voice coil question

[TeenWolf 10+ year member]

if he knows what i said was wrong he's right to correct me as i am learning also

Jmac was more than likely directing the "you're wrong" statement at me - not you.

You're right - it's good to correct people who are learning. But this is just non-sense. There are too many rebels on here who think they know more than the people who write the manuals. I've been using this site for less than a week and I've seen this crap everyday.

Take this site with a grain of salt, but don't get me wrong, I've seen some really good posts here too - it's not all bad.

 

[jujumantb 10+ year member]

Take this site with a grain of salt.

These guys DO know what they are talking about, they wont steer you wrong, they just tend to get over-technical and it makes it confusing for guys still trying to grasp the basics.

 

[squeak9798 5,000+ posts]

who is correct:
Jmac or Squeak or both???

Haha...I said the same thing Jmac did, only in a different way //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif Kinda like the glass half full/glass half empty scenario.

 

[creater 10+ year member]

OH...hahaha...

 

[TeenWolf 10+ year member]

These guys DO know what they are talking about, they wont steer you wrong, they just tend to get over-technical and it makes it confusing for guys still trying to grasp the basics.

And what's the point in getting all technical with newbies? The guy asked a simple question, he was giving a general rule of thumb answer that he would find in his manual, and Jmac repsonds with "not true" and doesn't even suggest an answer that he believes to be true. How does the help the guy in any way?

 

[jujumantb 10+ year member]

And what's the point in getting all technical with newbies? The guy asked a simple question, he was giving a general rule of thumb answer that he would find in his manual, and Jmac repsonds with "not true" and doesn't even suggest an answer that he believes to be true. How does the help the guy in any way?

Thats Jmac for ya //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif But seriously can you blame him? This is a forum of mostly "newbies", reading the same old basic questions over and over is not very stimulating, sometimes you just have to find something minutely wrong and have a good technical discussion about it, thats how I feel atleastm those are the only times I learn new things.

 

[creater 10+ year member]

Thats Jmac for ya //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif But seriously can you blame him? This is a forum of mostly "newbies", reading the same old basic questions over and over is not very stimulating, sometimes you just have to find something minutely wrong and have a good technical discussion about it, thats how I feel atleastm those are the only times I learn new things.

very true

 

[squeak9798 5,000+ posts]

There are too many rebels on here who think they know more than the people who write the manuals.

It isn't hard to prove what Jmac and I said.

Birthsheet here that proves it: http://forums.caraudio.com/vb/showpost.php?p=970168&postcount=12

And here: http://forums.caraudio.com/vb/showpost.php?p=982879&postcount=14

And here: http://www.soundsolutionsaudio.com/forum/index.php?amp;showtopic=1323&view=findpost&p=10401

And here: http://www.soundsolutionsaudio.com/forum/index.php?amp;showtopic=1323&view=findpost&p=10403

There's measured proof. And that was without even looking too hard.......

 

[squeak9798 5,000+ posts]

BTW, we aren't getting "overly technical" for the newbs. Them being n00bs is exactly the reason to be "technical"....so they aren't just starting out and learning, and being taught or told inaccurate or wrong information. It's better for them to learn it now and know and understand the truth as opposed to using failed logic in the future to make decisions, and subsequently teach others that same wrong information.

 

[Insomniac119 10+ year member]

Ok you proved it good job.

 

[jujumantb 10+ year member]

Pioneer Premier GM-X1020 ...
2 x 100 RMS @ 4 ohms

2 x 150 RMS @ 2 ohms

1 x 300 RMS @ 4 ohms

Where did the extra 50 watts @ 2 ohms and 100 watts @ 4 ohms go ? 1.3 dB isn't audible ?

JBL BP1200.1 ...

1 x 600 RMS @ 4 ohms

1 x 1200 RMS @ 2 ohms

1 x 1200 RMS @ 1 ohm

Where did the additional 1200 watts @ 1 ohm go ? 3 dB isn't audible ?

Pioneer Premier PRS-X320 ...

Rated Power:

2 x 50 RMS @ 4 ohms

2 x 100 RMS @ 2 ohms

1 x 200 RMS @ 4 ohms

Actual Power:

2 x 127 RMS @ 4 ohms

2 x 215 RMS @ 2 ohms

1 x 430 RMS @ 4 ohms

Not doubled or halved as rated and almost a 1 dB difference if it had been halved/doubled as theorized ... 1 dB isn't audible ?

Well if we benched some of those it might show not so much of a difference, as for the JBL 2ohm vs 1ohm, I'll give you that, ok, but then why not cheat by bringing in the JL slash series aswell //content.invisioncic.com/y282845/emoticons/uhoh.gif.c07307dd22ee7e63e22fc8e9c614d1fd.gif

 

[TeenWolf 10+ year member]

BTW, we aren't getting "overly technical" for the newbs. Them being n00bs is exactly the reason to be "technical"....so they aren't just starting out and learning, and being taught or told inaccurate or wrong information. It's better for them to learn it now and know and understand the truth as opposed to using failed logic in the future to make decisions, and subsequently teach others that same wrong information.

The guy asked about rated rms in relation to ohms and you guys are getting into rated power vs actual power and birthsheets. And he probably doesn't even know the basic formula for resistance. You need to learn to crawl before you walk.

Might as well start talking about dynamic power and max power too...just to make it a little more interesting.

And why do you think manufacturers have different numbers for rated output and birthsheets? Explain it and make this a dead issue.

 

[TeenWolf 10+ year member]

Neither of these are true ... Advertised as true in many cases and close to true in most of those cases, but very rarely ever completely true ...

Proves my statement that he believes he knows more than the engineers at MTX.

Some ratings are misleading because there are a million ways to rate equipment and some manufacturers choose a format that gives them the most power.

Part of the problem here is due to all the bullshit ratings. Stick with one: rated RMS output.

 

[damanTO81 10+ year member]

ok thanks i get it i already knew it changed the watage of the amp but just wanted to know if it could also affect the subs wattage i didnt think it did just making sure the amp is 750 by 2 @ 1 ohm or 1000 by 1 @ 2 ohms or 250 by 2 @ 4 ohms

 

[TeenWolf 10+ year member]

1 x 500 watts @ 4 ohms (12.5 volts,

1 x 750 watts @ 4 ohms (14.4 volts,

1 x 1000 watts @ 2 ohms (12.5 volts,

1 x 1500 watts @ 2 ohms (14.4 volts,

Notice how the general rule applies when all other variables are constant (ie. volts)? The birthsheet states the amp was measured 1 X 1159w @ 2 ohms. Don't you think that they would get a higher measurement than 500w on the 1 X 500w @ 4 ohms? Which supports the general rule? And don't you think the amp birthsheet would be inaccurate after the amp has experienced some age, wear, and tear?

There's no doubt that MTX produces great amps that will exceed their rated output, but you need a standard format to judge and compare its performance to other amps. We know that the rated RMS output is a minimum, but trying to determine how far it will go beyond that is speculation and will vary. Maybe you give the birthsheets a lot of weight, but I don't. I didn't even read the one that came with my MTX amp. I just look at the rated RMS and know that it will not fall below this, which I can compare to other amp rated minimums.

P = E2/R

Where P is watts, E is voltage (squared), and R is resistance.

If E stays constant and you double R, then P has to be reduced by half.

If you take two measurements from a birthsheet: one at 2 ohms and the other at 4 ohms, with all other variables constant, then ohms law will apply.