m100 8ohm bridge

Need help with your car stereo system? Have a technical question? Post here.
Post Reply
User avatar
bogart
Posts: 1533
Joined: Thu Dec 18, 2008 6:30 pm
Location: SE PORTLAND

m100 8ohm bridge

Post by bogart »

Hey fella...anyone have any idea of what to expect power wise with an m100 running an 8ohm bridge...is it less then the 4ohm rating on the bridge? Here is why I ask....I've got 2 gs redline 15s that are 8ohm subs and they are rated at 500 rms 1000 dynamic...want to run them off of two m100s but if I am not going to be getting at least 75percent of the rated power to them I don't want to run em....

Have other sub options...but these are my fav out of my sub collection right now and they are new...though one was cracked in shipping and has gotten the silicone treatment...but still love them....
User avatar
kg1961
Got wood?
Posts: 9051
Joined: Sun Apr 06, 2008 10:31 pm
Location: Calgary

item

Post by kg1961 »

your not going to get the 500 I would say closer to 300watts
most of my gear is gone :liar:
2020 honda accord sport
User avatar
bogart
Posts: 1533
Joined: Thu Dec 18, 2008 6:30 pm
Location: SE PORTLAND

Post by bogart »

that is what I was afraid of...and expected really. Damn!!!
User avatar
kg1961
Got wood?
Posts: 9051
Joined: Sun Apr 06, 2008 10:31 pm
Location: Calgary

item

Post by kg1961 »

just remeber that most pg amp are under ratted so about 1/2 of 4 ohm. But if you ask there might be a way to make them work at higher power at 8ohm like the PG mac amps
most of my gear is gone :liar:
2020 honda accord sport
User avatar
bogart
Posts: 1533
Joined: Thu Dec 18, 2008 6:30 pm
Location: SE PORTLAND

Post by bogart »

it would require revamping most of the power supply so that it was optimized for 8 ohms...the mac amps don't acheive full power a 8 ohms though...they are stable to 2 ohm stereo...could just cap the subs I beleive and drop it to where ever I needed it to be...but how to go about it I am not sure.
User avatar
kg1961
Got wood?
Posts: 9051
Joined: Sun Apr 06, 2008 10:31 pm
Location: Calgary

item

Post by kg1961 »

that makes 2 of us????
most of my gear is gone :liar:
2020 honda accord sport
User avatar
bogart
Posts: 1533
Joined: Thu Dec 18, 2008 6:30 pm
Location: SE PORTLAND

Post by bogart »

what I really need is an ms 2250 to run the 15s on a 4 ohm bridge....don't want to stray from the class a amps on this one. Or a zpa.5...but damn that is just too much money now...after all this it is going to come to 10s...10s!!!!!

How oh so very disappointing :cry:
User avatar
fuzzysnuggleduck
Soy Milquetoast
Posts: 4423
Joined: Wed Dec 06, 2006 1:08 pm
Location: The best place on earth
Contact:

Post by fuzzysnuggleduck »

The subs don't happen to be dual voice coil, huh?
SOLD: '91 PG 4Runner
User avatar
NotDeafYet
Posts: 215
Joined: Thu Nov 05, 2015 4:14 am

Re: m100 8ohm bridge

Post by NotDeafYet »

Ha - reviving an old thread.

My one sub has 4ohm DVCs. It's rated at 250WRMS. If I ran my M100 on 8ohms with my sub, I understand that the power will be around the quoted 300 watts, which is fine with me.

My question is, in running it at an 8ohm load, what will the amp current draw be? Way less than 4 and 2 ohms? In terms of sound quality, will there be any issues running it at 8ohms? Will the amp be affected in any way running it at 8ohms?

My sub is for now, but down the road, I will replace it with something else, hence why I got and will use the M100 for the sub part of the system.
User avatar
kg1961
Got wood?
Posts: 9051
Joined: Sun Apr 06, 2008 10:31 pm
Location: Calgary

Re: m100 8ohm bridge

Post by kg1961 »

NotDeafYet wrote:Ha - reviving an old thread.

My one sub has 4ohm DVCs. It's rated at 250WRMS. If I ran my M100 on 8ohms with my sub, I understand that the power will be around the quoted 300 watts, which is fine with me.

