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8" Active Studio Monitor

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mini-mad View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mini-mad Quote  Post ReplyReply Direct Link To This Post Posted: 14 October 2018 at 4:21pm
...the Mrs doesn't look to impressed.... prob the fact you unplugged her dishwasher to test them!!


If it sounds like a gorilla is trying to escape, turn it down.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vertx Quote  Post ReplyReply Direct Link To This Post Posted: 16 October 2018 at 11:54am
This is the response, no smoothing, at I guess 4pi ? Some EQ adjustments made, and I'm confident there's still loads of room for improvement.

Measured on back facing sky, about 1m off the ground on milk crates. The 5db drop off in low end flattens out quite nicely in the small studio. When the high pass is down around 20hz there is a surprising amount of low pressure (current settings have it at 30hz high pass)



This is the seperate woofer/tweeter response, and then the overall sum after alignment. Electrical crossover at 2.1khz, acoustic crossover at 2.2khz:




Edited by vertx - 16 October 2018 at 12:03pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vertx Quote  Post ReplyReply Direct Link To This Post Posted: 16 October 2018 at 12:25pm
Got them in the studio, pretty large compared to my previous ones but stereo image is way better




Short video:

https://drive.google.com/file/d/1cjUlwCxE09mUhfXW2R6WIo0T4rqFdn3k/view?usp=sharing



Edited by vertx - 18 October 2018 at 9:05pm
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Mircea Bartic Quote  Post ReplyReply Direct Link To This Post Posted: 16 October 2018 at 3:42pm
excellent work !
general manager & head designer at nexus-acoustics research
http://www.facebook.com/nexus.acoustics.research

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Post Options Post Options   Thanks (1) Thanks(1)   Quote concept-10 Quote  Post ReplyReply Direct Link To This Post Posted: 16 October 2018 at 6:11pm
perfect Smile
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sypa Quote  Post ReplyReply Direct Link To This Post Posted: 16 October 2018 at 6:47pm
Is there one plate feeding both or? 
How did it turn out regarding the final price ? 
Reckon not cheap, but atleast you know you have quality components. 
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Post Options Post Options   Thanks (1) Thanks(1)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 16 October 2018 at 7:28pm
Looking nice, well done. Might benefit from baffle step compensation under ~100Hz if you don't mind losing some headroom over the rest of the spectrum
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vertx Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2018 at 10:38am
Originally posted by Sypa Sypa wrote:

Is there one plate feeding both or? 
How did it turn out regarding the final price ? 
Reckon not cheap, but atleast you know you have quality components. 


There is one FA123 per cab. 100w channel for tweeter, 250w via bridged channels on same board.





Edited by vertx - 11 August 2021 at 11:03am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vertx Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2018 at 10:49am
Originally posted by odc04r odc04r wrote:

Looking nice, well done. Might benefit from baffle step compensation under ~100Hz if you don't mind losing some headroom over the rest of the spectrum


In the form of a low shelf type boost in the DSP?

I've heard the term baffle step before but thought it was more about chamfered baffle edges to help with diffraction?
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Post Options Post Options   Thanks (1) Thanks(1)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2018 at 12:00pm
Yeah, it's a low shelf boost. Chamfered edges is a different effect. The width of the cabinet allows some wavelengths to be reinforced when they leave the driver, basically they "see" the baffle width. When the wavelength gets larger than some number (probably quarter wavelength>cabinet width) then the baffle no longer helps to reinforce the frequency and you get a drop in output as it becomes more omnidirectional.

You need to balance it out with the potential reinforcing effects of the room and cabinet positioning too. I.e. if you put them close to a wall or corner you may not notice as much. As always adjust to suit.


Edited by odc04r - 17 October 2018 at 12:00pm
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Post Options Post Options   Thanks (1) Thanks(1)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2018 at 1:52pm
Originally posted by vertx vertx wrote:

Originally posted by odc04r odc04r wrote:

Looking nice, well done. Might benefit from baffle step compensation under ~100Hz if you don't mind losing some headroom over the rest of the spectrum


In the form of a low shelf type boost in the DSP?

I've heard the term baffle step before but thought it was more about chamfered baffle edges to help with diffraction?

The baffle step on a cab of about your size (I'm guessing in the ballpark of 250mm wide?) will be about 460Hz; as odc4r says its based on the 1/4 wavelength.

It happens due to the transition from the driver effectively being in half space when wavelengths are small relative to the size of the baffle (ie upper mids on up) vs in whole space when the wavelengths are big enough to wrap around the cab (low mids on down).

Your fellow Aussie Rod Elliott has written a good summary of it: http://sound.whsites.net/bafflestep.htm

The edge chamfering/diffraction effect is sort of related - for frequencies that have a certain relation to the cab dimension, a sharp edge can cause even more of a reflection than just the standard baffle step effect, so rounding the cab edge can help offset that.

Tolvan Audio's free "Edge" software can model both the baffle step and edge effects as well: http://www.tolvan.com/index.php?page=/edge/edge.php.

Obviously, moving a cab relative to larger boundaries (ie desk, walls etc in your studio) will affect things - at the larger scale, room gain will offset the effect for lower frequencies anyway.
So ideally, you'd want to remeasure in situ to get the best results.

HTH,
David.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vertx Quote  Post ReplyReply Direct Link To This Post Posted: 18 October 2018 at 11:48am
Took some measurements of them when in the studio, and tbh I really should get up to speed on sound treatment... Pinch

With EQ, no smoothing


with psychoacoustic smoothing (at least makes me feel a bit better LOL )


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