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Old 1 Week Ago   #1
 
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Default Quick question about port tuning

If I port a box at 28hz do I still get plus 6 db all the way to 80hz?
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Do you ever do any research on your own or do you want all of the answers just handed to you?
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Default Re: Quick question about port tuning

Quote:
Originally Posted by drop1 View Post
If I port a box at 28hz do I still get plus 6 db all the way to 80hz?
with proper use of polyfill you will get +10db

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Default Re: Quick question about port tuning

Donít tempt him . Iím sure heís got bags of the stuff .
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Default Re: Quick question about port tuning

Quote:
Originally Posted by drop1 View Post
If I port a box at 28hz do I still get plus 6 db all the way to 80hz?
What do you mean by this?

Just because I have 2000+ posts doesn't mean I have learned anything.
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Default Re: Quick question about port tuning

Quote:
Originally Posted by drop1 View Post
If I port a box at 28hz do I still get plus 6 db all the way to 80hz?
Let me know what you want drop1 and as soon as I find a moment Iíll model it for you. To answer your question though, no you will not realize a 6 db gain at 80 Hz if the fb is at 28 Hz compared to a sealed subwoofer.

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Default Re: Quick question about port tuning

model sealed and ported enclosures for given driver and overlay acoustic power graphs

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Old 1 Week Ago   #8
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Default Re: Quick question about port tuning

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Originally Posted by drop1 View Post
If I port a box at 28hz do I still get plus 6 db all the way to 80hz?
If it is that sort of box that you want, then it is called a bandpass.
It will be a 6th or 8th order.
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Old 1 Week Ago   #9
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Default Re: Quick question about port tuning

Drop1, what prevents you from learning how to graph this stuff on your own for analysis?

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Default Re: Quick question about port tuning

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Originally Posted by Lanson View Post
Drop1, what prevents you from learning how to graph this stuff on your own for analysis?
It's a fair question. I think we're all wondering the same.


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.... I could probably just teach you how to use WinISD so you could run these things yourself. Same with when you asked for info on what cubic feet something is. That's just math, easy math at that. Let's just teach you how to use something like Sketchup or whatever so you're comfy with making this stuff. It can be fun too. ....
...and be completely ignored.


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Default Re: Quick question about port tuning

Quote:
Originally Posted by rayray881 View Post
Do you ever do any research on your own or do you want all of the answers just handed to you?
Quote:
Originally Posted by miniSQ View Post
with proper use of polyfill you will get +10db
Quote:
Originally Posted by dsquared View Post
Donít tempt him . Iím sure heís got bags of the stuff .
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Default Re: Quick question about port tuning

IDK, I personally found it a lot of fun to get decent at WinISD and Sketch

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Default Re: Quick question about port tuning

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IDK, I personally found it a lot of fun to get decent at WinISD and Sketch
Absolutely!

I'm not familiar with Sketch, but playing with WinISD has been a lot of fun and absolutely fundamental to what little I've managed to learn about woofer and subwoofer systems.
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Default Re: Quick question about port tuning

If you are porting to 28, I doubt you'll hear any gain at all up around 80 Hz. Depending on box size and a variety of other factors, you'll usually get about one octave boosted (with a peak in the center). So tuned to 28, maybe somewhere around 20-40 Hz.
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Default Re: Quick question about port tuning

Quote:
Originally Posted by JMikeK View Post
If you are porting to 28, I doubt you'll hear any gain at all up around 80 Hz. Depending on box size and a variety of other factors, you'll usually get about one octave boosted (with a peak in the center). So tuned to 28, maybe somewhere around 20-40 Hz.
Or 25-40...
It drops like a rock on the low end of the port.
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Default Re: Quick question about port tuning

Which is something you want to happen, because a port unloading can be a gruesome thing, at high SPL. Best to also have a standard filter there in your DSP/head unit or at least at the amp, to prevent bad things.

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Default Re: Quick question about port tuning

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Originally Posted by Lanson View Post
Which is something you want to happen, because a port unloading can be a gruesome thing, at high SPL. Best to also have a standard filter there in your DSP/head unit or at least at the amp, to prevent bad things.
Even without a subsonic it will drop like a rock.
The subsonic just keeps it from destroying the subwoofer.

