Q12 12" Sub

Nowadays I get much more pleasure taking small systems to venue's and watching reactions when the "toys" perform perfectly adequately for the job.

I have built this little jobby just to test the alignment that I will use in a twin version.

I have  been a bit aggressive with the tuning and have gone for a couple of db lift  at the bottom end instead of the flat response that I normally go for.

It is still -3db at 42 hz and -6 at 38 hz not bad for a 12" in a 40l box. efficiency is on the low side though and I should get a max'm output of about 119db continuous. I am hoping output for the twin model will be close to the theoretical 125db which should be ample for most pubs/small clubs.









Tony









Edited by Tony Wilkes - 18 March 2012 at 12:49pm

That looks really good, how did u model the port being close to the driver? did you just add an estimated length to the port??

Port is on the back mainly to allow me to check Magnet temps, also has the benefits of smaller baffle, less port noise and it has to help cooling.

Tony

Sheggy wrote: Very nice build. What driver will you put in there?

BMS 12N630

Also see  http://www.freespeakerplans.com/index.php?option=com_jfusion&Itemid=64&jfile=viewtopic.php&f=26&t=751

Tony

Meat wrote: Lovely build there Tony. How much gas do you have to give it to get the 119dB?

Its a 600w driver. I have tested it on one of Andy's xp5000's so getting about 1200w with the clip light flickering and the little bugger still seems quite happy, high-passed at 38hz.

No problems with Xmax due to the choice of port frequency & dia. etc.

Due to have some much more meatier tests soon when I check temp. rise. I mentioned dub to it and it went and hid in the corner 

Tony

stevie wrote: Looks very nice, Tony, as usual. What are your thoughts on the rubber surround? I'd be worried that it's too floppy.  Also, what's the UK price on those - I can't find it anywhere. My main problem with cabs that size is port noise. I'm very interested to see how you get on.

Stevie  The rubber surround is unlike what you are probably thinking and is actually quite stiff.

When I first saw one of these drivers I tried pushing the cone , as you do, and was amazed at how much resistance there was. Not at all like your typical Hi-Fi driver rubber roll surround.

There is no problem at all with port noise, when used with a mid-top my ears are ringing well before I can hear any chuffing.

Tony


Edited by Tony Wilkes - 09 July 2009 at 7:14pm