winisd plot graph help please

[Rooster009]

So i'm planning on building a couple of enclosures but I don't know how this plot will sound. Some help from anybody with some experience is highly appreciated. Is there anything that looks bad about this graph?

Thanks Rooster

[wcoffey81]

what graph?

[Rooster009]

Sorry I forgot the plot

[1958Bassman]

The box is pretty small for that driver and in that size, the tuning frequency is high and the combination kills the power handling ability. The last thing you want to do is send signal that's significantly lower than the port tuning frequency.

Try 3ft³- it will be smoother and the tuning frequency can be placed lower. You may need to use two 3" ports.

[Rooster009]

Ok I'll redo a couple of things. This graph is in a 2.9ft3 ported enclosure with a tunning of 46hz. Thanks 1958Bassman

[rpsands]

46hz is a fine tuning for bass guitar and that graph looks fine if you want some upper bass boom.

Tune it lower if you want less boom, but you'll have to give up some low end to smooth it out.

[Mr. Foxen]

You need to look at the max power handling graph too.

[ThisBass]

Originally Posted by Rooster009

Sorry I forgot the plot

Graph looks great like an Eminence Deltalite.


Max power plots are hard to understand.
The summary of all the potential amp power is never ever at a explicit point of a singular frequency.
But low frequency transients can do similar behaviors depending on EQ settings and playing styles.
But that is depending on EQ settings and playing style and different stuff as well ...

[Rooster009]

Ok guys, how about this graph does it look any better? I lowered the tuning to 38hz. Hopefully it will give me enough low end extension without loosing to much power.

[ThisBass]

Originally Posted by Rooster009

Ok guys, how about this graph does it look any better? I lowered the tuning to 38hz. Hopefully it will give me enough low end extension without loosing to much power.

No

base reinforcement is flattened (underneath appro 50Hz your cab will do nothing like zero), air velocity at the ports is probably too fast, and I have to tell that WINIsd calculates ports dimensions sometimes very wrong. So be careful with port WINIsd dimensions.
It's a good idea and good practice to estimate fine tuning of port dimensions by ears.

[Rooster009]

Thanks ThisBass. I've decided to model a new speaker. I really don't know how to read theses graphs but i know how to put the numbers in Winisd. So, here is a new speaker graph. Am i getting closer to a good graph.

[ThisBass]

Originally Posted by Rooster009

Thanks ThisBass. I've decided to model a new speaker. I really don't know how to read theses graphs but i know how to put the numbers in Winisd. So, here is a new speaker graph. Am i getting closer to a good graph.

that's a disaster



your first choice was best

[1958Bassman]

Originally Posted by Rooster009

Ok guys, how about this graph does it look any better? I lowered the tuning to 38hz. Hopefully it will give me enough low end extension without loosing to much power.

Keep playing with the box volume. It will flatten the response but it will also handle more power if the box is more responsible for the low end. 4ft³ isn't terribly large, unless you're trying to fit everything in a small car.

Think of it this way- a speaker works by making air vibrate and a large volume of air will cause a room's air to vibrate more efficiently and with better results than a port, which works in the same way as blowing across a bottle top. If the box is too small and tuned wrong, a driver that's rated for 500W might be able to only handle 20W in a range that's critical for the sound of the instrument. This is one area where WinISD should have a graph- Bass Box Pro has it and all of Wayne Harris' other programs have it- that's why they're so popular. Eminence's design software is Harris', too.

You can call Parts Express to have them model this for you and they use the same software, so they can tell you if the box will work best.

[Rooster009]

Ha Ha!!!! Ok, I guess I'm doing something wrong. I'll mess with it some more and look at some other graphs on the eminence website. Maybe i can figure it out in a couple of days. Thanks guys.

[1958Bassman]

Originally Posted by Rooster009

Thanks ThisBass. I've decided to model a new speaker. I really don't know how to read theses graphs but i know how to put the numbers in Winisd. So, here is a new speaker graph. Am i getting closer to a good graph.

That's not a bad curve, but it's a bit large. I bought a Delta 12LFA an it comes up with ~3.9ft³ without altering anything and when I called Eminence about a 2.15ft³ box, he said it would only handle about 120W, so that's really not a good option fro high power use. I'm working on a box that's 3.4ft³, which will work better and handle the power. Better response, too.

When I modeled it, the box came out to 1.595ft³. Two 3" ports @7.21" long tunes it to 48.14Hz-

[Rooster009]

The speaker is a Dayton Audio PA380-8 15" woofer. I have all of the Thieles in and after selecting vented enclosure, it tells me it needs a 1.595 cubic foot enclosure tuned to 48.15 hz, with one 4.02" port 6.13" long. It doesn't look right to me but here is the graph. something has got to be a miss.

[1958Bassman]

Originally Posted by Rooster009

The speaker is a Dayton Audio PA380-8 15" woofer. I have all of the Thieles in and after selecting vented enclosure, it tells me it needs a 1.595 cubic foot enclosure tuned to 48.15 hz, with one 4.02" port 6.13" long. It doesn't look right to me but here is the graph. something has got to be a miss.

Why does it have to be wrong? It won't do 20Hz- it's not a subwoofer made for a small volume like a car, it's made for musical instrument/PA to be used in a larger room.

Look at the velocity on the page for the vent- the numbers yuo want are less than .15 and the green numbers are good, red is bad. It's not a problem if the red numbers are at the green/red intersection- that's just a demarcation point for rule of thumb WRT port noise, called 'chuffing'. If you use two 3" ports, the velocity will be lower and the phase response will be better.

If you want to see the power handling capacity, download WinISD Pro- it has a lot more detail.

[Rooster009]

Ok, I will download it. I've been using the winisd beta and I can't find the port velocity and stuff your talking about. I really appreciate the help guy's.