Hi-vi B3s mounting

kenp3 · 14th October 2005, 02:42 PM

I'm thinking of building a line array using these drivers. My question is would it be ok to mount them on the back of the front baffle and round over the front edge or would it be best to flush mount them on the front of the baffle.

nerd of nerds · 15th October 2005, 03:11 PM

it seens like it would be much better to flush mount them on the baffle...

doing a roundover seems as though it would horn load the speaker slightly...

tade · 17th October 2005, 03:34 AM

what is with the elipses...

Horn loading would serve to increase the efficiency in a certain area? This would manifest itself as a hump in the response?

A good compromise might be to sink them into the baffle. Sounds like you have a router already. i flushmount because i use a jigsaw to make holes. Ugly holes. : )

by the way, i like these drivers. I have a pair of B4Ns and i abuse the hell out of them. Be careful with the coan though, i dropped a screwdriver on mine and sratched it a little bit.

bobhayes · 17th October 2005, 12:09 PM

The difference in response due to mounting the drivers on the back of the panel as opposed to the front would be negligible.
The peaks and troughs in the actual driver response (measured in an anechoic environment) would be far greater than any artifacts caused by the hole, especially if it's rounded over. Room acoustics make it even worse so I shouldn't worry about it.
Mount them flush if you think you can make a tidy job, if not then it won't make much difference to the sound if you mount them from the back.

kenp3 · 17th October 2005, 01:24 PM

Thanks for the responses. Another question would be how much will the efficiency of the drivers increase? These are rated at 81 db spl would this increase if say 10 drivers were run in series/parallel?

bobhayes · 18th October 2005, 03:02 AM

As far as I know, the sensitivity should be the same as for a single driver, however, line arrays will sound louder when further away compared to a single driver.

The reason is that a single point source SPL drops off at a rate of distance from the speaker to the power 3 because it fires in all directions.

A tall line array's SPL (floor to ceiling) will fall off at around distance to power 2. If you think about the sound eminating from the array, the row of speakers have to cover less volume per unit. Another benefit of this arrangement is an increased 'sweet spot'. I.e. the stereo image will be audible over a wider area than a point source, and you'll find them used in movie theatres.

A 'wall' array falls off even less (hence the popularity of four square guitar speakers). But these won't give a clear stereo image, so you don't see 'em used for hi fi.

Because of the 'projecting' nature of line arrays, you see them a lot in churches and conference halls etc.

Good luck with the project.

Jim Griffin · 18th October 2005, 04:33 AM

Try my white paper for details on line arrays. With N drivers arrayed you'll get 10 log (N) array gain or 10 dB for 10 drivers. The overall sensitivity would be 81 + 10 = 91 dB SPL. See the white paper for caveats and additional details.

Near Field Line Array White Paper

14th October 2005, 02:42 PM	#1
kenp3 diyAudio Member Join Date: Oct 2005	Hi-vi B3s mounting I'm thinking of building a line array using these drivers. My question is would it be ok to mount them on the back of the front baffle and round over the front edge or would it be best to flush mount them on the front of the baffle.

17th October 2005, 01:24 PM	#5
kenp3 diyAudio Member Join Date: Oct 2005	Something else I thought of Thanks for the responses. Another question would be how much will the efficiency of the drivers increase? These are rated at 81 db spl would this increase if say 10 drivers were run in series/parallel?

18th October 2005, 04:33 AM	#7
Jim Griffin diyAudio Member Join Date: Jun 2003 Location: Tennessee	Line Array Stuff Explained Try my white paper for details on line arrays. With N drivers arrayed you'll get 10 log (N) array gain or 10 dB for 10 drivers. The overall sensitivity would be 81 + 10 = 91 dB SPL. See the white paper for caveats and additional details. Near Field Line Array White Paper

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15th October 2005, 03:11 PM	#2
nerd of nerds diyAudio Member Join Date: Apr 2004 Location: U.S.A.	it seens like it would be much better to flush mount them on the baffle... doing a roundover seems as though it would horn load the speaker slightly...

17th October 2005, 03:34 AM	#3
tade diyAudio Member Join Date: Feb 2005 Location: Ralieigh nc	what is with the elipses... Horn loading would serve to increase the efficiency in a certain area? This would manifest itself as a hump in the response? A good compromise might be to sink them into the baffle. Sounds like you have a router already. i flushmount because i use a jigsaw to make holes. Ugly holes. : ) by the way, i like these drivers. I have a pair of B4Ns and i abuse the hell out of them. Be careful with the coan though, i dropped a screwdriver on mine and sratched it a little bit.

17th October 2005, 12:09 PM	#4
bobhayes diyAudio Member Join Date: Sep 2004 Location: Bungawalbyn, NSW	The difference in response due to mounting the drivers on the back of the panel as opposed to the front would be negligible. The peaks and troughs in the actual driver response (measured in an anechoic environment) would be far greater than any artifacts caused by the hole, especially if it's rounded over. Room acoustics make it even worse so I shouldn't worry about it. Mount them flush if you think you can make a tidy job, if not then it won't make much difference to the sound if you mount them from the back.

18th October 2005, 03:02 AM	#6
bobhayes diyAudio Member Join Date: Sep 2004 Location: Bungawalbyn, NSW	As far as I know, the sensitivity should be the same as for a single driver, however, line arrays will sound louder when further away compared to a single driver. The reason is that a single point source SPL drops off at a rate of distance from the speaker to the power 3 because it fires in all directions. A tall line array's SPL (floor to ceiling) will fall off at around distance to power 2. If you think about the sound eminating from the array, the row of speakers have to cover less volume per unit. Another benefit of this arrangement is an increased 'sweet spot'. I.e. the stereo image will be audible over a wider area than a point source, and you'll find them used in movie theatres. A 'wall' array falls off even less (hence the popularity of four square guitar speakers). But these won't give a clear stereo image, so you don't see 'em used for hi fi. Because of the 'projecting' nature of line arrays, you see them a lot in churches and conference halls etc. Good luck with the project.

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