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06-23-2010, 08:35 AM
| | Registered User
Use of this field for any other purpose is prohibited | | Join Date: Dec 2008 Location: Cugy (VD), Suisse | | | Pressurized speaker cabinet.
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Hi all,
I am seriously considering buying a pressurized speaker cabinet. A Burman 4x12 to be precise. Now, I know nothing about the why and how of pressurized cabs but what would happen if I take a speaker out? Is the whole effect that comes from pressurizing ruined then?
I do not plan to take a unit out but I do not know if someone else has or what would happen if I ever have to change units.
Thanks. |
06-23-2010, 08:42 AM
| | Registered User
Use of this field for any other purpose is prohibited | | Join Date: Dec 2008 Location: Cugy (VD), Suisse | | Pardon, I mean pressuri sed...
Btw, it was mentioned here, the fact that the cabinet is pressurised: http://www.burmanamps.fsnet.co.uk/reviews/pro4000.html |
06-23-2010, 08:47 AM
|  | Registered User | | Join Date: May 2009 Location: Los Angeles | | | I've never heard of it , sounds like a wee bit of marketing mojo/hype in there at first glance , but if it sounds good go for it . |
06-23-2010, 08:51 AM
| | Registered User | | Join Date: Sep 2008 Location: Sioux Falls, SD | | | Pressurized? How about a sealed cabinet...
There's this schrader valve on the side, we get really tight bass by cranking it up to 180 PSI inside.
BAM, the cones look like Madonna's new bra...
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06-23-2010, 08:53 AM
| | Registered User
Use of this field for any other purpose is prohibited | | Join Date: Dec 2008 Location: Cugy (VD), Suisse | | | Thing is, if I buy it it has to cross the Swiss border. I can see how customs might think of it as a large container for illegal substances and would want to take a look inside.... |
06-23-2010, 08:54 AM
|  | Registered User | | Join Date: Feb 2005 Location: Seweracuse, NY | | | I agree. It sounds like an awesomely unnecessary feature.
That article is pretty silly too. I liked the part about how heavy both the head and cab are, and that the cab handled the awesome 100w power of the head without a problem.
__________________ fEARful: for those who want something better: http://greenboy.us/fEARful/ For Sale (locally only): Bergantino HT115 with Cover: $500.00. PM me about it.
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06-23-2010, 08:55 AM
| | Registered User
Use of this field for any other purpose is prohibited | | Join Date: Dec 2008 Location: Cugy (VD), Suisse | | Quote:
Originally Posted by rbonner  Pressurized? How about a sealed cabinet...
There's this schrader valve on the side, we get really tight bass by cranking it up to 180 PSI inside.
BAM, the cones look like Madonna's new bra... | Hahaha!!!
A lot of bull you say? It does seem unlikely now you mentioned Maddie's bra.... |
06-23-2010, 08:57 AM
| | Registered User
Use of this field for any other purpose is prohibited | | Join Date: Dec 2008 Location: Cugy (VD), Suisse | | Quote:
Originally Posted by BurningSkies I agree. It sounds like an awesomely unnecessary feature.
That article is pretty silly too. I liked the part about how heavy both the head and cab are, and that the cab handled the awesome 100w power of the head without a problem. | Ok, you're right. That does it, pressurised really means sealed.
Thanks guys! |
06-23-2010, 08:57 AM
| | Registered User | | Join Date: May 2009 Location: Los Angeles | | I can't wait for the experts to chime in , I feel stupid on this one  , but how can a paper speaker cone remain air tight , and how is the speaker cable input air tight , is it infact air tight or just simply sealed like rbonner said and which case it would probably pressurize when pumping out some SPL's |
06-23-2010, 08:58 AM
| | Registered User | | Join Date: Nov 2007 Location: Cleveland, TN | | | My guess would be sealed.
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06-23-2010, 08:59 AM
| | Registered User | | Join Date: Jan 2006 Location: Brookfield, CT | | | It's just sealed instead of ported- that's what the writer meant by 'pressurized.' There's no point, or way, to pressurize a cab. |
06-23-2010, 09:01 AM
|  | One lab accident away from being a supervillain | | Join Date: Aug 2006 Location: Powder Springs, Ga | | Sounds like a gimmick to me. What is the internal pressure? How does that make the cabinet work better? What happens if you lose pressure (as you certainly will at some point)? Quote:
Originally Posted by rbonner There's this schrader valve on the side, we get really tight bass by cranking it up to 180 PSI inside. | I think a Presta valve would be better suited to this application 
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06-23-2010, 09:25 AM
| | Registered User | | Join Date: Feb 2005 Location: Seweracuse, NY | | Quote:
Originally Posted by fretno I can't wait for the experts to chime in , I feel stupid on this one , but how can a paper speaker cone remain air tight , and how is the speaker cable input air tight , is it infact air tight or just simply sealed like rbonner said and which case it would probably pressurize when pumping out some SPL's | Well, no one wants a whistling jack-hole.
