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  #1  
Old 10-22-2002, 04:59 AM
Mopard Mopard is offline
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Question Cerwin Vega ???

I have 2 Cerwin Vega XL-series 12" subs in a ported box. I do not like the bass they put out. I have heard good things about this brand. Would I get more bass if I put some polly fill in the box or would it make it sound worse?
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  #2  
Old 10-22-2002, 08:22 AM
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DavidRo DavidRo is offline
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Biggrin

Cerwin Vega - if done correctly - will blow you ear drums out (literally). There are a couple factors that could be hindering your system. One - did you build your own box or buy a pre-fab kind. Either way, if you have too much or not enough room for the subs then you will lose sound quality. Always follow the manufacturers instructiions on the mounting depth and cubic dimensions. Also - I'm not sure about a ported box with Vega - check to see what type of enclosure they recommend for the XL subs. Second - if you don't have enough or then again have too much bass going to them, then you will not get the potential bass that you want. There again make sure you follow the recommended watts to each sub. I doubt that filling the box with foam will make a difference that much. Bottom line is - I don't think the subs are the problem. I have hooked up several systems with Vega's and they rock if done correctly. I hope this helps - Good Luck!!
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  #3  
Old 10-22-2002, 11:04 PM
Mopard Mopard is offline
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The sound of the bass is not good at all. The box was supposed to be professionally made but I am not sure it was done to specks. He might have cut some corners,(so to speak) when making it. I am not for sure though. I can't find anyone, that has an audio shop, who is willing to check it out. I think the dimensions are supposed to be 2.2 cubic feet per sub and they are supposed to be ported box. I think the box is supposed to be filled with foam. It has been so long and these subs have been discontinued for some time now. No one with in a 100 mile radis wants to check the box to see if it is made right.
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  #4  
Old 10-23-2002, 03:59 AM
volare360 volare360 is offline
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when I was looking at subs I had a shop put 2 different ones in my car
a pair of 12" CV in ported box
and a pair of 12" Kicker compVR sealed

the CVs were just too much
I could see the back of the roof flexing
I chose the kickers-they were saner

do you have a subsonic filter on it-what about a low pass filter
ported boxes only like a narrow range of sound
I would agree that the box could be incorrect
port size,shape and length would make it crappy sounding,also could hurt the subs
check out CVs website-is there someway to get your specs
I had an old Kenwood amp I know nothing about-emailed kenwood and they emailed me a copy of the owners manual-for free
get the specs on the subs first
measure your box externally and subtract the material size
HxWxD=internal volume
measure the port diameter and length

most places dont want to do the work on finding the sub specs
they want you to buy new
manufacturers want to make a costumer-if you like what you have,when you upgrade you may chose them again

BTW-polyfill may help,it may not
no way to tell unless you try it
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Old 10-23-2002, 04:10 AM
Mopard Mopard is offline
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I figured that kickers would blow the CV away. I have only low pass signal going to them with a built in Bass Boost. What is a subsonic filter?
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  #6  
Old 10-27-2002, 01:45 AM
desktopsilver desktopsilver is offline
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Default cerwin

cerwin vega just got baught out info here http://www.prosoundweb.com/news/biz/0902/st.php : same people who make stanton turntables I guess.
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  #7  
Old 10-29-2002, 06:19 AM
volare360 volare360 is offline
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the kickers were sealed while the CVs were ported
if I was for all out bass I would have gotten the CVs
but I opted to get the HIT

lowpass makes sure your subs receive a low signal correct
subsonic cuts out the signal below the tuning frequency
a ported box has a limited frequency it can use
above and below that-it creats heat,distortion,and resonence
ported boxes usually dont get one-it is nice to have tho

I personally have an audio control 2XS crossover-high and low pass-I am running sealed
90-33 htz is the low filter frequency
it gives the subs that signal and that signal only
below 33 you cant hear-and it just wastes power and creates heat-blah blah blah
it is the preset filter-it is changable for fine tuning and customizing
with or without it isnt much of a difference
the amp has lowpass-but it cant hurt.I picked it up for a nice price
I split the one signal to rear speakers and subs


what exactly dont you like about the bass?
I personally would start with measuring the box and port
find out what it is tuned for
you might be sending it too high or too low of a signal and getting resonation
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  #8  
Old 10-30-2002, 02:22 AM
Mopard Mopard is offline
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Sometimes the bass sounds as if it is comeing from two 6x9s instead of two 12". The port will be easy to measure but the box is a problem because it is not exactly the same on all the sides. I have a 6db bass boost on my amp and if I turn that off it sounds even worse.
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  #9  
Old 10-30-2002, 05:05 AM
volare360 volare360 is offline
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first go through your whole system and make sure it is set up correctly-all the crossovers ect
just last month I added another amp to my system-for the front speakers
the bass just dropped
went through the set up and I had the crossover for my subs on high pass-I set them to low and now my bass
if everything checks out
disconnect all other RCAs and just leave the subs
see how it sounds right at the box-if it sounds crappy then you will need to get into your box set up

