Momo MMC650 MMC690 Alpine MRVF540

Akirasle

So I have this amazing Alpine MRVF540 and a set of MMC650 and MMC690.

I have the system sounding clean but I want to make sure I am getting the most out of it as far power handling. I am using a Pioneer DEHP7800MP.

My current settings:

Deck crossovers on pass
AMP Crossovers set to 75hz each
GAIN 1/4 way up.

It seems to me that I could be getting more power to them but they start distorting, is this amp just too much for them or should I be able to give them more power?

Any suggestions ?

Akirasle

I just reached half gain on the amp with no distortion. I tuned the crossover on the amp to roughly 80hz. That 5hz difference made a huge impact overall.

eloplayspolo

that amp isnt even close to being "too powerfull"

Akirasle

If thats true then these things can handle a ton of power. Im pushing right around 100RMS with this amp.

Problem:

The highs (symbol crashes) begin to flutter at high volume.

Settings:

EQ on the deck is only +2 @8khz so I know the EQ isn't set out of line.

Loud is turned off.

= wondering if TOO much power.

Reason I'm on THIS forum is for advice from someone that uses THESE speakers with SIMILAR power.

I would like to know if I can get MORE out of them @ an SQ level.

Also not running a sub right now. I have a 10"W6V2 in the closet just waiting to be hooked to my MRD-M500 . Also have an MRV-T320 which I was thinking about using to power my MMC690's with.

I'll wait patiently

MacLeod

100 watts RMS is not too much power for those speakers. If you were overdriving the speakers, youd more than likely hear it in the midbass department first by the midrange bottoming out. If youve got the gain set to halfway I doubt youre running out of clean power.

What kind of music are you listening to? If youre listening to metal or hard rock, that kind of music doesnt stay clean for long and its very easy to get it sounding way too harsh as its all high end frequencies and the guitars are amplified with distortion. Stick in some nice smooth jazz and crank the volume and see if anything distorts.

Im assuming that your "EQ" is only a treble and bass control with the option to center the frequency and youve got it centered on 8 KHz? If this is the case, then that would probably be too much boost. With it centered on 8 KHz, its also boosting 4-12 KHz which is right where the brassy and harsh sounding frequencies are. Try bumping it down to -1 or -2 and see what happens.

Akirasle

The 7800MP is actually a 16 band EQ with compression, time correction etc which I have all those features turned off to have the most natural recording sound reproduction. I already have the 5k and 8k pulled down pretty far. When I am watching movies it sounds wonderful but not so hot with rock but like you said, rock gets harsh very fast. Jazz sounds clean like a cool cat too.

the only thing I notice is the treble breaking up (ALL audio) at very high volume and the bass is fine, my eq in the bottom end is mellow with the only frequency above "0" being 80hz @ +1. The mids are all bellow "0" and the only high above 0 is 10&12k @ +1. So my EQ is not even set above FLAT in most areas.

The installation is perfect, triple checked by myself and I do this for a living. I have no doubts about my equipment or installation. My only question is,

"is this normal for these speakers to sound this way with what I have"

if thats the case then I will be happy and stop trying to get more out of it. its like a curse.

just would like some feedback from peeps that run these or have used them with similar power.

Akirasle

delete

MacLeod

Momo speakers can lean to the bright side out of the box so thats gonna be a problem from the start but Ive run MMC690's and MM6's for a couple years each and was able to get them to sound outstanding and there is no reason you shouldnt be able to get yours to either.

Right off the bat, Id say youre EQ'ing needs some work. I agree that you should turn off all the "auto" tuning crap like Media Expander and whatever but you should definitely be using your EQ. Youve got to overcome all the crap inside your car that is detrimental to SQ such as harsh glass, plastic everything and so on.

Here is what I see wrong - having bright speakers but having the midrange cut, then 10-12 KHz boosted even by 1 db and everything else flat doesnt seem right to me. Since you cant attenuate the tweeters, attenuate their frequencies instead. Start about 2 KHz and cut it by 3db and see how that sounds. Then move up to 2.5, then 3.2 and so on. Since youre an installer, if you have access to an RTA you might wanna slap it in your ride and see what kind of curve youre getting. Id wager, your lower and midrange are low and your high end is a lot higher.

Something else, disconnect the tweeters on the rear speakers, you dont need them. Id judt unplug them and turn down the gain on the rear some so that the front speakers are carrying most of the stage. See what that does.

This is actually where the fun is for me. I hate installing. Hate it with a passion - but I love the tuning.

Akirasle

haha yes the tweaking.. it is an audiophiles curse. I like the Idea of disconnecting the rear tweets. I am going to try that out.


this is my current EQ settings.

20HZ -3
31.5HZ -3
50hz -3
80hz +1
125hz -2
200hz -3
315hz -3
500hz -3
800hz -4
1.25khz -4
2khz -4
3.15khz -1
5khz -2
8khz +2
12.5khz +3
20khz 0

It does look strange trust me, but I have sat in my car multiple times for hours straight trying to level this out. This seems to be working the best so far but if you have some suggestions MacLeod by all means.

MacLeod

That doesnt look as strange as I thought.

Kinda odd to see 20 and 31 Hz cut tho. 50 Hz too.

500 and 800 - ya dont like how they sound maybe flat?

Still think you might want to drop 3.15 and up a couple more DB's. This would be like attenuating the tweeters.

If you can get some RTA time, that would be a big help.

If you cant get your hands on one, and enjoy tweaking, invest in a Radio Shack SPL meter and get you a CD with some filtered pink noise at 1/3 octave. This is a poor mans RTA. By playing the test tones one by one and recording their SPL level, you can find peaks and dips that shouldnt be there.

Akirasle

UPDATE:

Bridged my MRV-F540 to 2channel 150W RMS @ 4ohm to my MMC690
Dedicated my MRV-T320 80W RMS @ 4ohm to my MMC650

Holly Mother of GOD!!!!

I am impressed with these MOMO speakers now... best sound I have EVER heard from a mid driver.