Need Port Advice (not wine)
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Edgecrusher
Well-known member
Re: Need Port Advice (not wine)
Its not tuned those slots wont vibrate and wont push air. It wont have any different effect than having an open back cab would. In fact it would probably even make it worse for projection.
Its not tuned those slots wont vibrate and wont push air. It wont have any different effect than having an open back cab would. In fact it would probably even make it worse for projection.
Re: Need Port Advice (not wine)
Edgecrusher -
Sounds like either a an open back like a blues jr., or go take an online class on the subject. Nobody seems to say HOW to tune a cab. So it is starting to go negative, with uOpt saying "ports cause canceled freq. is bats**t crazy,don't have time for math"- after admitting I have no idea, you say "I ain't getting what you are putting down" is true, but still comes off as an insult to me. especially since I asked for help. Then you criticizing Dr. N. - still not telling me how to port cabs, and if you can't tell, why criticize me me for it. Apparently that is a big theme, so this is going nowhere.
I truly thank all of you who tried to help. But this is turning into an argument, getting negative. Will lock thread later today, so if anyone wants to put in some "Positive Feedback" first, please do. Negative comments please keep to yourself out of respect for the Duncan Forum and those who do get help here, as I have many times. Edgecrusher, with all due respect, you seem to go negative whenever you jump into any of my posts. It seems personal, but maybe that's just you and your personality, I cannot tell without knowing you personally.
For me, I will look up dystrust's cabs and look at the cabs and how they seem to be arranged by size, placement, and speaker size and power. Then look for other sources.
SJB
Edgecrusher -
Sounds like either a an open back like a blues jr., or go take an online class on the subject. Nobody seems to say HOW to tune a cab. So it is starting to go negative, with uOpt saying "ports cause canceled freq. is bats**t crazy,don't have time for math"- after admitting I have no idea, you say "I ain't getting what you are putting down" is true, but still comes off as an insult to me. especially since I asked for help. Then you criticizing Dr. N. - still not telling me how to port cabs, and if you can't tell, why criticize me me for it. Apparently that is a big theme, so this is going nowhere.
I truly thank all of you who tried to help. But this is turning into an argument, getting negative. Will lock thread later today, so if anyone wants to put in some "Positive Feedback" first, please do. Negative comments please keep to yourself out of respect for the Duncan Forum and those who do get help here, as I have many times. Edgecrusher, with all due respect, you seem to go negative whenever you jump into any of my posts. It seems personal, but maybe that's just you and your personality, I cannot tell without knowing you personally.
For me, I will look up dystrust's cabs and look at the cabs and how they seem to be arranged by size, placement, and speaker size and power. Then look for other sources.
SJB
Securb
One of Jerry's Kids
Re: Need Port Advice (not wine)
I am getting ready to build a 2x15. I talked to someone at Celestion about porting the cab and the answer was.
No warnings about phase cancellation
I am getting ready to build a 2x15. I talked to someone at Celestion about porting the cab and the answer was.
No warnings about phase cancellation
Re: Need Port Advice (not wine)
Thanks Securb.
Good info. You are always helpful. I am still going to find the "Math" or "By the thumb" best way to port. Again, thanks to all the helpful and positive posts. uOpt is always helpful and I can see why he said what he did. I don't consider him in any way negative. Just reacting to what I said about certain posts. See next sentence.
I wish I never brought up phase cancellation. Led to post 15 and 22, which introduced negative aspect of thread. If you are going to bash someone, then offer a fix!
SJB
Thanks Securb.
Good info. You are always helpful. I am still going to find the "Math" or "By the thumb" best way to port. Again, thanks to all the helpful and positive posts. uOpt is always helpful and I can see why he said what he did. I don't consider him in any way negative. Just reacting to what I said about certain posts. See next sentence.
I wish I never brought up phase cancellation. Led to post 15 and 22, which introduced negative aspect of thread. If you are going to bash someone, then offer a fix!
SJB
Last edited:
Edgecrusher
Well-known member
Re: Need Port Advice (not wine)
I said you werent picking up what i was putting down because you werent understanding me... and i still dotn think you are. I explained before porting wont do what you want it to. Thats why didnt tell you how to do it. It wont fix the problem so why explain the process? What newc is trying to get you to do is NOT porting and wont do anything different than an open back cab.
Porting relies on a precise relationship between the driver, the size and shape of the box and the size and shape of the port. The odds that your box is already at the perfect size for your speaker are close to nil. If you want a port that works well it needs to be designed with the box from the get go.
If you really want to learn how a box is ported you need to start at square one. Ive never seen a box that was sealed and converted to ported that worked well.
I said you werent picking up what i was putting down because you werent understanding me... and i still dotn think you are. I explained before porting wont do what you want it to. Thats why didnt tell you how to do it. It wont fix the problem so why explain the process? What newc is trying to get you to do is NOT porting and wont do anything different than an open back cab.
Porting relies on a precise relationship between the driver, the size and shape of the box and the size and shape of the port. The odds that your box is already at the perfect size for your speaker are close to nil. If you want a port that works well it needs to be designed with the box from the get go.
If you really want to learn how a box is ported you need to start at square one. Ive never seen a box that was sealed and converted to ported that worked well.
Myaccount876
Amira-Maker
Re: Need Port Advice (not wine)
I think you're already at a huge disadvantage because your cabinet enclosure is a literal cube - all dimensions are equal. "Safe" dimensions usually follow a ratio of 1:1.6, 1:1.2, 1:1.26, or 1:618 to avoid standing waves and make sure different parts of the cabinet resonate at different frequencies. With cube dimensions, every part of the cabinet resonates at the same frequency. This is exactly why most cabinet designers/builders don't make cubes. Honestly, I don't there's any real "fixes" for the cabinet in question and you just have to make due with it.
I think you're already at a huge disadvantage because your cabinet enclosure is a literal cube - all dimensions are equal. "Safe" dimensions usually follow a ratio of 1:1.6, 1:1.2, 1:1.26, or 1:618 to avoid standing waves and make sure different parts of the cabinet resonate at different frequencies. With cube dimensions, every part of the cabinet resonates at the same frequency. This is exactly why most cabinet designers/builders don't make cubes. Honestly, I don't there's any real "fixes" for the cabinet in question and you just have to make due with it.
Re: Need Port Advice (not wine)
Edgecrusher, Myaccount-
To bad those measured relationships hadn't come up before. Thanks Myaccount, that is a very good reason and solid explanation for why my cab in particular has been such a tough one.
Guess I'll, for the time being, put my V30 in my open backed Blues Jr.3 and call it good. I know it can fit, just a little tight though so I know it will work. Thank you everyone.
Time to nail this one shut!
SJB
Edgecrusher, Myaccount-
To bad those measured relationships hadn't come up before. Thanks Myaccount, that is a very good reason and solid explanation for why my cab in particular has been such a tough one.
Guess I'll, for the time being, put my V30 in my open backed Blues Jr.3 and call it good. I know it can fit, just a little tight though so I know it will work. Thank you everyone.
Time to nail this one shut!
SJB
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