3 years ago I picked up a pair of 12" clarion subs and a ported box
the guy I got them from cut the ports to make a box for the subs in his s10-lost interest in stereo(a wife will do that)
all together it sounded crappy-no boom,no bass,just wind
the ports were way too short
I heard the box B4 he got them-the guy was running them and a pair of MTX 10"-sealed
it pounded so hard it shook the sideing at work
I bought the 10s and box-the other guy got the 12s
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  #10  
Old 10-30-2002, 05:14 AM
Mopard Mopard is offline
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Thanks for the additional info. I will check that out tomorrow. I did not know that a port size would make that big of difference. I will get in touch with Vega tomorrow to see if they have the info on the subs.
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  #11  
Old 10-31-2002, 04:43 AM
volare360 volare360 is offline
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port size is THE most important thing with a ported box
size and length
they have to be tuned for the subs output

let us know what you come up with
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  #12  
Old 11-01-2002, 03:47 AM
Mopard Mopard is offline
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This is the information that Vega sent me. They also sent it very quick, like the next day.:


XL - 12S

Fs 33hz
Qes 0.261
Qms 4.5
Qts 0.247
Vas 4.9 cu ft
Xmax 0.314"
POWER HANDLING 250 Wrms

Recommended tuning 35 Hz

The recommended enclosure per driver is 2.2 cu ft with a 4" diameter port 10.75" long.



Most of this I do not understand.
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  #13  
Old 11-01-2002, 05:46 AM
Mopard Mopard is offline
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Well, I measured the ports,........ and instead of 4" diameter port 10.75" long they were 3 3/4" diameter and 13" long. The first 3" or so of the port is plastic and the remaining leanth is a hard card board. I am not sure of the box size. I do know that the box is not equal on all four sides. It is sort of slanted. The ports may be made directly for that box but not according to the box that the Vega subs are supposed to be mounted in.
I don't want to cut the port to see if it has a better effect on the sound but I would like to put the correct size port in there to see if I can hear or feel the difference.
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Old 11-01-2002, 05:52 AM
Mopard Mopard is offline
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I forgot to mention. You said:
Quote:
they have to be tuned for the subs output
. Did you mean that the ports have to be made the way Vega states for that particular sub?

I also went through the whole system and made sure it was set up correctly-all the crossovers ect, everything. It is all correct. I even turned up the amp a small tad.
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  #15  
Old 11-01-2002, 07:16 PM
volare360 volare360 is offline
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the ports dont have to be made the way they want-it is best but box size and design make getting an exact match hard
as long as the port volume is correct it should be alright

what do other ppl say about the bass
maybe you would prefer another style of box
sealed/ported/bandpass all have different sounds
all have different pros and cons

JLaudio have a tutorial that is just awesome,I would suggest you check it out,they have great info
myth of the magic box and port are the 2 that relate to you

see about talking to a person who builds boxes
find out where stereo shops get their custom boxes,and find out if you could talk to him personally
remember school-math-volume of off size cubes----you knew sleeping in class would come back to haunt you
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  #16  
Old 11-02-2002, 03:25 AM
Mopard Mopard is offline
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Exclamation

Other people say the same thing I do. I want the HARD HITTING BASS, that when it hits you can feel it in your rib cage in the front seat as well as the back seat.1
1
Quote:
remember school-math-volume of off size cubes----you knew sleeping in class would come back to haunt you
Were you the one sitting behind me back then????lol
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  #17  
Old 11-03-2002, 04:47 PM
volare360 volare360 is offline
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accually I was always good in math-doesnt mean I was always awake but

have you checked out other systems-with other setups
I myself prefer sealed-not that it is perfect for everyone but for comparson
I know one guy that had a pair of sealed 10" and a pair of ported 12" in his car
that had so much we could feel/hear it in the lunchroom at work-through a few brick walls and all
I think he said he was hitting in the 140s dbs

different music will like different bass as well
I listen to just about everything so I had to compromise-I would like to port the 12" kickers and add a pair of 8" sealed in the front doors--to bring the bass in front and give it the boom
of course I will need a real EQ/crossover--thinking about audiocontrol EQS,6XS,4XS or something
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