Pops from speakers.

[h2dav 10+ year member]

Say Chris do you think this applies to say a 6X9. Do you think the manufacture list the max RMS in a free air setup because that's how there mostly used or is that a number in a box. Because I know the RMS listing for most subs (non free air) is for a bandpass box because they exert the least control over the speaker cone and cn easily cause over x. My subs handle 300 RMS in a bandpass while 500 RMS sealed. I always had the feeling for other speakers the RMS number was for free air that would partialy explain the really high max numbers on some of these speakers. By the way have you ever heard a pair of polk Momo's hooked up to a 200w X 4ch RMS amp I tried but my ears couldnt take it peace and thanks for all the info //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[maylar 10+ year member]

I emailed Kicker about the power rating of their RMB8's an here's the response:

We rate this speaker at 175 watts but we also recommend that it be used as a midbass driver. Since this is a shallow mount driver it has very limited excursion. Since lower frequencies cause more excursion it is easy to make the speaker bottom out. Even with the right amount of power. If this speaker is used as a dedicated midbass driver where lower frequencies are filtered this will not happen. Many people have the misconception that this speaker can play low because it is an 8". It is designed, marketed and recommended to be used as a midbass driver only. You can play this driver as low as 50 Hz with a 24dB/octave crossover. Don't allow it to play down into the

subwoofer range and it will not pop.

So I guess they lied about it being useful as a free-air sub. Now I gotta find another solution.

Anybody want to buy a pair of RMB8's?

 

[chris229 10+ year member]

Originally posted by h2dav ]Say Chris do you think this applies to say a 6X9. Do you think the manufacture list the max RMS in a free air setup because that's how there mostly used or is that a number in a box.

The way I see ratings is---- they are thermal numbers---- the wattage at which the coil would melt down any mechincial interference BEFORE thermal melt down is just bad designing or cost cutting-------- UNLESS it is meant to be used at higher frequencies. So it should be noted 8" subs and 6x9 that playing bass heavy music UNcrossed over to these little things is going to cause poping---- as they are meant to be highpassed

for ratings on 6X9's, mids, highs it should be thought of as free air numbers----- no need to have a sealed box when there not meant to play bass-------even if the response chart says it has output in bass range

Because I know the RMS listing for most subs (non free air) is for a bandpass box because they exert the least control over the speaker cone and cn easily cause over x.

Where did you hear that subs are tested in bandpass boxes???---4th or 6th orderdo you have any links or book names??

My subs handle 300 RMS in a bandpass while 500 RMS sealed.

who says the manufacturer or a box program?

I always had the feeling for other speakers the RMS number was for free air that would partialy explain the really high max numbers on some of these speakers.

could be but the X MAX is just a measure of how far the motor assembly can push the cone

By the way have you ever heard a pair of polk Momo's hooked up to a 200w X 4ch RMS amp I tried but my ears couldnt take it peace and thanks for all the info //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

really what size are they?

 

[chris229 10+ year member]

Originally posted by maylar I emailed Kicker about the power rating of their RMB8's an here's the response:

 

We rate this speaker at 175 watts but we also recommend that it be used as a midbass driver. Since this is a shallow mount driver it has very limited excursion. Since lower frequencies cause more excursion it is easy to make the speaker bottom out. Even with the right amount of power. If this speaker is used as a dedicated midbass driver where lower frequencies are filtered this will not happen. Many people have the misconception that this speaker can play low because it is an 8". It is designed, marketed and recommended to be used as a midbass driver only. You can play this driver as low as 50 Hz with a 24dB/octave crossover. Don't allow it to play down into the

subwoofer range and it will not pop.

 

So I guess they lied about it being useful as a free-air sub. Now I gotta find another solution.

 

Anybody want to buy a pair of RMB8's?

for every drop of one octave the cone must move 4x as much