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Old 11th April 2012, 09:20 PM   #1
Drumhead is offline Drumhead  Denmark
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Location: 55°42'56"N 12°19'55"E
Default Hello from Denmark

Hi everyone. I'm new to the forum. I thought I might as well sign up, since I've been browsing the site on and off for the last weeks. This seems to be the place where I get answers to all my questions about sound equipment. I've learned a lot already. Thanks for that!

Until recently I thought I lived happily in harmony with my 3 sets of Behringer Truth B2030A active studio monitors and B2092A active subwoofers. Then I happend to listen to a pair of 15" newly recoated Tannoy coax and fell for the wonderful dynamics and presence of such speakers.Wow! A snare drum sounded like, well - a snare drum. And felt like it, too.

So now I'm working on building a pair of 400 liter tuneable speaker cabinets for 15" P audio coax units (Tannoys are hard to get and expensive, so I chose those more or less at random for an alternative. Besides, they can take a lot more punishment - an important virtue IMHO). I'm also trying to fix my old Denon PMA 1560 Which suffers from old age and clics on and off with irregular intervals. I plan to bi-amp the system and try to use the Denon for treble/midtone and a Sure class-D amp for the bass. I may or may not even use the Behringer sub in conjunction with the new speakers. I'll see how it goes :-). I may post some photos and cabinet drawings once I get there (If my cabinets turns out to sound well).
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Old 11th April 2012, 09:54 PM   #2
planet10 is offline planet10  Canada
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Location: Victoria, BC, NA, Sol III
Hello from Denmark
Welcome to the forum.

community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
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Old 11th April 2012, 10:04 PM   #3
sreten is offline sreten  United Kingdom
Join Date: Nov 2003
Location: Brighton UK
Hi, 400L !? for a 15" ? what driver ? something is amiss ..., rgds, sreten.
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Old 11th April 2012, 11:12 PM   #4
c2cthomas is offline c2cthomas  United States
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Location: Near "Music City" (Nashville Tennessee)
Hello Drumhead -and Welcome to diyAudio!!!!
DIY audio can be expensive – but getting to see things go up in smoke - that's priceless!!!! ..... "whatever - call it brainfart of Mighty ZM"
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Old 12th April 2012, 02:54 PM   #5
Cal Weldon is offline Cal Weldon  Canada
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Location: Near Vancouver
Hello from Denmark
Hello Drumhead, welcome aboard.
Cal Weldon Consulting.
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Old 14th April 2012, 04:46 PM   #6
Drumhead is offline Drumhead  Denmark
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Join Date: Apr 2012
Location: 55°42'56"N 12°19'55"E
Default Thanks everybody

Originally Posted by sreten View Post
Hi, 400L !? for a 15" ? what driver ? something is amiss ..., rgds, sreten.
..for making me feel welcome.

sreten, it will be P-audio BM-15CX38 drivers. And the boxes are going to be something like what I have seen described as 'onken'-cabinets. The difference is that the slotted ports are shaped like little horns (approximately 10 mm wide openings inside and around 30 mm outside). There are a few geometric ratios that have to be kept fixed. The design is something a friend of mine has done a lot of experimenting with and they are supposedly scalable such that, to a certaint extent, bigger is better.

I have heard these boxes with Tannoy 15" Gold drivers (not sure exactly which model) and they sounded amazing. I make the slots adjustable with respect to the inner width of the openings so I can tune the boxes, realising that, eventhough the P-audio drivers come close to the Tannoys in many of their parameters, they are different after all. There are a number of reasons why I did not choose Tannoy drivers. First of all, availability and price. But also the fact that the P-audios can take a lot more punisment, which is important for me. Should they, contrary to my expectations, turn out to sound terrible as hifi-speakers I can always move them to my practice room, next to my drums, where they can make great monitors
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