50+ Hz sounds like ***

[Ray21 10+ year member]

I really love those old **** cones subs...

 

[hatedonmostly 5,000+ posts]

Try placing something in line with your port that extends further out than the port itself does, just as an experiment. It may lower your tuning slightly, but it may stop your subs from being overloaded, or move the frequency that it occurs out of your needed bandwidth.

I was thinking about this as well (even going the entire length of the box) to cut down on cancellation.

Consider this too. The hole in the cab for the blowthrough is about half the size of the opening in the box for the clamshell. Could that affect things?

 

[T3mpest 10+ year member]

possibly. Can you move the box forward or backwards in the cab? If so bring it closer or further way from the opening and see if that helps.

 

[hatedonmostly 5,000+ posts]

When it was further away, it sounded bad (even with two subs, which always sounded good, on all frequencies) so it's as close as it can be right now.

I haven't done any troubleshooting yet, but I will Tuesday.

The deciding factor I think is going to be that inner port wall, and I might want to seal it up against the cab like so...

But then again, I don't want to lose any more area that's venting into the cab, since the hole is already half the size of the box opening.

 

[s1ctech 10+ year member]

I personally think its a catch 22. You either want lows or decent high tones. Hardly can you ever get completely both and be satified. I have the top of the line of the RE audio and its a monsterst beast, but because of my low tuning very very fast double bass can feel boomy. and a lot of double bass is tuned higher the faster it gets in metal. The sub is still very responsive to it, but I notice that high sub gain volume. Like say? 3/4 tilt I do notice it gets boomy (mostly due to a huge box with low tuning obv) idk maybe its not hitting every double bass point, but it also could be down to how the CD was mastered as well with how much bass guitar they got going on the track that can cause the boomyness. I have a lot of post hardcore double bass plays perfect and extremely chest pounding.

Also what music are you playing? What parts of music do you notice thats @ 50hz?

I would almost tell you to check out higher tunings?. To be honest I would contact Spy and see what he recommends. I am sure its not the setup of you're settings or subs but more the box or port area. OR how the box is designed in general.

Are these the REAudios RE'xs? if so those only do 175wrms man and they are the lowest line of RE subs. Not to say they are not good but I mean things have limitations in that price range. and I just I don't know what you are expecting out of them. They will probably be better in a sealed box. but that won't work so well with a blownthru truck I guess. lol

This is cool try this!

http://carphotos.cardomain.com/ride_images/1/1466/4481/3664740100_large.jpg

 

[audioholic 5,000+ posts]

I dont think this is your freq problem, but you mentioned the subs looking like they were playing out of phase sometimes. Your port mouth (inside the enclosures) is not symmetrical about the subs, is it? Im amazed how many people dont think about this when designing enclosures. The sub mounted closer to the port will unload faster due to less resistance on cone motion, and this difference in resistance between the subs creates the uneven excursion you mentioned seeing. This also creates a situation in which each sub perceives a different interior enclosure volume, thus altering tuning between the two subs in the shared chamber, making over all freq response erratic.

I agree I think a baffle board between the two enclosures would be a good first step in troubleshooting this issue.

 

[hatedonmostly 5,000+ posts]

I personally think its a catch 22. You either want lows or decent high tones. Hardly can you ever get completely both and be satified. I have the top of the line of the RE audio and its a monsterst beast, but because of my low tuning very very fast double bass can feel boomy. and a lot of double bass is tuned higher the faster it gets in metal. The sub is still very responsive to it, but I notice that high sub gain volume. Like say? 3/4 tilt I do notice it gets boomy (mostly due to a huge box with low tuning obv) idk maybe its not hitting every double bass point, but it also could be down to how the CD was mastered as well with how much bass guitar they got going on the track that can cause the boomyness. I have a lot of post hardcore double bass plays perfect and extremely chest pounding.
Also what music are you playing? What parts of music do you notice thats @ 50hz?

I would almost tell you to check out higher tunings?. To be honest I would contact Spy and see what he recommends. I am sure its not the setup of you're settings or subs but more the box or port area. OR how the box is designed in general.

Are these the REAudios RE'xs? if so those only do 175wrms man and they are the lowest line of RE subs. Not to say they are not good but I mean things have limitations in that price range. and I just I don't know what you are expecting out of them. They will probably be better in a sealed box. but that won't work so well with a blownthru truck I guess. lol

This is cool try this!

http://carphotos.cardomain.com/ride_images/1/1466/4481/3664740100_large.jpg

I mostly noticed it on rock, but I solved the problem.

