WinISD vs RE Suggestions

[bitwise 10+ year member]

I made a new project using the specs for the RE8 for WinISD that req posted. I entered a sealed enclosure, 1 driver and WinISD recommended I give the sub 0.328 ft^3 of space. According to the RE site, it recommends I do .217 ft^3.

What should I go with?

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[Black_Jesus 10+ year member]

re's specs

winisd blows

 

[jeremyG]

I made a new project using the specs for the RE8 for WinISD that req posted. I entered a sealed enclosure, 1 driver and WinISD recommended I give the sub 0.328 ft^3 of space. According to the RE site, it recommends I do .217 ft^3.
What should I go with?

RE...has real world experence with the driver...

winISD...is a free program for a reason.

 

[bitwise 10+ year member]

The only reason Im considering using WinISD's specs is because someoene else I know made a sealed box for 4 RE8s and he used the RE specs, and said it wasnt loud enough. He actually suggested going with .32cubes each. Im not sure if he got that number from WinISD or if he just guestimated it.

Anyone else with sealed RE8 experience here?

 

[squeak9798 5,000+ posts]

There is no "right" number to go with. It will vary from car to car, install to install, personal preference to personal preference. IMO it's best to build big, and if you don't like you can always just add something to the inside of the box to make it smaller (assuming it's a sealed box)

 

[req 5,000+ posts]

yea, winisd isnt perfect. there are a few things about it, but it can help significantly if you dont know what you are doing 80% ya know?

it will help fill in the gaps, but doing it by hand with a calculator is the best. and try to stick to RE specs, but you can always build a new box. if your friend suggested different, try it. no harm done... maybe $20 lost. and you might be able to salvage the wood.

its just a box man =)

 

[DFW40 10+ year member]

To have a Qtc of .707 you need .28 cubic ft.

If you had the .38 cubic ft. your Qtc would be .65 of so.

I always prefer the lower Qtc for a smoother deeper sound than the higher qtc which tends to have a peakier response. It also depends on which which way the sub faces in your vehicle on which one will sound better. If you face it towards the back in a trunk go with a higher Qtc and if it fires into the cabin go with a lower Qtc. IMO

 

[bitwise 10+ year member]

Thanks for the info guys. I am not really familiar with Qtc. I will be downfirining these subs in an extended cab pickup truck underneath the backseat.

Is .707 the ideal Qtc to shoot for? WinISD says to go with .322 ft^3 to get that exact Qtc. The Fsc with that is 47.77 Hz. What is that?

If I plug in .217 cubes like they suggest, I get:

Fsc: 55.55 Hz

Qtc: .811

I prefer the deeper rumbles as well. I definitely dont want to lose out on any performance with these subs..

 

[squeak9798 5,000+ posts]

What Qtc you prefer is really dependent upon your own personal tastes. Qtc of .707 is considered to have the best "trade-offs" performance wise. But, once you stick the box in your car, the frequency response characteristics offered by the box pretty much go out the window since your car will have a major impact on the frequency response of the system.

But, here is something to let you read up on Qtc:

http://www.carstereo.com/help/Articles.cfm?id=29

 

[DFW40 10+ year member]

Squeak is right about the bigger box and tossing in a block of wood. I would say go with the bigger box for that particular vehicle, if you build the box to .4 cubic ft you can always throw a chunk of wood in the box to take up space. A 4 by 4 that is 11 inches long takes up .10 cubic ft.

 

[Vausen 10+ year member]

How does winisd recommend a size and why do you need a Qtc of .707? I just look at the gain plot from winisd and try to get a flat response that reaches as low as possible. .217 ft^3 does that better than any other size box so why change it unless you want your box to be peaky.