I have built many fiberglass enclosures that have always been sealed. I have never been a fan of ported enclosure....until now I guess. I am helping a friend with his system.
Amp: MRD-M605
Sub: JL 10" W6v2
Box: .75 or .9 (he has two to choose from)
So I instructed him on tuning an amp/sub and he is not getting the bass he wanted out of the W6. So my question is, if we wanted to take one of his existing boxes and port it, how do we find out what diameter, length, flare, etc we need? Also I'm pretty sure I read that the port must be mounted on a certain side of the box (maybe it's preferred that its mounted with the exit facing the same side of the box as the cone. Also do you subtract the port volume from the box volume to meet their recommendations, or is that size measured just as a sealed enclosure would be?
Here are the sub specs...
Size: 10 -inch
Impedance: 4 ohms
Cone Material: Mineral-filled Poly
Surround Material: Foam
Ideal Sealed Box Volume (cubic feet): 0.625
Ideal Ported Box Volume (cubic feet): 0.75
Port diameter (inches): N/A
Port length (inches): N/A
Free-Air: No
Dual Voice Coil: Yes
Sensitivity: 83.7 dB at 1 volt
Frequency Response: 23 - 250 Hz
RMS Power Range (Watts): 150-600
Peak Power Handling (Watts): 1200
Top Mount Depth (inches): 6 15/16
Bottom Mount Depth (inches): N/A
Cutout Diameter or Length (inches): 9
Vas (liters): 33.4
Fs (Hz): 28.5
Qts: 0.469
Xmax (millimeters): 15.2
if it's a fiberglass box, I bet a new box would be in order. Tuning would be dependant on how low, or high he wants it. And does the amp have a sub-sonic (infrasonic) filter?
First, gather what dims the box will be, minus port displacement and we can calculate port length, width and height.
Why waste the time and effort porting an enclosure that's already built? You are going to be better off simply getting the dimensions off JL's website and building a new box exactly to their recommendations. Sounds like that's your best bet right now.
I love when people say "I'm not a fan of ported enclosures". They clearly haven't heard a properly tuned and installed setup using one. I'm not saying everyone NEEDS to be an audiophile, but don't judge things like ported vs. sealed enclosures based on rumors, myths, and hear-say. Listen to something setup by someone who KNOWS what they are doing. Most people "don't like ported" enclosures because all they have heard are the ported enclosures that their punk friends have thumping around town just to be loud and piss off neighbors.
On the other hand....you have other fingers.
Liquor is not a drug John, liquor is not a drug.
JLAudioCavalier wrote:Why waste the time and effort porting an enclosure that's already built? You are going to be better off simply getting the dimensions off JL's website and building a new box exactly to their recommendations. Sounds like that's your best bet right now.
I love when people say "I'm not a fan of ported enclosures". They clearly haven't heard a properly tuned and installed setup using one. I'm not saying everyone NEEDS to be an audiophile, but don't judge things like ported vs. sealed enclosures based on rumors, myths, and hear-say. Listen to something setup by someone who KNOWS what they are doing. Most people "don't like ported" enclosures because all they have heard are the ported enclosures that their punk friends have thumping around town just to be loud and piss off neighbors.
I don't like ported enclosures
shut up Brad.
On the other hand....you have other fingers.
Liquor is not a drug John, liquor is not a drug.
Well..............
Technically even a properly tuned ported box will sound different than a sealed box. With all the freq peaks and tuning freqs and roll offs and such.
Unless you were to say tune stupid low (like 20 or 22 hz) in which case the peak would be so low that the box would sound similar to a sealed box.
But the everyday audio listener probably wouldnt notice a difference.
JLAudioCavalier wrote:I love when people say "I'm not a fan of ported enclosures". They clearly haven't heard a properly tuned and installed setup using one. I'm not saying everyone NEEDS to be an audiophile, but don't judge things like ported vs. sealed enclosures based on rumors, myths, and hear-say. Listen to something setup by someone who KNOWS what they are doing. Most people "don't like ported" enclosures because all they have heard are the ported enclosures that their punk friends have thumping around town just to be loud and piss off neighbors.
