Can you just eye ball 4th orders?

[Jake321]

Can you just eye ball 4th orders?

Seems like allot of YouTube videos eyeball ratios and frequencies that work.

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[winkychevelle 10+ year member]

Can you just eye ball 4th orders?

Seems like allot of YouTube videos eyeball ratios and frequencies that work.

Why eyeball it? Box programs are everywhere. Ratios are typically 1:1 to 3:1 just play around with the box specs in the program until you find the box response curve that you want.

If you are good you will know your vehicles cabin gain and factor that into the box design

 

[Buck 5,000+ posts]

I wouldn’t eyeball it. The wrong specs for a 4th BP can really make them sound poorly, and you really have to make sure you have the right subs for the sealed section that’ll play like you want. 4th BP’s have a lot of misconceptions, at least I’ve seen a lot of misconceptions relative to chamber sizes and ratios. The worst way to do it, IMO, is when I see people do a tiny sealed chamber and a huge ported chamber; that’s really more of an SPL style 4th, can be very peaky, not play low, fall off severely away from tuning/peak. Every sub and system situation varies, so if you really want the best sound, it’s best to incorporate all of your system’s specific factors into the design, and make sure a 4th BP is going to meet your goals. The most important part for musical response is making sure the sub plays well in the sealed section, as that is the primary chamber for the entire 4th BP.

It’s also important to know exactly what your specs are to learn what those specs sound like this time, so you can know how you can modify those relative specs in the future for new builds.

 

[Bobbytwonames 5,000+ posts]

Why eyeball it? Box programs are everywhere. Ratios are typically 1:1 to 3:1 just play around with the box specs in the program until you find the box response curve that you want.

If you are good you will know your vehicles cabin gain and factor that into the box design

I have cabin loss.

 

[audiobaun 5,000+ posts]

Why would anyone EyeBall any enclosure?? LOL. Best on that one

 

[audiobaun 5,000+ posts]

Can you just eye ball 4th orders?

Seems like allot of YouTube videos eyeball ratios and frequencies that work.

I wouldnt be watching those type of Vids any more and get some really retarded advice from them. There are quite a few AssHatts on You Tube these days trying to make a BUCK on Click Bait

 

[hispls 5,000+ posts]

I have cabin loss.

Try pulling your box out of your truck out in the middle of the desert and doing an SPL reading from 1 meter away and report back.

 

[Jimi77 Premium Member]

I wouldn’t eyeball it. The wrong specs for a 4th BP can really make them sound poorly, and you really have to make sure you have the right subs for the sealed section that’ll play like you want. 4th BP’s have a lot of misconceptions, at least I’ve seen a lot of misconceptions relative to chamber sizes and ratios. The worst way to do it, IMO, is when I see people do a tiny sealed chamber and a huge ported chamber; that’s really more of an SPL style 4th, can be very peaky, not play low, fall off severely away from tuning/peak. Every sub and system situation varies, so if you really want the best sound, it’s best to incorporate all of your system’s specific factors into the design, and make sure a 4th BP is going to meet your goals. The most important part for musical response is making sure the sub plays well in the sealed section, as that is the primary chamber for the entire 4th BP.

It’s also important to know exactly what your specs are to learn what those specs sound like this time, so you can know how you can modify those relative specs in the future for new builds.

Agreed. Sealed you can away with eyeballing. Ported - maybe a little bit of eyeballing. 4th order BP can sound really bad if not done right.

 

[Deiimos]

I remember as a young teen late 90’s, I tried to build a bandpass, don’t remember what sub, but cheap 10 or 12. This was true eyeballing aiming for the kind of bandpass’s I would see in Best Buy, flea market, etc. No computer, no books on it, no modeling software, just, I should be able to make that!

Let’s just say if you set it in the middle of a quiet library, no one would even notice a sub playing full tilt, it had very little output.

I at least learned BP boxes were not as simple as I thought.

 

[Jimi77 Premium Member]

I remember as a young teen late 90’s, I tried to build a bandpass, don’t remember what sub, but cheap 10 or 12. This was true eyeballing aiming for the kind of bandpass’s I would see in Best Buy, flea market, etc. No computer, no books on it, no modeling software, just, I should be able to make that!

Let’s just say if you set it in the middle of a quiet library, no one would even notice a sub playing full tilt, it had very little output.

I at least learned BP boxes were not as simple as I thought.

I've seen the opposite - loud as f@#k but total one note wonders.

 

[Bobbytwonames 5,000+ posts]

Try pulling your box out of your truck out in the middle of the desert and doing an SPL reading from 1 meter away and report back.

Is cabin loss bad? I'm tuned to 33 hz. or 34 hz. and peak at 31 hz. is that a bad thing?

 

[Jimi77 Premium Member]

Is cabin loss bad? I'm tuned to 33 hz. or 34 hz. and peak at 31 hz. is that a bad thing?

It's cabin gain. Generally the box (outside of the vehicle) will peak prior to the tuning frequency.

 

[Bobbytwonames 5,000+ posts]

It's cabin gain. Generally the box (outside of the vehicle) will peak prior to the tuning frequency.

So outside of the vehicle my box will peak lower than 33 hz. if I'm tuned to 33 hz.?

 

[winkychevelle 10+ year member]

So outside of the vehicle my box will peak lower than 33 hz. if I'm tuned to 33 hz.?

I still don't know how you think you have cabin loss. You say you peak at 31 but are tuned at 33. Your cabin gain is around 31hz.

More likely you cabin gain overlaps the sub box at 31hz causing the peak there.

 

[Bobbytwonames 5,000+ posts]

I still don't know how you think you have cabin loss. You say you peak at 31 but are tuned at 33. Your cabin gain is around 31hz.

More likely you cabin gain overlaps the sub box at 31hz causing the peak there.

I must be confused what cabin gain is. Back to school for me. Where would my box peak outside of my truck?