narrow bandpass xover with zobel?

OK... Many more issues revealed with that last post. Off-axis response refers to the lowering of output in an increasing amount, based on the angle in degrees you are off from zero degrees. (Looking straight onto the driver's radiating surface.) In the image below, the woofer (or ANY driver) is facing out to zero degrees. The concentric circles are dB levels, and as you move inward, the attenuation is greater, or the output is less. As frequency goes up, the output begins to look more like the blue circle. You'll see that at the highest frequency demonstrated in this graph, at 90 degrees (up) and 270 degrees (down) the output for this particular driver is effectively zero. That is "beaming". In this particular graph, the blue circle indicated 40kHz, but it is only for demonstration purposes. The larger the diaphragm, the lower the frequency of the blue line. A woofer 8" in diameter will start to "pull in" (beam) at a much lower frequency than will a one inch tweeter. The 45Hz-7kHz claim for your chosen woofer is ONLY avaialable if you are looking straight onto the cone. I'll add more today. I have a gues that JUST arrived. PS... While researching this answer, I found this page.... Handy. I know *I'm* bookmarking it!It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Woofers in the rear deck?  Ugh.  Here's my recommendation for you.

1.  Set up your subwoofer.  Note the LP filter point you use for the sub (should be somewhere between 70-120Hz.)

2.  If you insist on keeping those Goldwoods in the rear deck, use the crossover built into most amplifiers and set up a HP filter at the same Xover point as your subwoofer LP.  Then either use an external active system to LP the woofer at 240Hz or build a passive for it.  Or better yet, move them to kick panels in the front, or even get rid of them out of your system.3.  Install a good 6.5" component set in the front.  HP the components using their amplifier Xover at either at the LP of the 8" woofers or if you can them, at the LP of the sub.  Use the passive Xover that comes with the component set as intended by the manufacturer.  Done.

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meicalnissyen wrote: DYohn wrote: Woofers in the rear deck? Ugh. Here's my recommendation for you. 1. Set up your subwoofer. Note the LP filter point you use for the sub (should be somewhere between 70-120Hz.) 2. If you insist on keeping those Goldwoods in the rear deck, use the crossover built into most amplifiers and set up a HP filter at the same Xover point as your subwoofer LP. Then either use an external active system to LP the woofer at 240Hz or build a passive for it. Or better yet, move them to kick panels in the front, or even get rid of them out of your system. 3. Install a good 6.5" component set in the front. HP the components using their amplifier Xover at either at the LP of the 8" woofers or if you can them, at the LP of the sub. Use the passive Xover that comes with the component set as intended by the manufacturer. Done.

Put the woofs in the kick panel?? how bout the pillar instead   ;-) So, you actually reccomend nothing on the deck, and in essence, a nice 6.5 set in the doors handling everything the sub passes

meicalnissyen wrote: Put the woofs in the kick panel?? how bout the pillar instead   ;-) So, you actually reccomend nothing on the deck, and in essence, a nice 6.5 set in the doors handling everything the sub passes

Yes. 

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And I CANNOT believe how much infrasonic information I was losing through my roof! Two layers of Dynamat Extreme, and a layer of aluminum lined cotton felt later, my bass is even deeper and tighter than it WAS! (That's what the guest was coming over for... we were damping my roof today.) Oh, and the AC works even BETTER now, too! (This, due to the insulative properties of the applied materials.)It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

haemphyst wrote: And I CANNOT believe how much infrasonic information I was losing through my roof! Two layers of Dynamat Extreme, and a layer of aluminum lined cotton felt later, my bass is even deeper and tighter than it WAS! (That's what the guest was coming over for... we were damping my roof today.) Oh, and the AC works even BETTER now, too! (This, due to the insulative properties of the applied materials.)

the M1A1 abrams has a much stiffer cabin, might be a good choice for competition