'LGT' Construction Diary - Page 128

Salas · 6th September 2007, 07:14 PM

450Hz 3dB per octave halving on your box, IMHO.

ShinOBIWAN · 6th September 2007, 07:17 PM

Quote:

Originally posted by salas
450Hz 3dB per octave halving on your box, IMHO.

How can that be? The baffles just aren't wide enough. Please explain more.

Salas · 6th September 2007, 07:24 PM

The baffles have a height and a sand clock expansion and you have a room too. Your plots show needing moderate BSC from 450Hz to my eye, nothing more. You will swamp the dynamics else, me thinks. Plus 4 are going to be at play and then the power response is going to go heavy. I would shape and use from 350Hz to 3500Hz. Vocal decade bliss.

pinkmouse · 6th September 2007, 07:52 PM

I'd guess about 600, but there's not much in it.

Wack lots of smoothing on the curve, it helps define trends like BS a lot easier.

ShinOBIWAN · 6th September 2007, 07:54 PM

Thanks chaps I'll update and post the results to see if it looks OK.

ShinOBIWAN · 6th September 2007, 08:08 PM

White is with the suggested baffle step and purple is without. Looks better. Thanks for that. Don't pay too much attention below 200hz because its not accurate.

Salas · 6th September 2007, 08:36 PM

Cool.

richie00boy · 6th September 2007, 09:03 PM

How do you do them plots? Vikash mic + pre and some software?

ShinOBIWAN · 6th September 2007, 11:17 PM

Quote:

Originally posted by richie00boy
How do you do them plots? Vikash mic + pre and some software?

Yes, that's pretty much it. You can either build your own mic and preamp or buy something cheap like the Behringer ECM8000 and MIC100 which should run to about £70-80. Plug the mic into the pre and the pre into your line in on the PC soundcard. Then its upto you regarding software, my favourite is ARTA and this was used to produce the plots I posted recently.

wigginjs · 7th September 2007, 12:12 AM

Shin:

You take your measurements indoors right? Do you do anything special with the placement of your speaker and microphone before measuring or do you just rely on the gating to clean everything up? About how long is your gate?

6th September 2007, 07:52 PM	#1274
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	I'd guess about 600, but there's not much in it. Wack lots of smoothing on the curve, it helps define trends like BS a lot easier. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

6th September 2007, 09:03 PM	#1278
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	How do you do them plots? Vikash mic + pre and some software? __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

7th September 2007, 12:12 AM	#1280
wigginjs diyAudio Member Join Date: Dec 2003 Location: Columbia, SC	Shin: You take your measurements indoors right? Do you do anything special with the placement of your speaker and microphone before measuring or do you just rely on the gating to clean everything up? About how long is your gate? __________________ The Four Chairs DIY Home Theater

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6th September 2007, 07:14 PM	#1271
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	450Hz 3dB per octave halving on your box, IMHO.

6th September 2007, 07:24 PM	#1273
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	The baffles have a height and a sand clock expansion and you have a room too. Your plots show needing moderate BSC from 450Hz to my eye, nothing more. You will swamp the dynamics else, me thinks. Plus 4 are going to be at play and then the power response is going to go heavy. I would shape and use from 350Hz to 3500Hz. Vocal decade bliss.

6th September 2007, 07:54 PM	#1275
ShinOBIWAN diyAudio Member Join Date: Feb 2004 Location: UK	Thanks chaps I'll update and post the results to see if it looks OK.

6th September 2007, 08:08 PM	#1276
ShinOBIWAN diyAudio Member Join Date: Feb 2004 Location: UK	White is with the suggested baffle step and purple is without. Looks better. Thanks for that. Don't pay too much attention below 200hz because its not accurate.

6th September 2007, 08:36 PM	#1277
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Cool.

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