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#282324 - 12/14/09 01:57 AM Re: CSS? [Re: fredk]
BigHonu Offline

Registered: 08/15/09
Posts: 198
Loc: In the middle of the sea

Doh! The PE HPSA500 is already on its way!

Thanks for the suggestion though! If I were smarter, I would have designed the box to not house the plate amp, but just have it on the side. At least if other power options came up I could easily accommodate them.

Need to look up the Tapco. First time I've heard of it.

The enclosure is just about done and is just waiting for the primer to dry, the paint to go on, and the feet to be attached.

#283007 - 12/18/09 07:27 PM Re: CSS? [Re: BigHonu]
BigHonu Offline

Registered: 08/15/09
Posts: 198
Loc: In the middle of the sea
Well, the new Tempest X2 is up and running. I have the pics over here: if anyone was interested.

So far, it is doing great in my room. I never could get a 20hz tone to register on the Radio Shack meter with the BIC F12, but the Tempest easily puts out 20hz and lower (measured to 17hz about 12dbs down).

#283020 - 12/18/09 10:18 PM Re: CSS? [Re: BigHonu]
jakewash Offline
shareholder in the making

Registered: 12/26/03
Posts: 10412
Loc: Calgary, Alberta
Considering the FR of the Bic F12 is only 25-200hz it is not surprising you do not register anything with a 20 hz tone. I suspect that the 25 hz is already 6db down as per normal spec ratings and things roll off very quickly after that.

The Tempest looks good, nicely done.


#283054 - 12/19/09 04:46 AM Re: CSS? [Re: jakewash]
BigHonu Offline

Registered: 08/15/09
Posts: 198
Loc: In the middle of the sea
Thanks Jay! While I knew it was going to make a difference I never realized it would be of the magnitude I see. I can understand why people who buy quality subs for the first time have such positive reactions to them. It is quite addicting. I'm going to have to see if I can get the F12 setup as a midbass unit or something just for kicks.

#283078 - 12/19/09 03:19 PM Re: CSS? [Re: BigHonu]
fredk Offline

Registered: 12/06/07
Posts: 7718
Loc: Canada
Nice build. I was surprised at how much a good sub adds to the movie experience. I will never go without one now.

Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!

#283103 - 12/19/09 06:45 PM Re: CSS? [Re: fredk]
Adrian Offline

Registered: 12/27/08
Posts: 6772
Loc: It's all about the location.
Well done BigHon. Did you use a program to figure out the box dimensions or was there a recommended box size and design supplied with the driver?

BTW, the Tapco Amp that Fred mentioned is made by Mackie, very well known in the pro audio business. Consider the Tapco to be Mackie's affordable line and the "Juice series" is similar to some of the Behringer and QSC GX amps in their design and output.
Half of communication is listening. You can't listen with your mouth.

#283154 - 12/20/09 01:52 AM Re: CSS? [Re: Adrian]
BigHonu Offline

Registered: 08/15/09
Posts: 198
Loc: In the middle of the sea
I used WinISD to help with the modeling. Really came in handy when trying to figure out the effects of different PEQ settings and their effect on response and cone excursion. I know that with the amp I have, in the box that I have, I don't need to worry about exceeding Xmax at any point. The amp will start to clip before I start to hear the driver complaining. What also helped was that Home Theater Shack had a ton specs for drivers in their database. It was just a matter of loading in the correct profile to get the TS parameters.

Previous to using the freeware, I used the Tempest application notes to get a brief overview of what a box this size can do.

I still may go with a 5.5 cuft ported design as it offers up FLAT response to 15hz AND higher efficiency. However, I have always been more partial to sealed designs so I'll see how this one works out for now.

Besides, since my wife was wondering about when the matching box for the other side of the couch was going to be completed, I'm willing to gamble that dual sealed 15's should work out well!

I'm such a noob when it comes to pro style amps. Would I need to rig a switch to power them on and off, or do I need to remember to turn them on and off all the time?

Edited by BigHonu (12/20/09 01:59 AM)

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