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How many ports do you block on your SVS?


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24 replies to this topic

#1 of 25 OFFLINE   mitch

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Posted November 11 2007 - 06:10 AM

Hi all,

I'm still experimenting with my new SVS PB 12/Plus 2 sub and was wondering how many ports do most of you block to get the best balance of low frequency bass and output?

Right now, I'm blocking one port to get 20 Hz. and it sounds unbelievable! I'm going to experiment and block the other port to get it down to 16 Hz. to see what the effect is. I know that my output and upper lever bass may suffer, at least that's what my understanding is.

Please let me know what your experiences have been in blocking the ports and what effect it had as you made the changes. What did you wind up keeping your setting at?

Thanks as always,

Mitch

#2 of 25 OFFLINE   Barry_B_B

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Posted November 11 2007 - 07:12 AM

No ports blocked for me; I've had the 20-39PC Plus since July. For some reason it did not come with the port blockers (yes, I quadruple checked/searched the box), but I've been enjoying the default 20Mhz tune so much I've never gotten around to requesting the blockers. To go through my movie collection or TV programs and get that "I didn't know that was there!" sensation is a blast!

#3 of 25 OFFLINE   mitch

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Posted November 11 2007 - 08:15 AM

Barry,

If you contact SVS they would be happy to supply you with the port blockers. Speak with Eric. He is extremely helpful.

Mitch

#4 of 25 OFFLINE   Barry_B_B

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Posted November 11 2007 - 11:48 AM

Thanks Mitch, I need to do this; I was in church today when the pipe organ cut loose, 16Mhz is tempting Posted Image

#5 of 25 OFFLINE   BrianTwig

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Posted November 11 2007 - 12:39 PM

Have the PB12-NSD/2 and for music I block no ports, but for movies I block 2.
My budget system constrained by WAF

JVC HD-ILA HD-52G787
Panasonic DVD-S52K
Marantz SR5600Marantz CC4300NHT IW3s all aroundPureAV PF60SVS PB12-NSD/2

#6 of 25 OFFLINE   mitch

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Posted November 11 2007 - 12:54 PM

Brian,

When you block the two ports, do you lose any gain [volume] or high end bass? What is the biggest difference that you notice?

Thanks,

Mitch

#7 of 25 OFFLINE   Bertrand-R

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Posted November 11 2007 - 04:02 PM

When you block 1 or 2 ports do you need to recalibrate?

#8 of 25 OFFLINE   mitch

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Posted November 12 2007 - 12:01 AM

That's a good question Bertrand. I'll call Erik over at SVS today and find out.

Mitch

#9 of 25 OFFLINE   Robert_J

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Posted November 12 2007 - 12:58 AM

Two high excursion 12's and a single 4" port. If you do the math, a 4" port is barely enough area for a single 12 much less for two. I'm surprised that no one had heard any chuffing.

-Robert

#10 of 25 OFFLINE   Kevin C Brown

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Posted November 12 2007 - 12:27 PM

I go for the lowest extension. I've measured in my room, and I am -3 dB to 11 Hz with an Ultra/2. Most of us are probably nowhere close to volumes where you'd see any limited output with blocking both ports.
If it's not worth waiting until the last minute to do, then it's not worth doing.

KevinVision 7.1 ...

#11 of 25 OFFLINE   Shannon W

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Posted November 12 2007 - 04:41 PM

Blocked 2 for my PB12+2! 16hz all the way.

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#12 of 25 OFFLINE   Robb Roy

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Posted November 14 2007 - 12:59 AM

Quote:
Originally Posted by Bertrand-R
When you block 1 or 2 ports do you need to recalibrate?

Yes. You can, however, note your receiver's sub out level with each port setting so you can adjust without breaking out the meter each time. I.e., you would know -5 is for no ports blocked, -3 for one port blocked, 0 for two ports blocked (these numbers are just examples!).

-Robb

#13 of 25 OFFLINE   JohnRice

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Posted November 14 2007 - 03:28 AM

Quote:
Originally Posted by Barry_B_B
No ports blocked for me; I've had the 20-39PC Plus since July. For some reason it did not come with the port blockers (yes, I quadruple checked/searched the box), but I've been enjoying the default 20Mhz tune so much I've never gotten around to requesting the blockers. To go through my movie collection or TV programs and get that "I didn't know that was there!" sensation is a blast!

Barry, the cylinder subs have one set tuning, so no port blockers. I think that is one of the nice things about the SVS subs which have this feature. You can change the sound of the sub a bit, if only for a change.

The Hybrid System

The Music Part: Emotiva XSP-1, Thiel CS 3.6, Emotiva XPA-2, Marantz SA8004, Emotiva ERC-3, SVS PB-12 Plus 2

The Surround Part: Sherbourn PT-7030, Thiel SCS3, Emotiva XPA-5, Polk & Emotiva Surrounds.


#14 of 25 OFFLINE   Ben-S

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Posted November 14 2007 - 04:18 AM

Quote:
Originally Posted by Shannon W
Blocked 2 for my PB12+2! 16hz all the way.

Shannon
ditto for me baby!!

#15 of 25 OFFLINE   Robb Roy

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Posted November 14 2007 - 04:18 AM

Quote:
Originally Posted by JohnRice
Barry, the cylinder subs have one set tuning, so no port blockers.

The PCi cylinder subs do not have variable tuning, but the PC Plus line has three ports and variable tuning.

-Robb

#16 of 25 OFFLINE   JohnRice

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Posted November 14 2007 - 08:52 AM

Quote:
Originally Posted by Robb Roy
The PCi cylinder subs do not have variable tuning, but the PC Plus line has three ports and variable tuning.

-Robb
Oops

The Hybrid System

The Music Part: Emotiva XSP-1, Thiel CS 3.6, Emotiva XPA-2, Marantz SA8004, Emotiva ERC-3, SVS PB-12 Plus 2

The Surround Part: Sherbourn PT-7030, Thiel SCS3, Emotiva XPA-5, Polk & Emotiva Surrounds.


#17 of 25 OFFLINE   Barry_B_B

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Posted November 14 2007 - 08:59 AM

Quote:
Originally Posted by JohnRice
Oops

Posted Image

#18 of 25 OFFLINE   Robert_J

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Posted November 15 2007 - 03:09 AM

You can play with the tuning of the PC line as well. It just requires buying a new 4" flared port. Parts Express or Thriller Audio are great sources of the ports and port parts.

-Robert

#19 of 25 OFFLINE   BrianTwig

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Posted November 15 2007 - 07:43 AM

There is a slight loss of headroom, but the addition on the bottom end more than compensates in my opinion.

I notice that there is far more loss of volume and even bass when listening to music with 2 ports blocked. It just doesn't work. Especially since normal instruments do not go anywhere near teens in hz. If memory serves me right, an open E on a bass is 32hz.
My budget system constrained by WAF

JVC HD-ILA HD-52G787
Panasonic DVD-S52K
Marantz SR5600Marantz CC4300NHT IW3s all aroundPureAV PF60SVS PB12-NSD/2

#20 of 25 OFFLINE   Jeff_CusBlues

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Posted November 15 2007 - 11:34 PM

Quote:
Originally Posted by BrianTwig
There is a slight loss of headroom, but the addition on the bottom end more than compensates in my opinion.

I notice that there is far more loss of volume and even bass when listening to music with 2 ports blocked. It just doesn't work. Especially since normal instruments do not go anywhere near teens in hz. If memory serves me right, an open E on a bass is 32hz.

Pipe organs might go that low. I'm not sure about that though. If they do though, you might want to keep some TP close by. LOL


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