Halair Column - my line array build (20 FR drivers) - Page 2 - diyAudio
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Old 23rd March 2014, 04:55 PM   #11
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Yep, an HTPC might fit the bill.

Also, using something like JRiver will give you access to a bunch of audio tweaks.
Should be easy enough to use as well.
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Old 23rd March 2014, 07:57 PM   #12
Halair is offline Halair  Norway
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Hehehe, if I were allowed to spend 6hrs without interruption for a whole week I am pretty sure most of the pair could have been done... But days like saturday are rare on my end so I had to use it appropriately :roll eyes: This build will take time however I am pleased with the progress so far Haven't had time to do more work since the image update, so don't hold your breaths for daily imagery updates... sorry
However, what I do hope to achieve during this week is to have the main part of one cabinet glued...lets hope I didn't jinx myself there hahaha

My current front speakers use 4 of the 5 channels from my amp, not sure if IŽll go that route with these. If I use regular two channels its simple, perhaps 125W/speaker is adequate. Optionally wire two groups of 10 per speaker, feeding each tower 2x125... What would you do?

Media PC / Jriver is most likely not gonna be an option, wifey and kids need to "press this button" to use the room, they will not be bothered with additional hardware.... go figure...
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Old 24th March 2014, 05:50 AM   #13
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Well, once set up (and turned on), the media PC would be one click for choosing the movie to be played. Should be simple enough! Things like cover flow makes choosing a movie the same as choose a book on a shelf.
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Old 24th March 2014, 10:21 AM   #14
Halair is offline Halair  Norway
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No further work have been done since last image update but here is a couple more with additional information added:

One of my concerns regarding a long line of identical drivers was to have them line up perfectly. In a long line the odd one will always stick out! Since I do not have a 2000x500mm CNC.machine in my garage I had to resort to low tech solutions...

After the front baffle was cut to correct width I scribed a thin line down the middle, used an aluminum straightedge and then a smaller aluminum ruler to pinpoint the 85mm center-center spacing. These were then predrilled with a 1,5mm drill bit (~1/16")
Once that was done the 76mm (3") holes were done. This worked out pretty well
The subsequent loose fit of all 20 units showed excellent uniformity and with the long straightedge tapped gently on the side of the drivers they lined up perfectly. At that point the mounting holes were marked and drilled once the drivers were removed.

Last picture again show size comparison vs the B&W DM604 (height =1m)
The Column isnt gluet yet, just resting up against the wall.

I have formed an idea of pedal/base for the Columns, since the base of the cabinet do not hold drivers (about 20cm / 8" high" I can use this space to fine tune baffle volume in neccesary and use concrete starting say 15cm / 6" high, going down past the bottom of the sides into a wider base. This would be cast as one piece. This will add great weight to the base making the structure a lot more stable. Total height of the base incl. spikes would be 7-8cm (+3") Added weight could be as much as 20-30kg (45-75lbs)
On the negative side since this would be a added part of the structure, making it more difficult to handle if required to be moved about. Option #2 would be to make it a separate module where the cabinet bolt onto. This again would need the sides/front/rear baffle to be reinforced to cope with bending forces... Love to create/find solutions...
Attached Images
File Type: jpg Baffle center.JPG (487.0 KB, 616 views)
File Type: jpg Size.JPG (459.7 KB, 596 views)
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Old 24th March 2014, 11:28 AM   #15
Halair is offline Halair  Norway
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Quote:
Originally Posted by wesayso View Post
I love the idea of using the Cornu's for rear duty. Diffuse enough for the purpose perhaps.
I have B&W DM601's on that job today but its an entertaining idea to use 4 Columns + one vertical Column for a complete 5-channel. I have researched LA as center but found very little however Adyton market a LA center speaker identical to their Imagic-series... In my world that would equal 100x Vifa TC9's

Have no idea how viable this would be though... but I like the idea
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Old 24th March 2014, 11:32 AM   #16
Halair is offline Halair  Norway
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Quote:
Originally Posted by xrk971 View Post
Halair,
Hey, where is your Cornu being hung to test? You might want the two tower LA to be main L & R channel and wall mount Cornus for rear L&R duties.
Right now its standing (only have one completed) on a pedistal up against a glass wall facing a very large room. Listening position is 6m / 20' away so far from ideal I know
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Old 24th March 2014, 11:46 AM   #17
Halair is offline Halair  Norway
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Default 2x 125W or 4x 125W?

Question - I have 4x 125W max available for the front speakers, should I use 2x125W amp for the pair or should I split each Column in 2x10 groups and feed each group with its own amp channel?

More is usually better but LA's are very power efficient so would the extra available power be an addition or a unneccesary distraction?
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Old 24th March 2014, 12:12 PM   #18
xrk971 is offline xrk971  United States
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I recall Roger Russell recommending an amp with 350 watts headroom for a 25 driver array of Vifa's. 250 watts is probably enough for 20 drivers. I would go with 2 channels to 10 drivers.
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Old 24th March 2014, 12:21 PM   #19
wesayso is offline wesayso  Netherlands
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I assume you can't bridge the 4 channels to two and make more power?
Personally I wouldn't be inclined to split the columns into two sections in a floor to ceiling line array but it could provide more power. You are planning to run separate subs right? If you are, the 2x 125 watt would be enough power. The EQ needed if you plan on running the lines full range would demand the most power and maybe it would be an idea to use all 4 channels in that case.
Do watch the x-max limit on the Vifa's though if you decide to go full range. That's why I don't plan to extend all the way down to 20 Hz, I'll try 30 Hz to be save first and roll off from there and hope the close to the wall boundary gives me some extension below 30 Hz.

Last edited by wesayso; 24th March 2014 at 12:28 PM.
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Old 24th March 2014, 01:28 PM   #20
Halair is offline Halair  Norway
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Correct, bridging isnt an option. I have no qualms using 4 input ports for each speaker. More power it is Should I upgrade later to a different say 2-channel amp big enough for the job I can always reconnect the two groups into one.

Separate subs in time is the plan yes, however no immideately plan getting startet that yet hehe
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