Originally Posted by Bandyka
So last night I was able to finish the build and do the first round of setup. Applied a 17hz high pass in miniDSP, did a little EQ-ing, created a house curve and used ARC genesis to top it all off. The result is not bad at first go. As mentioned I went in with low expectations and it definitely surpassed them by a nice margin. Down low it definitely hits harder than the ML did, for music its not as precise but close, I occasionally hear some port noise which requires more testing to isolate but its no deal breaker.
Overall I am very pleased it was definitely worth the effort and I really enjoyed the journey building it.
Now I am ready to add a 2nd one to smooth the response as there are some dips I don't think I can get rid of however the rabbit whole goes deep and of course now I am thinking to do a 15 or 18" version. Saying that I am glad I went with an existing design to take the guess work out of the modelling process, all went smooth and worked perfectly at the first turn of the key.
Well done Steve with the design.
One thing I wanted to mention was that I used foam to line the inside as fiberglass particles are rather unhealthy in a "breathing" ported sub so wouldn't openly recommend.
Used Duratex with a spray gun and it worked quite well creating nice smooth finish. For the next one I will attempt to apply a gloss coat on top.
For a first DIY sub its a definite thumbs up! I am a believer now.
Looking really good dude.
On the next one, you should put a roundover on the ports internally that will help reduce chuffing a lot with a smooth air transition. You should also think about doing them on the exit too if you have enough material, even a small roundover there will help a bit.
Maybe add another panel of bracing inside too.
And yeah, I would say skip another 12 and go right for an 18. Since you will be going to the effort to build it, may as well get the size right. If I were you, I would build someting with a pro woofer in it next, they will be much better for cone control.
At least you got your fingers dirty, the more you do, the easier it gets and then the hobby takes on a new form. Its very rewarding hearing great sound come from things you have made.
I designed an 18" the other day which I will potentially be building for Paul, and possibly myself.
7cf about 200litre. 750H/500W/650D (mm)
This has a faital pro subwoofer in it, which would have absolutely vicious midbass and still extend pretty low, you can also plug the port to get a ~16.5hz tune. The main tune is 24hz.
These should be considerably better than an Ultimax for music if thats your thing, and you will find these drivers in cinemas, so they will have plenty of bass. They are really sensitive, so ULF output would end up pretty similar to an Ultimax anyway after some tweaking.
They are 8 ohms, so you could run two for 4ohm load and sent 1kw to them and they will be louder than you need. Very easy to drive.
Without highpass, box native response,
Highpass to protect drivers 1hz below tuning. This gives you an ideal M shaped cone travel graph for above and below tuning. With the 24hz tune both ports open you could throw almost 2kw at each of these drivers and not hit Xmax, the ports may start chuffing at near that level though, but it would be within limits.
If you plug the port you can throw about 1kw at each driver before xmax. But if you build just one and put it in a room with room gain, it will likely give you just about enough output for full reference levels including bass management to all speakers in an atmos system.