A Cadence iA7 and a Sundown 1000d are both too powerful for a pair of BM mkIII's. You will need to be extremely careful with how much power you are sending the drivers. Keep in mind that power handling is not a power requirement.

 

yessir, I'm careful. I have the iA7 on a pair of Adire Koda drivers at the moment which are 300w power handling each. Gain is barely tapped, I listen for SQ and not major boom anyways.

I may try wiring at 4 ohm as well which should give each driver 250 watts.

 

The box requirements are .5 cubes. the displacement is .05, so .505 total? Do you need to calculate in the thickness of insulation lining the walls of the box? If it is such a small box and a great woofer(not questioning that) why all the extra things needed? Such as lining and fill.http://www.bcae1.com/spboxnew2.htm

 

The insulation/stuffing provides the benefits of a larger box but without the reduced power handling of an *actual* larger box. It's basically a win/win.

 

cool

 

and how much polyfill and insulation do you put in? do you weigh it? Confused on that

 

It would actually be 0.55, not 0.505. But you really don't need to worry about that because the performance of the driver isn't going to be affected that much from changing the enclosure volume by such a small margin. If you built an enclosure that was 0.8 cubes vs 0.5, you would see a big change. But whether its 0.50 or 0.55 won't have that much of an impact.

However, leaving the enclosure with zero stuffing will have a big impact. Lining the walls with fiberglass insulation smooths out the response as the fiberglass reduces internal resonances and damps the enclosure walls by absorbing acoustic energy. And because fiberglass reduces acoustic energy, it also acts like polyfill by fooling the driver into thinking it's in a larger enclosure which gives you a tad more low end extension. Like MOford21 said, It's really a win-win situation.

And honestly, I never weigh polyfill. I always lightly tear the poly apart and then stuff the entire enclosure. You don't have to be that **** when stuffing an enclosure with polyfill. But, I always line the walls with fiberglass insulation before lightly stuffing the enclosure with polyfill. You do need to watch out though an not place the poly directly behind the driver or it will get sucked up into the pole piece while its being played.

 

Here is a dumb question....... Are you talkin about the pink insulation from home depot to line the walls? Are we talkin 1" thick, I have only seen the pink stuff that is 4" thick???????

 

i don't think its a dumb queation, i have been wondering the same thing. my plan was to glue or staple some to the sides of my box.

 

there are rolls that are 4-6" wide and about 1/2 to 3/4 thick that are stuffed around windows and doors during construction.

 

I'm talking about this kind of insulation: http://beta.lowes.com/pd_35136-1722-...4937087_?No=30 It's a tiny roll encased in plastic. Basically the smallest, thinnest, roll of fiberglass insulation you can purchase. Usually it costs between $4 and $12 per roll. Use 3M spray adhesive to adhere it to the walls of the enclosure and you're good-to-go!

 

Would you still do something like that if you have enough space to build the box to specs?

 

Damn..how did I miss this preorder Always a day late and a dollar short. Right when I was in the mindset to redo my stereo system.

 

Yep, I missed out also. Now SI is not taking orders until they figure out what is available. Oh well, I went with ID instead only because I can't wait anymore. The wife said if I'm not happy I can always buy SI later, but I'm sure ID will more than satisfiy me. I'm extremely happy with my ID components. GO SAINTS!!!!

 

Yes I would. Here's what I said a few posts up:

I never build a sealed enclosure without lining the walls with insulation and then lightly stuffing it. I had a few people help me with a build a few cars back and I had them go ahead and install the subs in the round tub that was in the spare tire well. I didn't notice that after the subs were installed the fiberglass and polyfill bags were still sitting on the side of the install bay. But less than 10 minutes after I fired the system up I rolled down the window and said "you guys forgot to put the fiberglass and polyfill in didn't you?"