Drop: This is where a tunable PR allows one to adjust the tuning frequency post-facto. (Whether a 3" port is large enough for a Brahma I do not know... but you will want to know that up front)

Lanson: have you done any bandpass boxes using a PR for the lowest frequency?
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Default Re: Quick question about port tuning

Lol! Mr. ďPRĒ Holmz.

Iíd be interested in hearing about some of your band passes with PRs.
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Default Re: Quick question about port tuning

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Originally Posted by dgage View Post
Lol! Mr. ďPRĒ Holmz.

Iíd be interested in hearing about some of your band passes with PRs.
Me too
The Haus boss has a list of other things for me...
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Default Re: Quick question about port tuning

Quote:
Originally Posted by dgage View Post
Lol! Mr. ďPRĒ Holmz.

Iíd be interested in hearing about some of your band passes with PRs.
I have done several 4th orders bandpass enclosures before. What benefit or change would I see using a PR vs. a traditional port with a bandpass either 4th or 6th order
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Default Re: Quick question about port tuning

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Originally Posted by Holmz View Post
Even without a subsonic it will drop like a rock.
The subsonic just keeps it from destroying the subwoofer.

Drop: This is where a tunable PR allows one to adjust the tuning frequency post-facto. (Whether a 3" port is large enough for a Brahma I do not know... but you will want to know that up front)

Lanson: have you done any bandpass boxes using a PR for the lowest frequency?

Right, that's what I mean by gruesome. I mean subwoofer destruction. We're definitely covering the same concern.


I've not used a PR before in anything other than a bass-reflex type design. Sunfire subs are a good example of my involvement with them. I sold a lot of Sunfire subs when Carver owned them.


Personally, I don't like higher-order designs. I much prefer IB, Sealed, and Bass-Reflex type setups. With the excursion and motor strength of today's subwoofer drivers, a lot of the advantages of a high-order assembly are nullified.

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Default Re: Quick question about port tuning

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Originally Posted by Jroo View Post
I have done several 4th orders bandpass enclosures before. What benefit or change would I see using a PR vs. a traditional port with a bandpass either 4th or 6th order
It would be solely for the lowest frequency port, and mostly when that was desired to be in the <=25 Hz range.

I cannot see a reason to use a PR unless it is for a taking port that is a volume sucker and making it smaller... or making a noise chuffer port less noisy.
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Quote:
Originally Posted by JMikeK View Post
If you are porting to 28, I doubt you'll hear any gain at all up around 80 Hz. Depending on box size and a variety of other factors, you'll usually get about one octave boosted (with a peak in the center). So tuned to 28, maybe somewhere around 20-40 Hz.
This is the info I was after.

I was about to build a box (wood and saws were out) but wasnt sure how port tuning affected higher frequencies.

Every time ported vs sealed is mentioned everyone just gives the dumbed down answer of ported adds about 6 db. Nobody ever goes into detail about how that's only in a particular frequency region.


I ported it to 31 with a 1.5 x12 slot port. I wish I had ported it closer to 35 but it's just a test box so no biggie.

Sounds pretty good. Box is too small though. 1.35 before sub displacement tuned to 31. I did add about 2 pounds of poly just to break up any resonance that may be floating around in there .

This is the result vs the original sealed enclosure without the poly so its come a long way.
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Default Re: Quick question about port tuning

Quote:
Originally Posted by drop1 View Post
...
Every time ported vs sealed is mentioned everyone just gives the dumbed down answer of ported adds about 6 db. Nobody ever goes into detail about how that's only in a particular frequency region.
...
The port is resonant at a specific frequency... sort of like a swing set is resonant. You can kick your feet all you want, but the swing goes at its frequency.
(Although a swing set is a higher Q system than a port.)

The reason bass reflex are used is because the lowest frequencies suck up the majority of the power.
As the frequency goes higher the linear displacement does not need to be as high.

If you want 31Hz and 80Hz you need a 31Hz port,and an 80-Hz port. If you want a third frequency, then you need to add a third port.


Quote:
Originally Posted by drop1 View Post
If I port a box at 28hz do I still get plus 6 db all the way to 80hz?
Your measurement curve has answered this for you.
(So good job on that)

The curve looked like you also have more power at 50 Hz which goes to show that Q must be somewhat low.
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Default Re: Quick question about port tuning

You could go with a double chamber ported enclosure to obtain more mechanical power handling, but I don't think you'll have the space for that.
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