The RE's are the older style, FWIW. Supposedly have a better build quality than the new RE Audio stuff, although these lower end RE subs are all made in China anyway. I'm happy with them now, they play **** low, but because they don't require such big boxes (1.5 for each in my box) they also are really punch and not boomy (as long as you set your amp correctly, unlike how mine has been for months now //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif)!

I dont think this is your freq problem, but you mentioned the subs looking like they were playing out of phase sometimes. Your port mouth (inside the enclosures) is not symmetrical about the subs, is it? Im amazed how many people dont think about this when designing enclosures. The sub mounted closer to the port will unload faster due to less resistance on cone motion, and this difference in resistance between the subs creates the uneven excursion you mentioned seeing. This also creates a situation in which each sub perceives a different interior enclosure volume, thus altering tuning between the two subs in the shared chamber, making over all freq response erratic.
I agree I think a baffle board between the two enclosures would be a good first step in troubleshooting this issue.

Wow really? I had no idea. But wouldn't that be the case with all ported boxes out there where the port is on only one side?

I did the extended port wall about a week back and it did indeed clean up how the bass sounded. But what really made an impact was when I went over all my setting on the amp again. Apparently I didn't know what I was doing when I set the amp, I had the LPF too low and when I raised that to around 100, it really cleaned up the sound. I guess I set the LPF really low to counteract how it sounded weird around 60 Hz. Still doesn't sound great that high, but I don't listen to much music at that frequency. But bass is a lot more punchy now, not as boomy, and rock sounds great.

 

[audioholic 5,000+ posts]

Wow really? I had no idea. But wouldn't that be the case with all ported boxes out there where the port is on only one side?

Yes, really. And yes, it happens on all non-symmetrical enclosures/ports where multiple subs share a chamber.

I did the extended port wall about a week back and it did indeed clean up how the bass sounded. But what really made an impact was when I went over all my setting on the amp again. Apparently I didn't know what I was doing when I set the amp, I had the LPF too low and when I raised that to around 100, it really cleaned up the sound. I guess I set the LPF really low to counteract how it sounded weird around 60 Hz. Still doesn't sound great that high, but I don't listen to much music at that frequency. But bass is a lot more punchy now, not as boomy, and rock sounds great.

If it makes you feel any better, ideally anything above 60hz should come from your front stage anyway. Time to start thinking about beefing up your midbass (and yes, tweeter, I remember your tweeter thread too). Dont worry, you are making a natural progression in car audio.

 

[silvercookie 5,000+ posts]

sounds like some major cancelation going on.

 

[keep_hope_alive Premium Member]

I dont think this is your freq problem, but you mentioned the subs looking like they were playing out of phase sometimes. Your port mouth (inside the enclosures) is not symmetrical about the subs, is it? Im amazed how many people dont think about this when designing enclosures. The sub mounted closer to the port will unload faster due to less resistance on cone motion, and this difference in resistance between the subs creates the uneven excursion you mentioned seeing. This also creates a situation in which each sub perceives a different interior enclosure volume, thus altering tuning between the two subs in the shared chamber, making over all freq response erratic.
I agree I think a baffle board between the two enclosures would be a good first step in troubleshooting this issue.

genius

 

[hatedonmostly 5,000+ posts]

Yes, really. And yes, it happens on all non-symmetrical enclosures/ports where multiple subs share a chamber.


If it makes you feel any better, ideally anything above 60hz should come from your front stage anyway. Time to start thinking about beefing up your midbass (and yes, tweeter, I remember your tweeter thread too). Dont worry, you are making a natural progression in car audio.

I know. The whole issue there is that since my front stage amp is lacking a built in crossover; I have it crossed to one of the two of the built in settings on the head unit. Oh well, that will be my next upgrade.

I'm just glad I can put the sub stage aside and work on other things, because I am finally happy with it. Loud and sound quality. I love it.

 

[Canaan 10+ year member]

Well, one thing that stands out to me is THAT IS NOT A PORTED BOX!

With the front chamber there, you have a series tuned 6th order.

 

[hatedonmostly 5,000+ posts]

Well, true.

How do you tune a 6th order? //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

 

[keep_hope_alive Premium Member]

you tune it with port length and volume

 

[hatedonmostly 5,000+ posts]

you tune it with port length and volume