Sundown U 15 facing up or forward?

[shredder2]

I'll pass on that. I originally specified the U series because they are on sale @pre order prices. I might go with a pair of u 12 D4's.
One thing I don't understand is port sizes. When I received my X10 box, I assumed I would have a 2x12 port (random number for visual idea) and instead I had a 2x2. I asked around and was told the port sounds about right for the box, tune blah blah.

Are the large ports just visual or does it actually benefit the listener?

Is there a preferred port type for low and loud?

You're kidding right?.. a 2x2 port for an X-10?

 

[garychoffmann 10+ year member]

Sundown rec's 24" of port. So a 2x12 port would have been correct.

 

[West1 10+ year member]

I'll take a pic and measure. CR@P, just realized the site says 2x24 for port. Even though its a small @ss port, if it was tuned correctly, would it sound the same as a tuned box with a 2x24 port?

I know its hard to search things, at least for myself. If the search engine worked properly on this forum, it would cut away at questions I have or answered needed. To search on Google, you must write a paragraph to narrow down an answer.

 

[THATpurpleKUSH 5,000+ posts]

I'll pass on that. I originally specified the U series because they are on sale @pre order prices. I might go with a pair of u 12 D4's.
One thing I don't understand is port sizes. When I received my X10 box, I assumed I would have a 2x12 port (random number for visual idea) and instead I had a 2x2. I asked around and was told the port sounds about right for the box, tune blah blah.

Are the large ports just visual or does it actually benefit the listener?

Is there a preferred port type for low and loud?

You mean a 2inch by 2 inch square port? If that's the case that is entirely wrong and the box should be rebuilt. You should have 7-11 square inches of port area per cubic foot of volume for a round port, or 16-18 square inches per cubic foot if it's a slot port.

Edit: sundown recommends 24sq inches not 2x24. 24sq in / 1.5cf = 16 sq inches per cubic foot.

 

[West1 10+ year member]

Just ran outside to measure real fast, its 3"x4" (the 2x2 was a guess, my fault).

View attachment 26557279

 

[THATpurpleKUSH 5,000+ posts]

Just ran outside to measure real fast, its 3"x4" (the 2x2 was a guess, my fault).View attachment 26557279

There's your problem then. That box needs to be redesigned..... by someone who knows what they are doing. Who knows what its actually tuned to or what the volume actually is if they couldn't even get the port right.

 

[Jeffdachef 5,000+ posts]

Just ran outside to measure real fast, its 3"x4" (the 2x2 was a guess, my fault).View attachment 26557279

Waaaaay too little port area. You must have a lot less room than originally expected it he has to do such a small port to tune that low. Your rear air velocity nunbers are way past compression levels. X10s are high displacement subs hence they need a bit more port

 

[shredder2]

Something like this... it's 17.29 per and 1.57ft3 net... that's a correct box/port for an X-10.

 

[West1 10+ year member]

There's your problem then. That box needs to be redesigned..... by someone who knows what they are doing. Who knows what its actually tuned to or what the volume actually is if they couldn't even get the port right.

Wow lol.

Something like this... it's 17.29 per and 1.57ft3 net... that's a correct box/port for an X-10.

Sorry, I don't understand this.

The numbers you gave me are a correct box port or the port I have is correct or close too?

edit (just realized picture did not show so its a reference towards port for x10)

Waaaaay too little port area. You must have a lot less room than originally expected it he has to do such a small port to tune that low. Your rear air velocity nunbers are way past compression levels. X10s are high displacement subs hence they need a bit more port

Doubt that is the issue, box is like 48-52" long. I had plenty of space when giving dimensions to builder.

Well I guess it's time to find another SoCal box builder.

I am really considering a pair of U-12" right now that they are under 400 a piece. Then upgrade to a Scv 3k (or similar too).

you've all been very helpful! I appreciate it.

 

[shredder2]

Basically dude... your box is an abomination that chokes all output. That X can't breathe... lol

 

[West1 10+ year member]

Basically dude... your box is an abomination that chokes all output. That X can't breathe... lol

The $225.00 cost of learning. On a positive note, I am excited to hear a well tuned box and what sub(s) I will upgrade too:suave:

 

[THATpurpleKUSH 5,000+ posts]

The $225.00 cost of learning. On a positive note, I am excited to hear a well tuned box and what sub(s) I will upgrade too:suave:

Whoever built your box has no business building boxes, I would ask for your money back and give them the box back. You can save a lot of money building a box yourself. The hardest part is the design, assembly is easy. All you need is a jigsaw and a drill.

 

[shredder2]

I believe I did purchase a proper box. I've seen a lot of nice builds on FB from the builder Acoustical Design Inc.

That box needs to be redesigned..... by someone who knows what they are doing. Who knows what its actually tuned to or what the volume actually is if they couldn't even get the port right.

Waaaaay too little port area. Your rear air velocity nunbers are way past compression levels. X10s are high displacement subs hence they need a bit more port,BTW, you got your box from John the butcher? LOL. The his boxes performs but a lot of his work is shoddy in other installs.

The $225.00 cost of learning.//content.invisioncic.com/y282845/emoticons/suave.gif.858fc102f7646e678ee8af7e1fbc41d1.gif

Whoever built your box has no business building boxes, I would ask for your money back and give them the box back. You can save a lot of money building a box yourself. The hardest part is the design, assembly is easy. All you need is a jigsaw and a drill.

That's one screwed up deal you got man... $225 and it underperforms. Sundown has a killer rep for a reason... 1 X-10 should get down and get pretty loud for a 10" sub, as long as it's got power it'll impress.

Wow

 

[West1 10+ year member]

I will ask for a refund, not sure if I will get it as its been about 4 months since I picked it up. A redo would be fine but I can't get upset for buying something I didn't not understand in the first place.
@THATpurpleKUSH I've actually thought about making my own but a diy glass box since my floor is weird af and I would like to use as much of it as possible. Doesn't look to hard, I just can't get the box size or port length down. I wouldn't even care about sanding it since its in my "get to work car" :laugh:

Any good sources on DIY glass enclosures?

 

[shredder2]

@THATpurpleKUSH I've actually thought about making my own but a diy glass box since my floor is weird af and I would like to use as much of it as possible. Doesn't look to hard, I just can't get the box size or port length down. I wouldn't even care about sanding it since its in my "get to work car" :laugh:[/QUOTE]

Got a pic of the box in question in car?.. I'd like to see it.