6th Order bandpass build |
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deepss
Registered User Joined: 15 April 2009 Location: Cornwall Status: Offline Points: 82 |
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and maybe move the side ports away from the side or the cab. The wadding is virtualy touching them. Dont know exactly how much difference it would make,just seems a sensible thing to do.
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doober
Young Croc Joined: 03 January 2006 Location: Cornwall UK Status: Offline Points: 1118 |
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Having heard this cab I can say it does sound great. It sounds very smooth and goes hideously low, we managed to find those low notes on Avril Lavignes 'sk8r boi' (I had previously thought that was a wind up- apologies to whoever suggested that tune!). It moves some serious amounts of air.
I won't bother posting the plots we did as they were not in a suitable environment and could be well out. The interesting thing about the plots is the very steep notch at around 38hz, this is hopefully a function of the building we were in. We definitely need to try some more plots outside. The waterfall plot revealed some odd behaviour around this area. The other measurements were impedance plots with LIMP to check the tuning frequencies were as planned. The lower ports were a couple of hz lower than predicted, no big issue really, could be due to the ends being close to the sides of the box. The front chamber was tuned way too low with the longer port, and ended up needing to be around a quarter of the predicted length- again the interaction with the top and bottom panels probably caused this. I had originally thought the dip at 38hz could be due to the front chamber being tuned too low. It would seem logical to me that if the tunings are too close there will be a cancellation at a point halfway between them as surely the two sets of ports radiate sound of opposite phase? I could be quite wrong here. Get it stuck back together and we'll have a go with it outside. Kieran |
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Blahblahblah
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axeman91
Registered User Joined: 24 May 2007 Status: Offline Points: 249 |
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Looks mean! How would it compare to an X1?
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deepss
Registered User Joined: 15 April 2009 Location: Cornwall Status: Offline Points: 82 |
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Hmmmm...Lets not go there with that question! At the mo,its still work in progress. The thought of comparing it with anything is still a ways off. I am still new to this game so the chances of it all going to plan on this first attempt is a total long shot. But,more importantly,I'm learning heaps(slowly), and I'm totally enjoying myself.......and thats what its about for me just now
Cheers
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7810 |
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http://forum.speakerplans.com/x1-versus-b2_topic26788.html |
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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mstep77
Registered User Joined: 19 July 2006 Status: Offline Points: 457 |
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Very nice mate, looks wicked
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james folkes
Old Croc Joined: 08 January 2005 Location: United Kingdom Status: Offline Points: 3064 |
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amen to that, that's what this is all about... james.
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mardy hippy.
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wafflesomd
Young Croc Joined: 21 September 2007 Status: Offline Points: 811 |
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Cabinet looks sick. Wish I could hear em.
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deepss
Registered User Joined: 15 April 2009 Location: Cornwall Status: Offline Points: 82 |
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Just waiting for a break in the weather and then get it outside. See what it really does. We were going to have an attempt today,but the rain was blowing sideways.....again! So instead,spent the day in the workshop,blitzing it in the hope that this cabs got legs and I get to build a couple before Christmas. (Even managed to get festool gear sent off for servicing and new blades).....What ever happens,I'm gonna have to build something.......probably an ark.,(with ports of course)
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Gonzo-4-bidden
Registered User Joined: 01 June 2008 Status: Offline Points: 359 |
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great work, have you considered changing the mouth of the cab to an open mouth type horn instead of (the dual letterbox type design?) excuse my retarded terminology but im on a learning tip myself, noticed this http://srforums.prosoundweb.com/index.php/t/51159/0/on psw which is very similar, just wondering if the different horn mouth design could cure your low frequency dips around 37hz? please correct me if im well off as any education in this would be greatly appreciated! great work! |
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deepss
Registered User Joined: 15 April 2009 Location: Cornwall Status: Offline Points: 82 |
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Yep,we looked at that but not yet that advanced to work that out just yet. Still waiting for a decent test though. In the meantime,I've decided to build a couple of X1's. I figured it would be good to have a couple. Have materials,kit,empty(and now tidy)workshop,and time.Need to build something so keeping in flavour with things sub,why not,be good experience!
BTW,just spent past 15mins reading that link you sent. I'm not familiar with the prosoundweb forum. They get pretty heated over there!
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deepss
Registered User Joined: 15 April 2009 Location: Cornwall Status: Offline Points: 82 |
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So..... At last,got the chance to get it outside and test again!
The pic is really surreal,in fact it was really surreal doing that. Got some strange looks from the horsey folk..
Sorting out the plots now. Will post soon. (havin probs with photobucket )
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