You are extremely knowledgeable about audio, and you have given me probably TOO MUCH free knowledge, but honestly, I think (remember...this means it's my opinion) you are too arrogant. How can you assume I don't like them for a certain reason? Or assume I haven't heard a properly installed and tuned box? How do you know it's not as simple as it being that I just prefer the simplicity factor of a sealed enclosure? I'm not meaning to hate on you, I've just had a bad morning so far (spilled 16oz coffee in my new car, and got speeding ticket on my way to the car cleaner to vacuum it up) and I just dislike assumptions.
But thank you for your guy's help...his box is a MDF box, so I figured it'd be as simple as giving the volume, and sub specs, and then cutting a hole for a drop in port ordered to the specs you guys could provide.
Mr Focht- Yes it does have a sub-sonic filter, and I'm not sure the dims of the box. Are those needed? Thanks!
where in mn are you again? i can come out and help one of these days. i know about how to tune boxes and build high output enclosures. (yes here comes the hate).
click sig for my car audio videos
yes, will need to know internal dims, so we can figure if the port can be X in heigh and width, and depth. Without adding an L into the port equation.
SEC-Z wrote:JLAudioCavalier wrote:I love when people say "I'm not a fan of ported enclosures". They clearly haven't heard a properly tuned and installed setup using one. I'm not saying everyone NEEDS to be an audiophile, but don't judge things like ported vs. sealed enclosures based on rumors, myths, and hear-say. Listen to something setup by someone who KNOWS what they are doing. Most people "don't like ported" enclosures because all they have heard are the ported enclosures that their punk friends have thumping around town just to be loud and piss off neighbors.
You are extremely knowledgeable about audio, and you have given me probably TOO MUCH free knowledge, but honestly, I think (remember...this means it's my opinion) you are too arrogant. How can you assume I don't like them for a certain reason? Or assume I haven't heard a properly installed and tuned box? How do you know it's not as simple as it being that I just prefer the simplicity factor of a sealed enclosure? I'm not meaning to hate on you, I've just had a bad morning so far (spilled 16oz coffee in my new car, and got speeding ticket on my way to the car cleaner to vacuum it up) and I just dislike assumptions.
But thank you for your guy's help...his box is a MDF box, so I figured it'd be as simple as giving the volume, and sub specs, and then cutting a hole for a drop in port ordered to the specs you guys could provide.
Mr Focht- Yes it does have a sub-sonic filter, and I'm not sure the dims of the box. Are those needed? Thanks!
because for the most part on this subject he's pretty right on. a properly built and tuned ported enclosure will sound just as accurate as a sealed box can. most people just assumed sealed is pure sq and ported is pure spl. and allot of peoples refrences are based off of there friends and buddies who just built ported boxes to boom and not actually sound good. granted not all people are that way, but id bet a good 80% are. hell give me a good 30 band or more eq an rta and a sealed and a ported box and i could probaly get the two sounding almost the same.
when dealing with ported i'd personally build a new box to specs versus trying to convert a sealed box over. you have to be accurate when building ported, where as sealed you have a big window to work with on sizing.
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sndsgood wrote:when dealing with ported i'd personally build a new box to specs versus trying to convert a sealed box over. you have to be accurate when building ported, where as sealed you have a big window to work with on sizing.
This is probably the way we will go. I was just seeing if anyone had the capability of calculating the specs to see if we could get lucky as use an existing box. I appreciate the help. Thanks!
we can do it, we just need the dimensions of the box in question...
click sig for my car audio videos
10.75" x 12.75" x 10.75"
The face of the box with the subwoofer mounting hole is 12.75 wide and 10.75 high. The mounting hole is centered.
Just do an external port if youre going to do it. Since sealed is going to be undersized you wont want it inside eating up more space.
How is it too small? It's 0.9 cu ft and it calls for a ported box volume of 0.75 cu ft...
SEC-Z wrote:How is it too small? It's 0.9 cu ft and it calls for a ported box volume of 0.75 cu ft...
Porting takes away from air space. Gross itll be .9 cu ft. Net will be less and net is what matters.
as well as the sub itself eating up air space inside.
Weebel wrote:Im to smart to go to strip clubs.
Anyone worked on the port dims yet to see if the .9 would work? He could invert the woofer if needed!
Yes internal dimensions were given. the air space is .9 cu ft without factoring in the sub woofer displacement (.068 cu ft). It was mentioned to me that neither box would be large enough, so I threw out the idea of inverting the woofer.
