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  #1  
Old 06-18-2013, 10:23 PM
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Default Slowing music q's

Idk why it would, but does slowing music with audacity introduce clipping? Or is this my own fault for sending a dirty signal. Original song clipped already? (Some were decaf) I ask cause I got my sp4 in today and last night I slowed a bunch of songs from 26-31hz and it's killing it right now, but after 10 minutes the dust cap was a little warm, back the gain off?

Specs

1 fi sp4 15

Box- 5.33 cubes tuned at 28.76hz

Temporary amp for long drive this weekend is a ss rub1.1600

Ssf is set around what is guess to be 21-22hz
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Old 06-18-2013, 10:47 PM
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Edit:
Didn't see what you were tuned to.

Could be getting warm cuz it's not broken in yet.
Try free airing it for a couple hours on like a 20hz tone.
Then try it in the box again
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Last edited by blkbeater; 06-18-2013 at 10:52 PM.
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Old 06-18-2013, 11:04 PM
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Quote:
Originally Posted by blkbeater View Post
Edit:
Didn't see what you were tuned to.

Could be getting warm cuz it's not broken in yet.
Try free airing it for a couple hours on like a 20hz tone.
Then try it in the box again
Hmm so it's not from playing to low right? I don't really have the time for that before our trip :/ any other reasons? It's not like it was hot, just slightly warm
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Old 06-18-2013, 11:13 PM
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Idk if its normal, but the dual 1.27's gave me 1ohm. Is that right??
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Old 06-19-2013, 12:49 AM
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Lower notes draw more current therefore your voltage drops more, which can cause clipping. You're sub isn't cycling as quickly, but in general kind of "mindstate" you can think in is lower = longer, therefore the woofer needs more hard push energy because the moving parts have to move further in a single stroke. But kind of, depends on box tuning. Play below tuning can cause your voice coil to heat up more quickly as well.

If it's just warm though, you are fine. They are meant to get warm, even like really really warm. There is a threshold, but you have a high quality woofer built for abuse.
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Old 06-19-2013, 01:00 AM
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If your SSF is at 22, then it's still going to let a decent amount of 22hz and even under that pass. it's not like you set it to 30hz and it will be a perfect filter. You gotta go up a bit. set it to at LEAST what your box is tuned at. Yes, it's not going to be as loud...do you wanna play loud for a few minutes or have the subs last?

And you need to open the song in audacity and then see if it's already clipping at first. It should show up red in the clipped parts right away.

Go into view > show clipping and make sure it's enabled. Might be different for other versions, but I'm running 2.0.3

In the red is the clipped signal which I amplified a crazy amount as an example.

Also, are you monitoring the voltage at all? You didn't mention any voltages.

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Old 06-19-2013, 01:31 AM
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Quote:
Originally Posted by jt_buck View Post
Lower notes draw more current therefore your voltage drops more, which can cause clipping. You're sub isn't cycling as quickly, but in general kind of "mindstate" you can think in is lower = longer, therefore the woofer needs more hard push energy because the moving parts have to move further in a single stroke. But kind of, depends on box tuning. Play below tuning can cause your voice coil to heat up more quickly as well.

If it's just warm though, you are fine. They are meant to get warm, even like really really warm. There is a threshold, but you have a high quality woofer built for abuse.
Quote:
Originally Posted by graham View Post
If your SSF is at 22, then it's still going to let a decent amount of 22hz and even under that pass. it's not like you set it to 30hz and it will be a perfect filter. You gotta go up a bit. set it to at LEAST what your box is tuned at. Yes, it's not going to be as loud...do you wanna play loud for a few minutes or have the subs last?

And you need to open the song in audacity and then see if it's already clipping at first. It should show up red in the clipped parts right away.

Go into view > show clipping and make sure it's enabled. Might be different for other versions, but I'm running 2.0.3

In the red is the clipped signal which I amplified a crazy amount as an example.

Also, are you monitoring the voltage at all? You didn't mention any voltages.


Thanks guys! And yeah it wasn't hot by any means at all, and the lowest my voltage saw was 12.9-13.1 at idle when coming to the stop light. Besides that 13.6-14

I backed the amp off slightly and turned my ssf up, ill play tomorrow when I go the store (7-10 minute drive) and see how she does.

Also, on this same model amp (my old one I sold, using my brothers) I ran all these same songs no prob, no hotness or burnt coil on 2 type r's.

Could it just be from the spiders being so stiff and all the extra work to get the cone and what not moving?

Lastly, how low do you think ill be ok playing below tuning? 3-4 hz? More, less?
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Old 06-19-2013, 01:08 PM
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Quote:
Originally Posted by Twitney181 View Post
Thanks guys! And yeah it wasn't hot by any means at all, and the lowest my voltage saw was 12.9-13.1 at idle when coming to the stop light. Besides that 13.6-14

I backed the amp off slightly and turned my ssf up, ill play tomorrow when I go the store (7-10 minute drive) and see how she does.

Also, on this same model amp (my old one I sold, using my brothers) I ran all these same songs no prob, no hotness or burnt coil on 2 type r's.

Could it just be from the spiders being so stiff and all the extra work to get the cone and what not moving?

Lastly, how low do you think ill be ok playing below tuning? 3-4 hz? More, less?
It's not how low you play as much as how hard you push the woofers. I agree with what other dude said. You can up your ssf and it'll roll off a little so when you play super lows, it'll still play them just not at full volume. I'm sure there's a golden range you can find. Your voltage is pretty decent so I wouldn't worry too much about bad voltage.
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Old 06-19-2013, 01:19 PM
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nothing wrong with a warm dust cap, hot is another thing
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Old 06-19-2013, 01:34 PM
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Quote:
Originally Posted by jt_buck View Post
It's not how low you play as much as how hard you push the woofers. I agree with what other dude said. You can up your ssf and it'll roll off a little so when you play super lows, it'll still play them just not at full volume. I'm sure there's a golden range you can find. Your voltage is pretty decent so I wouldn't worry too much about bad voltage.
Quote:
Originally Posted by tacomaguy1 View Post
nothing wrong with a warm dust cap, hot is another thing
Well I upped the ssf slightly and turned the gain down a tad and then went on an hour drive and she didn't even heat up at all
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