been reading this topic with interest and have a noob question regarding enclosure volume. should DOS have their own volume calculations just like sealed and ported have, i say this because with ported the pressure acts against free moving air in a port and, in sealed the pressure acts against a 'static' cabinet, but with DOS the pressure is working against an 'active environment/element'. in my mind using calculations/volumes that were intended for ported/sealed seems incorrect.
if i've missed the point or am over thinking this, please let me know.
G
if i've missed the point or am over thinking this, please let me know.
G
This whole thing is very cool! BUT you did not label the electron flow direction on the clamps! How will the electrons know where to go?!?
Your water test reminds me of an old Lexus commercial. But even better than that, a gearhead buddy who convinced his friend (who had worked at Amoco doing research for Oldsmobile) to put an Olds engine into an El Camino. Oh LORD what a mess of a project. However, when it was done, you could not even see that it was running. The only motion was the pulley belts. Super super smooth, ya genius Mike miss the hell out of ya (Mike didn't take care of himself and dropped dead in front of his kids at age 37 😢)
By that last bit do you mean the other speaker?
The 2 drivers act as one large compound driver (Fs’ = Fs, Vas’ = 2x Vas, Qts’ = Qts). A sealed box acts like a sealed box and a vented box acts like a vented box.
dave
And don't measure a woofer hanging from a chain, as was the practice at one shall-remain-anonymous former employer of mine, that does not work! Hmmm maybe that has some contribution to why they are out of business...
Hi,
Just like any multi driver enclosure, the volume each driver will see is what you consider. It's no different than as if the drivers were not opposed, both just facing the same direction on the same baffle sharing a volume they both see. The only change is when you align them so they're in opposition, the forces inside the box get canceled between them.
Very best,
I have 4 of those drivers, they're great when on sale. Good for their excursion too.
Very best,
You know... I'm looking at your plan ... and I like it. Let me know if you'd hate me copying it : )
Not at all, it's just a sealed sub at the end of the day with 2 drivers. I would say, do it better by using 15" drivers or bigger and wire them in parallel and couple them closely and I would do my bracing differently (just stud bracing) to avoid any potential pockets in the corners with my current brace I used there. I should have put circle cuts in the corners to open them to allow flow.
Very best,
I think I'm actually going to make it a bit wider with drivers closer... and hope sides don't flex too much. I have high hopes for this sitting sideways (drivers up/down) and getting slid under some furniture ... maybe 13" max. then a few short legs to keep the cone from hitting the floor ; ) Probably a bad idea but WAF is critical here. If I had measurement skils and equipment, I'd report back.
It will work. These will not flex material much. My material here is 15mm (5/8th inch thick) with a single brace. You can see my waterfall to see resonance. It's good. The cone will not stick out too far, you'll be ok with basic feet, it's more the output and effect of potentially mass loading the driver and sag consideration if you arrange it so the drivers droop to gravity but it will still work likely fine.
Very best,