Line Array Project

SteveNarayan · 29th December 2006, 07:18 AM

I recently had the good fortune to pick up a slightly used Newform R630 kit (2 30" ribbon, 2 18W/8545 woofers) that hasn't been put together yet. A friend and I are going to build a 4-6 woofer array using one or two NFR ribbons per channel. Plan right now is to have the overall height to 60" and incorporate 4 woofers, spaced 180mm ctc. The ribbons will be positioned to the side similar to Brad Virgils original R45 ribbons in the Excelarray. I've ordered 6 more 18W-8545 drivers (total Cool from Solen for this project. I may add 4 more woofers if necessary but would like to take a modular approach before adding the extra 2 per channel, is this feasible or would it be better to build the project from the start using 6 mids/channel.

With 4 8545 and 1 R30 per side nominal impedance will be 8Ohms but there will be an efficiency mismatch from my calculations. 6 mids and a pair of R30's per channel give a lower nominal load and a 94dB sensitivity match if my calculations are right.

I've been diligently reading Dr. Griffin's Nearfield Array white paper the last week and any help would be appreciated.

ears4hire58 · 2nd January 2007, 06:15 AM

A 30" ribbon will have a very narrow vert. beam at HF. So get the height right.

otto88 · 13th March 2008, 11:25 PM

How did you go, in particular, how do the Newform ribbons sound?

Are you able you compare to Apogee or other ribbons?

Thanks

SteveNarayan · 14th March 2008, 04:36 AM

Never completed the project actually. In fact never got started. I still might someday if I can find the space again to do it.

otto88 · 14th March 2008, 05:18 AM

I've had the same problem, a dedicated workspace is almost essential . .

29th December 2006, 07:18 AM	#1
SteveNarayan diyAudio Member Join Date: Dec 2006	Line Array Project I recently had the good fortune to pick up a slightly used Newform R630 kit (2 30" ribbon, 2 18W/8545 woofers) that hasn't been put together yet. A friend and I are going to build a 4-6 woofer array using one or two NFR ribbons per channel. Plan right now is to have the overall height to 60" and incorporate 4 woofers, spaced 180mm ctc. The ribbons will be positioned to the side similar to Brad Virgils original R45 ribbons in the Excelarray. I've ordered 6 more 18W-8545 drivers (total Cool from Solen for this project. I may add 4 more woofers if necessary but would like to take a modular approach before adding the extra 2 per channel, is this feasible or would it be better to build the project from the start using 6 mids/channel. With 4 8545 and 1 R30 per side nominal impedance will be 8Ohms but there will be an efficiency mismatch from my calculations. 6 mids and a pair of R30's per channel give a lower nominal load and a 94dB sensitivity match if my calculations are right. I've been diligently reading Dr. Griffin's Nearfield Array white paper the last week and any help would be appreciated.

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2nd January 2007, 06:15 AM	#2
ears4hire58 diyAudio Member Join Date: Dec 2006 Location: So. California	A 30" ribbon will have a very narrow vert. beam at HF. So get the height right.

13th March 2008, 11:25 PM	#3
otto88 diyAudio Member Join Date: Dec 2007	How did you go, in particular, how do the Newform ribbons sound? Are you able you compare to Apogee or other ribbons? Thanks

14th March 2008, 04:36 AM	#4
SteveNarayan diyAudio Member Join Date: Dec 2006	Never completed the project actually. In fact never got started. I still might someday if I can find the space again to do it.

14th March 2008, 05:18 AM	#5
otto88 diyAudio Member Join Date: Dec 2007	I've had the same problem, a dedicated workspace is almost essential . .

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