8 inch woofer questions

[JonnieBlaze 0]

I didnt want to clutter up the thread that was talking about the upcoming E8 woofer but I had some questions about it in relation to other sized woofers. I can not find anyplace in my town that sells or even has 8 inch woofers on display so I can hear. I have no idea what kind of bass come from the 8 inch woofers. All I'm familar with is the bass that comes from my two 12 inch Cerwin Vegas in a sealed enclosure. I'm looking for something punchier (the bass from the 12s seems muddy) but I still want it to get as loud at the lower frequencies as my 12s do (so I'm looking at 4 of these E8s). I just need to know if the 8s will deliver this punchier bass....i'm assuming they do but again I've never heard any 8 inch woofer...

[///M5 2,833]

Punchier has nothing to do with size and everything to do with the enclosure, although depending on which CV's you have they may never give you what you want.

[JonnieBlaze 0]

I thought the punchy bass was just a higher frequency sound therefore an 8 inch woofer would replicate that higher frequency better than a 12. But I take it that's incorrect?

So with these new 8 inch woofers being created here, what kind of box would produce the sound i'm looking for? I've only ever had sealed enclosures (because I assumed they gave the tightest feeling bass). I thought ported box just gave the loud boomy bass so I never wanted them. I thought bandpass boxes were designed for speakers that you were under-powering. And I know nothing about infinite baffle.

All I know is what I'm looking for...but I'm not sure how to get it.

[sundownz 197]

These 8s sealed would be very "punchy" IMO. I think you are looking for a lower Qtc alignment since the muddy sound you describe may be a peak in the 50s from a box that is too small. Fortunately a "big" box for the 8s is still incredibly small.

[JonnieBlaze 0]

A lower Qtc alignment eh? How low of a Qtc is needed to achieve this sound?

Sealed Box:

0.280 ft^3 w/ F3 of 50 Hz (Qtc = 0.707)

If I made the box slightly larger than this, it would yield a lower Qtc?

[sundownz 197]

Yep - 0.35 ft^3 would give you a 0.671 Qtc.

Stuff some poly in there for even lower.

[JonnieBlaze 0]

F3 is where the sound drops by 3 db right?

so with the 0.280 ft^3 box, anything less than 50 Hz is going to be pretty quiet (unless you have many drivers).

what would the F3 be of the .35 ft^3 box?

Edited May 14, 2008 by JonnieBlaze

[sundownz 197]

F3 is where the sound drops by 3 db right?

so with the 0.280 ft^3 box, anything less than 50 Hz is going to be pretty quiet (unless you have many drivers).

what would the F3 be of the .35 ft^3 box?

Not in a car - the vehicle transfer function will make the driver pretty well flat to ~20 Hz with a 50 Hz F3 out of car.

The F3 is very similar in the larger box, but it extends the very low-end slightly and increases efficiency.