Aeroport Fire Position

[bgowdy 5,000+ posts]

experimentation is key when chasing numbers. remember to only change one variable at a time.

i know this. i was just asking opinions. i am going to re mount them and test but i have to shrink my box so i have to stuff it with something to bring size down a bit

 

[THATpurpleKUSH 5,000+ posts]

Interesting. Even for round ports you've had great luck with the corner build up like that. Hmm, perhaps I'll try it out too. Removable at first, and I'll test SPL scores while at it. It definitely helped with centered full height slot ports, but I'm excited to see what it does for round/round flared ports as well.
BTW - What are the specs on that enclosure (sticky icky) Kushy_Dreams? Also, dual 12" drivers with single 6" port?

What do you mean by corner build up? The pressure should all be focused towards the rear center and out the port.

Specs are 4 cu/ft (after all displacements are subtracted), 6inch pvc thats 14.5long on the inside which gives a tune of 31hz. 2 12 drivers.

I have ran 2 sets of woofers in that box, Boston G5 12s and Boston G1 12s

On my spl lab in my Ford Contour I pulled:

with the G5's on a Rockford Punch 1000 @ 1ohm (1400rms before rise)

142.5db sealed on the dash at 49hz (test tone)

141.18 at the headrest at 43hz (music)

135.3 at the headrest at 26hz (music)

with the G1's on a Rockford Punch 1000 @ 2 ohms (934rms before rise)

139.0 sealed on the dash on music @ 43hz

132.0 sealed on the dash on music @26hz

put the G1s in my buddy's Mazdaspeed 6 with a MTX 1501d at 2 ohms (1500rms before rise)

140.08@ the headrest at 43hz on music

132.2 @ the headrest at 26hz on music

138.xx @ the headrest on tones all the way up to 65hz

All the music scores were done with the same song, a slowed version of white girl with bass lines of 26hz and 43hz

For comparison sake, we could not pull a 140db from a pair of Diamond D6 12s wired to 2 ohms on the MTX amp and they were in a box thats roughly 1.5-1.7 cu/ft per side tuned in the upper 30s and it was a smaller box so there was much more airflow around it. We managed a best of 139.6 on music at the hreadrest with the d6's.

Thats a lot of specifics to read, but the end result is the box is super efficient, hence the $50/ea G1's getting louder than the D6's which cost 6x more.

One last tidbit of info, the box that the d6's were in was built by the same shop I referenced in my first post, it had a double baffle, 45s in the corners and the V behind 2 4inch aeros, it was not a crappy box, maybe not optimal for the d6's, but a well designed box nonetheless.

 

[THATpurpleKUSH 5,000+ posts]

??? not sure what you mean with the V. im at work so if theres a pic i cant see it right now

yep theres a pic

 

[RangerDangerV2 5,000+ posts]

i know this. i was just asking opinions. i am going to re mount them and test but i have to shrink my box so i have to stuff it with something to bring size down a bit

so if you know.. why would you bother to ask the question?

 

[Ronny 10+ year member]

Well, in that case, just go and test mang. Once you are off work or have some free time do it to it. VWGolf explained why external helps, and why it especially helps with smaller enclosures.

Kushy_Dreams did post a photo. It is in regards to placing an outside corner or V inside the enclosure where the inside port opening is. If you have a woofer/port orientation that does not support a centered port then it won't apply. But you can always rebuild //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

I see your Fo is 50Hz. Really in that case, why not just rebuild for a full-on fartbox? If you have enough height available (window line rules or not?) or just place the driver and port on the same plane whether centered above or below, or off to the side towards a corner perhaps; fire them into the corner and find what your new best burping frequency is. Also, for such a high Fo, you do not need 7.1 cubes. Why not build ~6 cubes net and leave it to where you can take up volume as well for testing, and utilize a round port so you can take away length as well.... You know, this hobby is all about intense amounts of testing.

 

[Ronny 10+ year member]

Great. Sounds good.

I call it an outside corner, you call it a V. I didn't mean anything truly being built up in one of the corners of the enclosure. I guess it's the fenestration specialist in me that HAD to call a V an outside corner instead

No kidding! Cheaper elementary woofers essentially, on such power and being able to pull that off on the SPL-Labs. Fantastic. Were all of these scores sealed up?

I'll be doing some relatively involved testing with these centered outside corners and round ports I think. I/we did some testing with the outside corners in walls with centered ports that were full height slot ports, I'll have to post them with the entire thread that I'll make. I better hurry though, seeing as how school is just around the corner //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

Thanks! //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

What do you mean by corner build up? The pressure should all be focused towards the rear center and out the port.
Specs are 4 cu/ft (after all displacements are subtracted), 6inch pvc thats 14.5long on the inside which gives a tune of 31hz. 2 12 drivers.

I have ran 2 sets of woofers in that box, Boston G5 12s and Boston G1 12s

On my spl lab in my Ford Contour I pulled:

with the G5's on a Rockford Punch 1000 @ 1ohm (1400rms before rise)

142.5db sealed on the dash at 49hz (test tone)

141.18 at the headrest at 43hz (music)

135.3 at the headrest at 26hz (music)

with the G1's on a Rockford Punch 1000 @ ohms (934rms before rise)

139.0 sealed on the dash on music @ 43hz

132.0 sealed on the dash on music @26hz

put the G1s in my buddy's Mazdaspeed 6 with a MTX 1501d at 2 ohms (1500rms before rise)

140.08@ the headrest at 43hz on music

132.2 @ the headrest at 26hz on music

138.xx @ the headrest on tones all the way up to 65hz

All the music scores were done with the same song, a slowed version of white girl with bass lines of 26hz and 43hz

For comparison sake, we could not pull a 140db from a pair of Diamond D6 12s wired to 2 ohms on the MTX amp and they were in a box thats roughly 1.5-1.7 cu/ft per side tuned in the upper 30s and it was a smaller box so there was much more airflow around it. We managed a best of 139.6 on music at the hreadrest with the d6's.

