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-=SHOW OFF YOUR SOUND SYSTEM!!!!=-PART 3
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Old Croc
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    Posted: 19 December 2021 at 11:31pm
Some pics from the party we did a couple of weeks ago, 4 rigs over 2 rooms, our first proper show after the worlds longest lockdown here in Melbourne.

L-R Adrians Wall, Housewife's Choice & Solidarity Sound Systems







And in room 2 we had a third of the SubTemple Sound System rig





Also bonus outdoor rave from Saturday just gone with Sub Yard Sound System and their brand new 18TBX100 drivers getting broken in with a lot of D&B and sounding very nice compared to the old ones they replaced.
Adrians Wall Sound System
Melbournes Rootical Warrior
Roots - Dub - Steppers

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Old Croc
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Points: 3058 		Post Options Post Options   Thanks (0) Thanks(0)   Quote paulus Quote  Post ReplyReply Direct Link To This Post Posted: 06 October 2021 at 10:24am
rff

Edited by paulus - 06 October 2021 at 10:25am
TRENDSETTER SOUND SYSTEM
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Young Croc
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Originally posted by djkeet djkeet wrote:

Nice set up have you had chance to do an A/B comparison with your custom subs V Silver/Golden Paraflex Subs or do think there's no need? @ HMAUDIO

Which system are you referring to?
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Points: 445 		Post Options Post Options   Thanks (0) Thanks(0)   Quote djkeet Quote  Post ReplyReply Direct Link To This Post Posted: 05 September 2021 at 9:18pm
Nice set up have you had chance to do an A/B comparison with your custom subs V Silver/Golden Paraflex Subs or do think there's no need? @ HMAUDIO

Edited by djkeet - 05 September 2021 at 9:23pm
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Points: 377 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AndyWave Quote  Post ReplyReply Direct Link To This Post Posted: 27 August 2021 at 10:10pm
Thank You for the tip.

Unfortunately that would mean to re-arranging all my furniture, and would make the room somewhat unusable as living room.LOL

As my living room is on the small side, quite subtle movements of 'speaker position make a difference, mostly in the bass end. Other hand the speakers have so much cone area, that they dominate the room to a some extent, in low midrange definitely.

Overall I'm satisfied about the sound, in no means its perfect, but different instruments sound about right, I can hear what each musician is doing etc.

Bad records sound bad and good ones sound better. Also it doesn't matter if theres some Brazilian bossa nova or Techno classics from 90's playing.

When I was voicing the speakers (crossovers), I many times put a random CD or radio playing and go to the kitchen cookin' some, that way I hear only the power response from living room through the doorway. Quite revealing...

I believe that my contraption as is would sound quite horrible in a glass walled, stone floored reverberation hell, as my living room is quite dead sounding already.

-Andy
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Young Croc
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Points: 599 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Contour Quote  Post ReplyReply Direct Link To This Post Posted: 26 August 2021 at 6:53pm
For best bass and 3D imaging place open baffle’s 1/3 to 40% from the rearwall, and very close to the sidewalls, this way the speakers really will disappear and a huge stage will fill your room. 
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Points: 377 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AndyWave Quote  Post ReplyReply Direct Link To This Post Posted: 26 August 2021 at 2:26pm
Thank You JBL.

I've gone for pro audio drivers for my home stereo few times before, connected to small wattage amps.

But these monstrosities are my first open baffle solutions. As I wanted bass below 40's to be present at least some level, there is not much else to do but use lots of cone surface area. Distance from rear wall needs to be around 80cm with some toe in to get the bass alive.

High Qts open baffle specific drivers exist, but with Qts around 0,7-1,0 they sound bit flabby, boomy and unprecise to my ears...

I think there is easily something missing in music with high loss HiFi drivers, the more acoustic the original presentation is, the more it suffers. (Dynaudio, ATC, PMC or other that level stuff is excluded)

Cheers, Andy
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Points: 11026 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 26 August 2021 at 8:11am
 Clap Nice job Andy, i do like home hifi made from random spares of pro units. Did a similar thing a few years back, stereo pair of old Altec 921  15" (is actually a 16-inch driver) and a single jbl bullet above, passive crossover, no cabinet at all, just a baffle as you have done. Stood them 2 feet back from the room corners.

On jazz and soul records the sound was clear and natural.
Be seeing you.
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Points: 377 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AndyWave Quote  Post ReplyReply Direct Link To This Post Posted: 25 August 2021 at 8:36pm
ClapClap

Despite my particular home stereo project never sees a 10mm cone movement, I must at least knife edge the support plate area behind the vent. Never hurts to be on safe side. It's not at all a big job, few passes with router.....

Other hand on my PA-cabinet projects I have always left sufficient room for the vents.Wink

Thanks guys, and hats off for both of You, Andy


Edited by AndyWave - 25 August 2021 at 8:39pm
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Points: 267 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tinnitus Rex Quote  Post ReplyReply Direct Link To This Post Posted: 25 August 2021 at 6:43pm
As above, try it . learning by doing is also better and I commend your project for that.Smile


Edited by Tinnitus Rex - 25 August 2021 at 6:50pm
"couldn't we just like... use headphones?"
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I read the above discussion with interest, so I did a quick test set up to see what the result would be:

I took an RCF L15P/200 driver (which has a central cooling vent diameter of 44mm) and stood it off my workbench on two 75mm x 75mm wooden blocks. These were positioned well away from the vent.

I then set up a tone generator running though an amplifier and put a low frequency tone though the speaker (around 30Hz). This was done at a level to generate movement of the speaker of about 1 cm peak to peak. The speaker sounded "clean" with just a "chuffing" sound of air passing from the vent.

I then got a small piece of 18m plywood and partially obscured the vent with this. Now along with the "chuffing" sound from the vent I could hear a change in the in the previously "clean" sound from the speaker. I guess that this would be caused by some sort of back pressure on the speaker dome caused by the plywood partially obscuring the vent.

Why design a speaker box that reduces the cooling efficiency of the driver, and causes colouration of the sound?
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Points: 377 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AndyWave Quote  Post ReplyReply Direct Link To This Post Posted: 25 August 2021 at 4:45pm
Thank You for understanding my engineer side of soul. Handshake

BTW, You mentioned some observations about blocking cooling vents, have you conducted any measurements? I'll accept observations by ear also, thats what we use to listen music and sounds afterall.

And maybe we should conduct our heated debate of blocked vents in an appropriate section of forum. LOL

cheers, Andy
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