Bandpass question/discussion..

[Savant 10+ year member]

Ok guys, here's the thingy..

First off, this plot is probably pointless since the woofer used isn't the one going in the box, I had to pick something that I thought 'might' be close (looking at TS-W1041DVC but there isn't on in WinISD and can't find the specs for those.. so.. guessing )

So.. now.. This is a 4th Order Bandpass.. has 4 ports (2.5" each, mach 0.01).. tuned to 115 Hz..

Here is the question.. would a 6th Order reduce the sag in the middle of the range? If so, how much? (guess).. How would I go about trying to figure out the front/rear chambers, ports, etc.. WinISD doesn't support 6th order..

I looked at maybe using straight ported but that's a bit off looking.. sealed might be the way to go on the 10"s too (the 12"s will be sealed I think.. maybe ported.. haven't tried plotting those yet)..

So.. 6th Order... ? Worth it for what I want? (that being the 10"s subs to run ~75Hz to ~175Hz)..

Here is the image (kinda *****.. sorry)

Thanks //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Man.. that's bad.. K, front chamber 0.7 ft^3, rear chamber 0.405 ft^3.. frequency 115.. 4 2.5" ports 3.77" long.. If you need more info, let me know..

K.. the peaks are at +9dB, the valley at +5db.. 75 Hz (+6dB) is about the same as 175 Hz (+6.3dB)..

Click to read more...

 

[Savant 10+ year member]

Originally posted by Jmac LOL, you're running 1800 watts man ! Sealed should be more than loud enough //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Jmac-ster //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Yeah.. but.. I was looking over some wireing diagrams today... a calculator.. there is NO way I can run all 1800 Watts.. that's like 260 Amp draw at clipping.. I bet my Alt is only 120amp (if I'm lucky).. So, I was looking at running the 12"s at about 200 Watt and the 10"s around 150.. (looking at wiring it that way too.. so if I run it up too high I'll blow fuses //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif )

Cause I'll be running so low (compared to what I could be) I'd rather maximize what I can.. bandpass is great for the range I want if 6th order flattens out that dip a bit (plenty of room in the back of my S-10 Blazer if it requires large boxes).. Just not sure how to go about checking it.. ya know?

Anyway.. I could probably get away with sealed on all 4 speakers.. but c'mon, what fun would that be??? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Savant 10+ year member]

A) I love a challenge.. if I mess it up and it sounds shi**y, I fall back to sealed/ported //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

B) ported don't really increase SPL at the given tuned Hz, do they? I mean, a little, but not like bandpass (looking at around 9dB bandpass.. doubled 3 times in loudness, right? 3dB doubles perceived loudness?)..

C).. hmm.. *shrug* I get the idea you are trying to get me to do this the easy way //content.invisioncic.com/y282845/emoticons/nono.gif.eca61d170185779e0921b0faa9704973.gif

But, all in all.. you are probably right.. Ported and be done with it.. given the stock nature of the rest of the system, I'll still be drowned in Bass... *sigh*.. still, what's the point of trying to be an Audiophile if you don't get to make nifty stuff? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Savant 10+ year member]

*sigh*

I guess I have to agree.. unfortunately..

I'm looking at the ported, and it's a bi*** to get a smooth curve at around 115 Hz.. the sealed is pretty smooth, a bit of a hump at ~92 - ~100.. but only like 2 dB higher than the low points in what I'm shooting for..

Oh well.. Unless I get the T/S.. I guess I don't have much of a choice, huh?

I'll keep my fingers crossed for those specs when the speakers get here //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif If I get them, you are gonna have to help me find a 6th order plotter //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

If I'm gonna go sealed.. would it be better to go iso-baric? To do that, are they in phase or out (they push on each other, or help each other).. That has a much smoother curve, like .5 dB across the whole 100 Hz.. Though, I'm not entirely sure what is required to make a solid iso-baric setup..

 

[Savant 10+ year member]

WinISD Beta 0.44... no idea.. got it from their site..

Does Pro do 6th order?