Thats a lot of specifics to read, but the end result is the box is super efficient, hence the $50/ea G1's getting louder than the D6's which cost 6x more.

 

[bgowdy 5,000+ posts]

so if you know.. why would you bother to ask the question?

nevermind dude. i was saying i know the test test test stuff. IM AT WORK, so i cant test. I was simply asking for input. in other words peoples exp with external vs internal.

 

[bgowdy 5,000+ posts]

Well, in that case, just go and test mang. Once you are off work or have some free time do it to it. VWGolf explained why external helps, and why it especially helps with smaller enclosures.
Kushy_Dreams did post a photo. It is in regards to placing an outside corner or V inside the enclosure where the inside port opening is. If you have a woofer/port orientation that does not support a centered port then it won't apply. But you can always rebuild //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

I see your Fo is 50Hz. Really in that case, why not just rebuild for a full-on fartbox? If you have enough height available (window line rules or not?) or just place the driver and port on the same plane whether centered above or below, or off to the side towards a corner perhaps; fire them into the corner and find what your new best burping frequency is. Also, for such a high Fo, you do not need 7.1 cubes. Why not build ~6 cubes net and leave it to where you can take up volume as well for testing, and utilize a round port so you can take away length as well.... You know, this hobby is all about intense amounts of testing.

i dont burp i compete on music average.... the box after all dis place is prolby around 6.7 or .8 cubes honestly, its been tested my score decreased when i went under 6.7. AQ like larger box.

 

[THATpurpleKUSH 5,000+ posts]

Great. Sounds good.I call it an outside corner, you call it a V. I didn't mean anything truly being built up in one of the corners of the enclosure. I guess it's the fenestration specialist in me that HAD to call a V an outside corner instead

No kidding! Cheaper elementary woofers essentially, on such power and being able to pull that off on the SPL-Labs. Fantastic. Were all of these scores sealed up?

I'll be doing some relatively involved testing with these centered outside corners and round ports I think. I/we did some testing with the outside corners in walls with centered ports that were full height slot ports, I'll have to post them with the entire thread that I'll make. I better hurry though, seeing as how school is just around the corner //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

Thanks! //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

some scores were sealed, some were at the headrest like where MECA meters at. I listed where the meter was for each score that was posted.

 

[Ronny 10+ year member]

i dont burp i compete on music average.... the box after all dis place is prolby around 6.7 or .8 cubes honestly, its been tested my score decreased when i went under 6.7. AQ like larger box.

You compete on music with a 50Hz Fo? If that is your daily enclosure then you might as well build a burp box for 50Hz but play some music that will keep you right there in the lanes.

Shrink her way down, tons of port, and try to utilize coupling the best you can with corner loading/firing the port(s) or woofer. I have quite a bit of experience with AQ... Err, SQ, lol. And I was able to produce fantastic numbers with burping them in smaller enclosures and lots of port. That is just a start of course, I'm pretty sure most will state that you want to start with lower volume in the enclosure, and lots of port.

Although many, including myself, have seen the opposite work very well, it certainly is all specific to each and every build.

 

[bgowdy 5,000+ posts]

You compete on music with a 50Hz Fo? If that is your daily enclosure then you might as well build a burp box for 50Hz but play some music that will keep you right there in the lanes.Shrink her way down, tons of port, and try to utilize coupling the best you can with corner loading/firing the port(s) or woofer. I have quite a bit of experience with AQ... Err, SQ, lol. And I was able to produce fantastic numbers with burping them in smaller enclosures and lots of port. That is just a start of course, I'm pretty sure most will state that you want to start with lower volume in the enclosure, and lots of port.

Although many, including myself, have seen the opposite work very well, it certainly is all specific to each and every build.

its 50 hz because my trucks res freq is around there. it peaks at 50 but plays pretty well all the way down to about 35hz, i dont listen to anything really below that anyway.

 

[bgowdy 5,000+ posts]

You compete on music with a 50Hz Fo? If that is your daily enclosure then you might as well build a burp box for 50Hz but play some music that will keep you right there in the lanes.Shrink her way down, tons of port, and try to utilize coupling the best you can with corner loading/firing the port(s) or woofer. I have quite a bit of experience with AQ... Err, SQ, lol. And I was able to produce fantastic numbers with burping them in smaller enclosures and lots of port. That is just a start of course, I'm pretty sure most will state that you want to start with lower volume in the enclosure, and lots of port.

Although many, including myself, have seen the opposite work very well, it certainly is all specific to each and every build.

also the way it is right now its pretty musical for my taste. so i dont want a burp box

 

[RangerDangerV2 5,000+ posts]

also the way it is right now its pretty musical for my taste. so i dont want a burp box

tuned to 50hz is a music box??

 

[bgowdy 5,000+ posts]

tuned to 50hz is a music box??

thats just the way it came out. im content with it. i dont listen to nothing below 35hz and it plays down to that pretty well

 

[RangerDangerV2 5,000+ posts]

thats just the way it came out. im content with it. i dont listen to nothing below 35hz and it plays down to that pretty well

so let me get this straight... you design a box add some ports and just run it how it comes out? that will almost always end in failure...