MM120 & MM124 owners:Question

Systems
Systems Posts: 14,873
edited September 2002 in Car Audio & Electronics
What amplifiers are you guys using to power these subs? I typically advise the use of the MTX THUNDER81000d. However many customers ask if they can step into the THUNDER6500d.
Has anyone tried this amp and will it work properly?


Ike
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  • sntnsupermen131
    sntnsupermen131 Posts: 1,831
    edited July 2002
    my Rockford Fosgate BD1000.1 powers my 2 mm120s great with no distortion
    great amp
    -Cody
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  • N2OInferno
    N2OInferno Posts: 3
    edited August 2002
    Yeah, the 6500D works. That's what I'm using on my sub. I kinda wanna get the 81000D but I'm strapped for cash right now, even with my CC discount. I work there too. :)
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  • Systems
    Systems Posts: 14,873
    edited August 2002
    Why are you using a class D amp to power a single sub woofer. You would be better off using the thunder8302 to power a single sub. the whole idea behind class "d" is to power 2 subs.

    Ike
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  • N2OInferno
    N2OInferno Posts: 3
    edited August 2002
    Cause that's what I had before I got the new sub. I had two MTX 6000's and I just swapped them out and put the Polk in. Now I have the MTX sub back in there cause I took the Polk back. I was out of money and couldn't afford a new amp.
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  • Thom
    Thom Posts: 723
    edited August 2002
    Originally posted by CircuitCityGuy
    Why are you using a class D amp to power a single sub woofer. You would be better off using the thunder8302 to power a single sub. the whole idea behind class "d" is to power 2 subs.

    Ike

    What do you mean?
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  • bayvanman
    bayvanman Posts: 13
    edited August 2002
    Due to financial constraints and a great deal...:)
    I'm using the Phenix Gold QX 900.1 to power a pair of MM120's.
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  • Systems
    Systems Posts: 14,873
    edited September 2002
    My mistake Thom, Mono Block would better describe the type of amp that I am talking about. The MTX Thunder6500D doesnt power a single sub any better than it would a pair because of it's mono block properties. The Thunder 8302 would be a better amp to power a single sub because the 2 channels are bridgeable (unlike with mono block amps). Class"D" has more to do with the sound quality level of the amp. Did I correct my mistake or am I still confused?


    Ike
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  • C-Man
    C-Man Posts: 307
    edited September 2002
    I think you're still confused, I thought class D just basically described a mono block amp, and meant it will draw less on your electrical than an AB. A mono block amp is already one channel... or "bridged" so it wouldn't matter if you ran one or two subs off of it, it's gonna be just as good, or better then a class AB amp. Example: if you bridged a 1000 watt AB amp to a 4 ohm sub, you'll get the power rating the amp will put out at 4 ohms... Whereas if you run one 4 ohm sub off a 1000 wattt D amp, since it is already bridged, you will get the rated power for 4 ohms from that amp also, but probably only draw around 2/3 the amperage.
    Correct me if I'm wrong. (The 2/3 was just a rough guess from what I've seen)
    "The Big C"
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  • Systems
    Systems Posts: 14,873
    edited September 2002
    With most class ab if you bridge two channels together its as if you were to have a mono block amp running at 2 ohms. because once you bridge a two channel or four channel ab amp you can run it down to two ohms. which allows an ab amp to put out its most power into a four ohm woofer, while with a mono block you will never get the true power out of it if ur just running one woofer because the lowest you will get is 4 ohms....unless you have a dualvoice coil subwoofer. Which of course polk dosesnt make on their momos!!!! ive had a bd500 and been wanting to run a new momo off of it but because of this i can only run it at 4 ohms which wont get enough power out of the amp. Polk why can u simlpy make a dual voice coil woofer like the rest of the world and help me out?
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  • automaticman
    automaticman Posts: 21
    edited September 2002
    at full volume d class and a/b amps pull about the same amount of current, but when you get down to around 3/4 volume - thats when you see a big difference in current draw
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  • C-Man
    C-Man Posts: 307
    edited September 2002
    It's still the same, if you have one 4 ohm woofer, and you bridge a two channel amp, you're still only getting a 4 ohm load, it's not going down to 2... You'd need to add a second woofer to get it down to 2 ohms... so either way, it's EXACTLY the same.
    "The Big C"
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  • Systems
    Systems Posts: 14,873
    edited September 2002
    no gkh was right, when you bridge an amp you are cutting the resistance in half. the amp would then see a two ohm load if it was a four ohm speaker. with a mono block amp its not already bridged. a four ohm speaker will show four ohms. when you add another sub in parellel it will see two ohms and will double the power.
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  • automaticman
    automaticman Posts: 21
    edited September 2002
    right, with a monoblock there is nothing to bridge. SOmetimes people get confused by the MTX d class because they have an extra set of speaker outs, but they aren't a second channel that you can bridge, they're just there to make it look cleaner when you hook up 2 subs to the amp so you don't have to double up on the terminals
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  • C-Man
    C-Man Posts: 307
    edited September 2002
    Exactly automaticman... Nothing to bridge cuz it's already one channel (mono). When you bridge an AB amp what do you get... that's right one channel (mono). Trust me gkh and Red Celica, it's exactly the same thing... You'll get half the output power from either amp with only one sub.
    "The Big C"
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  • PoweredByDodge
    PoweredByDodge Posts: 4,185
    edited September 2002
    well...

    I dont think pushing two momo's off one 6500d is a wise move.

    fact is, i ran two alpine type R 10's off a 6500d, and they're slightly higher efficiency, and they still didn't do squat. i had to bump up to a 81000d for them (gain taken down a little).

    note - all wattages below are rated at 12.5 volts ---

    However... the 6500d will do probably 600 x 1 at 2 ohms... 300 is not enough for a momo, however, the 400 x 1 it does at 4 ohms may be ok. However, which would you rather buy. Two 6500d's or one 81000d?

    Check the trade off --- you can have 400 watts of 0.75% thd power with the 6500d or you can have 600 per sub (1200 x 1 / 2) of 1.25% thd. The 8302 is an option, although not a very good one. 300 x 1 at 12 volts isn't enough for one of those speakers... hell i give my DX's that much and they would eat more. the 445 number isn't bad, but if you get anywhere near 14.4 volts let me know because i'll hire you to rewire my truck.

    What would be peachy keen one of these days is a dual coil momo --- ie dual 2 ohm / dual 4 ohm coil... that way some people who want do dump a whole buttload of subs (ie four momo 10's) onto a large 2000 watt DEI amp can do so at a stable 2 ohm load (dual 4 wired in series = 8 divided by 4 subs = 2 ohms)

    or... someone who wanted to put a 6500d on one momo could parallel the coils and get a 2 ohm load into ONE sub, thus 600 plus watts.
    The Artist formerly known as PoweredByDodge
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