But that said, and I say it frequently...you CAN come close to a sealed input. For my cabinets I used those nice Neutrik jacks that are about 90% sealed. From there, once wired up, I used heat shrink around the jack and wiring, then used silicon both inside the shrink and outside to seal the jacks. Entirely possible.
__________________ fEARful: for those who want something better: http://greenboy.us/fEARful/ For Sale (locally only): Bergantino HT115 with Cover: $500.00. PM me about it.
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06-23-2010, 09:28 AM
| | Registered User | | Join Date: May 2009 Location: Los Angeles | | "whistling jack-hole" future band name ?  |
06-23-2010, 09:31 AM
| | Registered User | | Join Date: Feb 2005 Location: Seweracuse, NY | | Quote:
Originally Posted by fretno "whistling jack-hole" future band name ? | I've already laid claim to it as a band name...It's going to be my next side project.
I've actually taken to calling various people 'whistling jack-holes' from time to time. Long before it was a build concern for me, my girlfriend and I used jackhole as a PG rated way of cursing someone in the car.
__________________ fEARful: for those who want something better: http://greenboy.us/fEARful/ For Sale (locally only): Bergantino HT115 with Cover: $500.00. PM me about it.
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06-23-2010, 09:33 AM
| | Registered User | | Join Date: May 2009 Location: Los Angeles | | Quote:
Originally Posted by BurningSkies I've already laid claim to it as a band name...It's going to be my next side project.
I've actually taken to calling various people 'whistling jack-holes' from time to time. Long before it was a build concern for me, my girlfriend and I used jackhole as a PG rated way of cursing someone in the car. | you guys should mic your jack holes at the sessions . |
06-23-2010, 09:52 AM
|  | Registered User | | Join Date: Aug 2007 Location: Toronto Ontario Canada | | | It's possible that they are referring to their bracing stressing the panels. That's all that makes sense to me.
Paul |
06-23-2010, 02:05 PM
| | Registered User | | Join Date: Sep 2008 Location: Sioux Falls, SD | | Quote:
Originally Posted by PSPookie Sounds like a gimmick to me. What is the internal pressure? How does that make the cabinet work better? What happens if you lose pressure (as you certainly will at some point)?
I think a Presta valve would be better suited to this application | However with a Presta you cannot remove the core to pour in leak patching fluids... 
I'm sure a nitrogen flill would result in neutral sonic boyancy and constant pressure through -20 to +120 degree operating conditions.
Reminds me of a story. Back when I was a flight instructor building hours. I walked in the maintenance hanger and my buddy the mechanic was just completing the rebuild of a nose strut on a Piper Cherokee.
He had the nitrogen bottle out, it was summer... I asked him why the nitrogen. It is temp neutral and the strut will stay inflated in the coldest of winters. BUt gee, its 90 degrees out, waste the nitrogen when winter comes.
He's sitting there with 1000PSI in the bottle and the strut takes about 15PSI
NO REGULATOR.
Turns knob, goes to far, strut goes full up, seals blow out everywhere and nose crashes down....
Maybe I should have used the air hose.
Madonna all over...
Pressurized means sealed... No extra air.
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"THE ABILITY TO DESTROY A PLANET IS INSIGNIFICANT NEXT TO THE POWER OF THE FORCE."
Last edited by rbonner : 06-23-2010 at 02:07 PM.
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06-23-2010, 02:13 PM
|  | Registered Bass Offender | | Join Date: Nov 2007 Location: Cambria, CA (Central Coast) | | | Fill the cab with helium to make it lighter.
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06-23-2010, 02:28 PM
|  | double parked
Endorsing Artist: Dark Horse strings | | Join Date: Oct 2009 Location: Verde Valley, AZ | | Quote:
Originally Posted by Rick Auricchio Fill the cab with helium to make it lighter. | Personally, I pressurize my cabs with dry nitrogen. I tried helium but they always sounded like munchkins.
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Chuck
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