this setup. The last option is to just not use the included mmc6500 passive crossover and just wire the tweeters to the front channels with the drivers on the rear channels and push the pre Eq button on the c400.4


I was hoping someone could go through each option and tell me what the pros and cons of each option are. The 2 that interest me the most is bridging the amp into 2 giving each component set 200 watts and just getting rid of the crossovers with everything wired directly to the c400.4 with the pre eq. What should I do?

MacLeod

The best way would be to bi-amp. Use the front channels for the tweeters and the rear channels for the mids. This will give you the best flexibility in tuning them.

This way you could use the excellent crossover network on the 400.4 for even more tuning options.

Kenji_lim

actually i facing same problem with ur i install this sistem into suv toyota wish...hu..clarion..i setup mmc6500 component in front and rear mmc650 coaxial.with another active sub woofer at bottom the seat.amp i using is c400.4 2 channel for front another 2 channel for rear..i really confuse with the pre-eq..and the sound not balance between rear and front..tweeter put in dash-board..i feel that sound so weird..maybe the HU not good or i need to electronic closeover for best result??

csnut18

Macleod, are you saying that I should abandon the passive crossover included with the speakers and just use the pre eq in the amplifier?

MacLeod

The Pre-EQ is set up specifically to run the MMC6500's, so you can use it instead of the passive crossover if you want to.

If you want to do a lot of fine tuning yourself, skip the Pre-EQ and use the variable crossover on the amp itself.

If youre not comfortable with this then you can still use the passive as a layer of protection.

csnut18

How would running it like that compare to just bridging the amp into two channels and throwing over 200 watts at each of the front speaks? Which would sound better?

MacLeod

The difference is that you wouldnt be able to tune the tweeter level nor could you use the variable crossover. So while youd have more power, your tuning options would be a ton less.

csnut18

Ok so when would someone biamp using both sets of imputs on the included passive crossovers that come with the speakers as opposed to just hooking the tweeters and speakers right into the amplifiers outputs directly.

MacLeod

Whenever you wanted to really. If you feel comfortable that youre not going to fry the speakers go for it. The main thing that needs protection is the tweeter. You can run a mid full range all day long and itll be fine. You run 100 Hz thru a tweeter at a stout volume and you could fry it.

csnut18

Ok so just to clarify, you are saying that there is absolutely no difference between biamping the passive crossover or just hooking both tweeter and speaker directly up to the amp? You know the mmc6500 crossover has a setting for both single and dual imput as well as 2 pairs of imputs on each crossover for biamping. I was wondering why they were there if you just hook the tweet and speaks directly up to the amp during biamping. Thanks

csnut18

????

MacLeod

No Im not saying that.

If you biamp and use the passive crossover, youre still using the passive crossover points. THe benefit is that it will protect your tweeter.

If you hook the speakers directly to the amp, the crossover points are now determined by the amp.

csnut18

Ok now I got it. If I don't know what the hell I am doing I would be better off biamping with the crossover as I could fry the tweeter if too much bass gets to it. Since the pre eq button on my c400.4 takes care of that I can biamp without the crossover. Very interesting and thanks for the help. Now all I am left to do is decide between biamping without the passive crossover or bridging. I think 200 watts might be too much for mmc6500 so I am prob just gonna biamp.

Kenji_lim

can i ask...if i use 2 channel just for tweeter..the frequency from c400.4 can match these crossover??? frequency from tweeter will increase??and get noisy???

MacLeod

No. You can adjust the crossover on the 400.4 all the way up to 5.5 KHz. It could get noisey if you set it too low but keep it above 3.5 Hz and youll be fine.

Kenji_lim

thanz..that mean i have to decrease the qrefuency and another question..what frequency is the most better for the mmc 6500 mid???

MacLeod

The mid can play pretty much anything.

I wouldnt take it too far below 50 Hz as it can get sloppy and I dont know for a fact but I would say it would start rolling off around 3.5 KHz on the high end so may be good to stay below that. Just experiment.