[davidburn]

The spec's for this Sub are now unavailabe. Was wondering if there is anyway of modeling a new box without correrct Driver parameters?. I currently have this driver in a 60 lt 29hz tuned and was wanting to build a different box. Mike P kindly found this link for me for a car application.

magnat.sk/dokumentacia/XTC1200br.pdf

I found a sub that was very similar to one I have on Magnat's website.

Qts 0.31
Qes 0.33
Qms 8.00
Vas 81 L
Fs 30 Hz
Xmas 16mm
SPL 90 db
Pe 300 w

Not sure if any of this is relivant as its a different driver.

Any help would be great, Thanks in advance.

 

[Mike P.]

"Similar" can mean totally different parameters, thus different box requirements. Each sub is specific. Your options are contact Magnat and ask if the parameters are even close to the XTC-1200. Or build a box using the parameters and be prepared to be disappointed. Or sell the sub and buy a new one.

 

[davidburn]

Ill go with the latter, Sell it.
I've been eye off Mach 5 Audio IXL 12"

affordabledrivers.com.au/index.php?main_page=product_info&cPath=3_19_7&products_id=3

Should I go with the recommended box size?. Am only running 350 w plate amp.

 

[Mike P.]

The box and tuning can possibly be optimized for the amp you have, if you know if it has a rumble filter and at what frequency, If not, what is the make and model number?

 

[Mike P.]

The box and tuning can possibly be optimized for the amp you have, if you know if it has a rumble filter and at what frequency, If not, what is the make and model number?

 

[davidburn]

I found some of the spec's.
The driver is currently in a 60 lt box with Adjustable tuning 19hz to 45 hz with a 260 wrms plate amplifier with 35 hz boost and no rumble filter, the box can be reduced in size. I use it mainly for music and a little HT. Any help to make it as good as it can be. Thanks heaps for your reply.

Fs: 34Hz

Qes: 0,29

Qms: 5,4

Qts: 0,28

Vas: 70l

Re: 3 Ohm

SPL: 93 d

 

[Mike P.]

We'll have to make a few assumptions here. Assuming 12 mm Xmax, 300 watts power handling and 2 db of boost at 35 hz in the plate amp. Pink is what you have, green is 85 liters tuned to 25 hz. Without a rumble filter the sub will start bottoming out below 22 hz.

 

[davidburn]

Im just about to start the new box. I will put a rumble filter on, check out the link. http://www.edesignaudio.com/product_info.php?cPath=2_123&products_id=657
I will build the 85 lt tuned to 25 hz. I have no retraint's on size, so could you help me with an optimum box h.w.d and the correct placement for the driver and port. Will a single 108 mm port with flared end's be enough to limit chuffing?.
Thanks again.

 

[Mike P.]

You may not need the eQ2 depending on what amp you have. What is the make and model of the amp?

 

[davidburn]

its a jaycar 260 watt. Can be found on Collo's web page. Model No.??

 

[Mike P.]

I don't see a 260 watt amp.

 

[davidburn]

jaycar cat.AA-0501 240w rms into 4 ohm's
Frequency Response 20 to 160 hz
6db Bass boost @35 hz

Does that help. Is 6db boost to much, will it still work in 85lt box.

 

[davidburn]

the xmax for the driver is 15mm

 

[Mike P.]

The only way the amp will work with the sub is if it has a high pass filter at 22 hz to stop over excursion. It appears the Jaycar amp can have the HPF modified by changing 2 resistors, contact Jaycar for the information. The SPL graph is with 6 db of boost at 35hz and a HPF at 22 hz.

 

[davidburn]

Will start tommorow. Thanks very much.:T

 

[Mike P.]

If the modeling is accurate for the sub, one 4 inch port won't be enough as the air speed would be 42 m/s. It will take two 4 inch flared ports 33 inches long each to keep the air speed acceptable.

 

[davidburn]

And so it begin's. Went with 18mm mdf

H 815 mm
W 450 mm
D 360 mm

2 x 100mm port's @ 800mm long each, port's will be mounted on the bottom with 4 inch leg's.

working volume 85 lt tuned 25 hz.

 

[Mike P.]

Pics? :whistling::bigsmile:

 

[davidburn]

Will the port's on the bottom be OK? My current box is the same and seem fine. Or should i front fire them with a bend?

 

[Mike P.]

As long as you have 4 inches of clearance the port's on the bottom will be fine.