My question is, in running it at an 8ohm load, what will the amp current draw be? Way less than 4 and 2 ohms? In terms of sound quality, will there be any issues running it at 8ohms? Will the amp be affected in any way running it at 8ohms?

My sub is for now, but down the road, I will replace it with something else, hence why I got and will use the M100 for the sub part of the system.


man old post it will not affect sq at all and you will use about 1/2 the current of 4 ohm bridged
most of my gear is gone :liar:
2020 honda accord sport
User avatar
NotDeafYet
Posts: 215
Joined: Thu Nov 05, 2015 4:14 am

Re: m100 8ohm bridge

Post by NotDeafYet »

man old post it will not affect sq at all and you will use about 1/2 the current of 4 ohm bridged[/quote]

Google searching does dig up oldie threads, I know! I try to search first, then ask after.

That's what I was thinking.. 2ohms twice from 4.. 4 twice from 8. Ok, nice to know. Just asking all the questions over the winter so when spring comes, I'll have all my questions answered :)

I was thinking of powering each voice coil individually.. but I could run into some issues with having each coil powered the same. I do have a few multimeters, but I'm not sure how I would be able to measure each channel to see if they output the same... to not damage the sub. I'd rather series or parallel them. And avoid buying a new sub for either a 4ohm load, or to replace a fried one hehehe.
ttocs
the Floor Sweeping Hack with Golden Ears
Posts: 14783
Joined: Fri Dec 19, 2008 9:53 pm

Re: m100 8ohm bridge

Post by ttocs »

bridge the signal either with splitters into the amps or be sure its a mono signal and you will be fine powering them separately. Its really not all that big of a deal to play the coils on a stereo signal as most home stereo systems with the sub/satallite systems run a DVC sub that plays a stereo signal. I have seen people power a DVC sub with the coils out of phase and it didn't hurt anything although they did not do it for long...
what else can I say I am a grumpy asshole most of the time.
oilworker
Posts: 227
Joined: Mon Dec 02, 2013 5:55 am

Re: m100 8ohm bridge

Post by oilworker »

I had an M100 dyno tested.
Here are the results for the certified test:
8 ohm bridged - 397 watts, 46 amp current draw
4 ohm bridged - 481 watts, 66 amp current draw

The big difference came in the dynamic power test
8 ohm bridged - 395 watts
4 ohm bridged - 701 watts
User avatar
NotDeafYet
Posts: 215
Joined: Thu Nov 05, 2015 4:14 am

Re: m100 8ohm bridge

Post by NotDeafYet »

oilworker wrote:I had an M100 dyno tested.
Here are the results for the certified test:
8 ohm bridged - 397 watts, 46 amp current draw
4 ohm bridged - 481 watts, 66 amp current draw

The big difference came in the dynamic power test
8 ohm bridged - 395 watts
4 ohm bridged - 701 watts
Awesome, that's good info to have on hand. Got any other M series dyno numbers for fun? I got M50s and an M44 in my stash with the M100.
User avatar
bigdwiz
Posts: 169
Joined: Sun Oct 24, 2010 3:12 pm
Location: Old School, USA
Contact:

Re: m100 8ohm bridge

Post by bigdwiz »

For those who like videos :P


Watch on YouTube in 1080P HD or embedded below:

Old School Car Audio Amp Tests and More:
http://www.youtube.com/BigDWiz

Also see my old school website for tests, reviews and more;
http://www.oldschoolstereo.com
User avatar
NotDeafYet
Posts: 215
Joined: Thu Nov 05, 2015 4:14 am

Re: m100 8ohm bridge

Post by NotDeafYet »

Ha. I've watched a lot of your videos. You made me want to buy an amp dyno :)
User avatar
quickrip
Posts: 156
Joined: Sun Nov 17, 2013 12:46 pm
Location: northern CA

Re: m100 8ohm bridge

Post by quickrip »

bigdwiz wrote:For those who like videos :P
Thanks for all the great videos bidwiz.
I always find myself watching dyno tests on amps i never knew i cared about. haha
Collection:
PG- m100
ms2125 (with shroud) ms275 ms250
zpa0.5
Xvr-2 crossover
bass cube (x3) & OG Elite 12D (x2)
Sony- xes-M3(x3) xes-M1 xm-7557
Diamond audio- d7104 d7056 d7402
Post Reply