Re: I set my gain with a DMM
Your ears probably got used to distortion. That or your subs can safely handle over rated RMS. What sub are you setting up and what type of enclosure?
Re: I set my gain with a DMM
Quote:
Originally Posted by
neo_styles 
Your ears probably got used to distortion. That or your subs can safely handle over rated RMS. What sub are you setting up and what type of enclosure?
2 15" 150wrms radio shack subs (don't laugh) in an atrend prefab sealed box, supposedly around 2.25 cubic feet per chamber but I've heard that they're actually around 1.6-1.7
I got another question for those who know.
When using the formula watts x resistance = volts, do the watts have to be RMS or peak?
300wrms x 4ohms = about 34.6volts
600 peak watts x 4ohms = 49volts
which one is correct for gain setting? I used the RMS method.....
Re: I set my gain with a DMM
You're running 300 rms to some cheap subs in a garbage enclosure
You're not going to get good results at all
Re: I set my gain with a DMM
Quote:
Originally Posted by
Beatin' 2 15" 150wrms radio shack subs (don't laugh) in an atrend prefab sealed box, supposedly around 2.25 cubic feet per chamber but I've heard that they're actually around 1.6-1.7
I got another question for those who know.
When using the formula watts x resistance = volts, do the watts have to be RMS or peak?
300wrms x 4ohms = about 34.6volts
600 peak watts x 4ohms = 49volts
which one is correct for gain setting? I used the RMS method.....
You want RMS. You're not getting good results based on the fact that 300W sealed on 2 subs isn't going to give you much impact at all. At least the subs are running safe now, though. Consider looking up the T-S specs on that sub and getting a ported enclosure designed around your subs. Should find the oomph you're missing.
Re: I set my gain with a DMM
If your listening to music only, you can use -3 or even -5 db tracks to set your gain.
Re: I set my gain with a DMM
Quote:
Originally Posted by
IonRL205 You're running 300 rms to some cheap subs in a garbage enclosure
You're not going to get good results at all
Dude that atrend box is huge. I could barely get it in the trunk. I could build a bigger one but it will only fit in the basement.
Quote:
You want RMS. You're not getting good results based on the fact that 300W sealed on 2 subs isn't going to give you much impact at all. At least the subs are running safe now, though. Consider looking up the T-S specs on that sub and getting a ported enclosure designed around your subs. Should find the oomph you're missing
Digging through the net, I found parameters that another guy got from the box which I lost.
here they are:
25 - 2000 Hz
91 db/1W/1m
Fs 25 Hz
QES .71
QMS 3.22
Qts .58
VAS 523.9 l
excursion 3.8 mm
further more, I'm not a fan of ported boxes.
Quote:
If your listening to music only, you can use -3 or even -5 db tracks to set your gain.
why?
Re: I set my gain with a DMM
Quote:
Originally Posted by
Beatin' Dude that atrend box is huge. I could barely get it in the trunk. I could build a bigger one but it will only fit in the basement.
Digging through the net, I found parameters that another guy got from the box which I lost.
here they are:
25 - 2000 Hz
91 db/1W/1m
Fs 25 Hz
QES .71
QMS 3.22
Qts .58
VAS 523.9 l
excursion 3.8 mm
further more, I'm not a fan of ported boxes.
why?
a prefab box is not tailored to your sub. also if you saying you dont like ported you havent heard a properly build and tuned enclosure . a prefab ported ***** of course . dont expect much output with low power on cheaper subs in a sealed box i would port them if your not planning on upgrading soon
Re: I set my gain with a DMM
Quote:
Originally Posted by
Beatin' Dude that atrend box is huge. I could barely get it in the trunk. I could build a bigger one but it will only fit in the basement.
A sealed box with 2.5 cubic feet per chamber is not huge at all. Just because you could barely fit it in your trunk doesn't really mean anything, it just means your trunk opening is small.
You're running low power to some subs that are in an enclosure that is ridiculously small.
Is this your box?
15" DUAL SEALED
If so then my two 10s are in a box about the same size.
And why don't you like ported boxes?
You must not have heard a good ported box then, because it would definitely change your mind.
Re: I set my gain with a DMM
It doesn't look like my box. My box has different terminals. You lift them and they're spring loaded. Also the sides are reccessed.
Maybe what I need are some proper car audio subwoofers? I mean these radio shack subs have a VAS rating of over 500L, doesn't that mean they need a huge enclosure? Aren't car audio subs usually around 100-200L, so they can be used in smaller boxes?
Re: I set my gain with a DMM
Can I use the DMM while the subs are hooked up? Will I damage something? Will the DMM not get a good reading?
I got some songs that play full amplitude sine waves non stop. I figure it would give a good voltage reading.
Re: I set my gain with a DMM
Quote:
Originally Posted by
Chriszle If your listening to music only, you can use -3 or even -5 db tracks to set your gain.
Heard its not to wise to do that
Re: I set my gain with a DMM
Quote:
Originally Posted by
Beatin' It doesn't look like my box. My box has different terminals. You lift them and they're spring loaded. Also the sides are reccessed.
Maybe what I need are some proper car audio subwoofers? I mean these radio shack subs have a VAS rating of over 500L, doesn't that mean they need a huge enclosure? Aren't car audio subs usually around 100-200L, so they can be used in smaller boxes?
Are you just not reading anything in this topic or what? You're running low power to some cheap subs in a sealed box. If you want those subs to shine, you need a ported box. I don't understand why you don't like ported boxes. My two 10s in their ported box would be louder than your two 15s in your sealed box on the same power. I've had sealed 15s before and then I went with a single ported 15 and it completely destroyed the sealed 15s in sound quality, loudness, and frequency response. My two ported 10s destroy the sealed 15s I had as well.
If you really want to make use of those subs, go with a ported box. You can have the box built to your musical taste and it would do so much better for you. What's the point in coming here asking for advice if you don't want to take it? Your setup the way it is isn't going to be loud, period.
You went the cheap route and got cheap results and that's all you're going to get. You can either take my advice and get a better enclosure or you can just keep what you have and continue to be disappointed. There's not much else that can be said to help you. If you want to see huge improvements, then you should just change everything you have. A good pair of ported 12s on 1k to 1.5k in a good enclosure will be a lot louder than you might think.
Quote:
Originally Posted by
ForceEdge Heard its not to wise to do that
I always do that
Re: I set my gain with a DMM
Quote:
Originally Posted by
IonRL205
I always do that
I made a thread awhile back and everyone said no just use 0db 50-60hz because -3db can blow my subs or fry my amp. I even said it seemed highly unlikely because I'm not listening to 50-60hz sine waves all day.. I listen to music.. And they still insisted in using a 0db.
Re: I set my gain with a DMM
Aside from the manufacturers suggestions how would one know if there subs should be sealed or ported
