'LGT' Construction Diary

[sq225917]

you go!

[ShinOBIWAN]

Originally posted by sq225917
you go!

Shut it, before I slap ya

[Salas]

Originally posted by ShinOBIWAN


Opps. I better not show the surrounds I've done as well.

Since you are trying to do to the international DIY community what Clouseau did to Dreyfus nerves with your relentless production of impeccable masterpieces, here is what I am thinking to build next. Any suggestions about the finish?

[ScottG]

Originally posted by ShinOBIWAN
Bored, need some outlet so I thought why not look into a center channel design as a distraction.

-top right column.

[Grumpy_Git]

Bottom middle would be the best match for the LGT's. IMO


Nick.

PS: Are you taking orders yet?

[BerntR]

Since the subject of room treatment was brought up, I thought maybe the listening room of Stig-Erik Tangen might be interesting.

He has been deep into speaker building and acoustic treatment and recording for a long time. And to call it a listening room is an understatement since he has set up a dedicated building.

http://member.newsguy.com/~stigerik/...surements.html

His speaker building projects are also very interesting material.

[stryker1959]

Originally posted by ShinOBIWAN


Opps. I better not show the surrounds I've done as well.

You can't have those mains and a center channel without surround to match



Ya taking orders yet shin?

[ShinOBIWAN]

Excellent link Bernt, thanks for that. Impresive work on all levels, I particularly like how he uses console with Waves plugins for loudspeaker DSP - something I was/am very fond of myself. His room treatments and listening space are something to aspire to especially considering the importance these make to sound reproduction. Clearly the guy is dedicated.

Is he a member on here?

BTW I thought the name Stig-Erik Tangen rang a bell and I was pleased to see I wasn't imagining it when I discovered the 'Almighty' subs. If I'd get the space in my little listening room then I'd definitely be looking at something like that, sadly as it stands I'm already sat on top of the LGT's when listening to them! Well almost

[ShinOBIWAN]

Originally posted by stryker1959



You can't have those mains and a center channel without surround to match



Ya taking orders yet shin?

I know, for the surround design I've got in mind its looking unreasonably expensive considering their multichannel only use.

I find the M&K tripole designs to work well for the duties of a surround speaker so naturally I followed form. But to have a 'matched' design with the LGT then I'd have to go with RAAL and Audiotechnology drivers. Bear with me here, I'm always long winded in everything I do including explanations for my motives

Soooo that means a couple of possibilities such as:

3x RAAL's and an AT(prob 6.5")
1x RAAL and 3x AT's

The price, in drivers, for the surrounds wouldn't be a million miles off that of the mains which is daft considering their much lesser role. Or maybe just do a monopole design with a single tweeter and mid/bass? These never seem to work well regarding ambience on movie track, at least when compared to the alternatives such as those tripoles I mentioned.

Much better would be dome tweeter and some Seas poly cones so as not to leave a bitter taste in the bank managers mouth. But boy what a cop out!

Another interesting point is that with the console setup I use its possible to add effect plugins into the loudspeaker DSP. These can take the form of stereo expanders, multichannel steering processors as well as more basic reverbs, delays and such like. Of course these are useless, not to mention detrimental, for 2 channel stereo playback but for a surround speaker doing movies? I bet some interesting if not entirely natural effects can be produced.

PS. Website will be up shortly to take orders on the LGT, LGT-C and LGT-SR. Payment via Western Union only please

[ShinOBIWAN]

Originally posted by ScottG


-top right column.

Originally posted by Grumpy_Git
Bottom middle would be the best match for the LGT's. IMO


Nick.

PS: Are you taking orders yet?

Those two are the ones that I prefer. The only difference between them is the aesthetics of the baffle insert - one rounded one more angular.

The overall design is 3x AT 5" mid/woofers with the smaller RAAL 70-10 ribbon.

I'm not sure about crossover specifics, I'd like to suggest that identical one to the LGT's would be best but I suspect that might be short sighted.

If that was to be the case then a 3 way with crossover points at 200hz and 2.5Khz would be the choice. The two flanking 5" mids doing from about 70hz-200hz with the vertical mid-tweeter running from there on up.

However possibly more wise might be running 2.5way with all three 5" mids running upto 200hz but with the exception of the center 5" which carries on upto 2.5Khz and hands over to the RAAL. My reasoning being slightly more headroom in the bass but possibily at the expense of some mid clarity related IMD from asking the mid driver to also do bass.

I think because of its heavy vocal nature a center speaker should have more presence in the vocal range so 150hz - 800hz should be optimised and perhaps even boosted for great clarity.

I don't think wads of bass is needed so the 5" drivers should be OK, althought it might be better to slightly modify the design to allow the flanking woofers to be the 6.5" variety for a little more weight during on screen effects which a center speakers is often asked to play.

If anyone has a random thought they'd like to add please do so! This will be my first center and whilst I think I know what needs to be done I'm probably missing some important points.