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Multi-Way Conventional loudspeakers with crossovers

Is MDF  or plywood better for speaker cabinets?
Is MDF  or plywood better for speaker cabinets?
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Old 15th November 2019, 04:59 PM   #121
Douglas Blake is offline Douglas Blake  Canada
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Originally Posted by Galu View Post
Those speakers must have furnished some flare flapping moments Douglas!
LOL ... Good one!

I don't know about the pants, but they could rattle all the dishes in the kitchen any time I wanted them to.

Had them hooked up to a self-built 50w/ch amplifier (which was high power for the time) and a home-brew pre-amp with a 9 band equalizer.

My neighbours hated me....
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Old 15th November 2019, 05:13 PM   #122
djn is offline djn  United States
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Those speakers must have furnished some flare flapping moments Douglas!
Oh my God, I use to dress just like that.
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Old 15th November 2019, 05:37 PM   #123
Galu is offline Galu  Scotland
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Oh my God, I use to dress just like that.
I go right back to winkle picker shoes and bum freezer suits!
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Old 15th November 2019, 07:14 PM   #124
system7 is offline system7  United Kingdom
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Damrnit, wish I had maty tinman's ability with timber and sawdust:

Click the image to open in full size.

A box just waiting to be populated with a two-way setup!

Just rumbled back from the cinema with Ford versus Ferrari, 1966. A cracker!

Fans of engineering excellence will love this one. Those heavy old cars might measure well, but they won't go round corners! And they can't stop fast!

Racing always tends to fast and light. Just like Harbeth, IMO: YouTube

This is the bleeding edge, IMO.
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Old 15th November 2019, 07:25 PM   #125
bentoronto is offline bentoronto  Canada
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Is MDF  or plywood better for speaker cabinets?

Phoney, phoney, phoney, and the title of the article is a lie.

The diagram (which looks too phoney to be a real measurement)claims to show:

A - vibration on the wall of a some kind of cabinet (likely a box of plywood junk), and

B - a woofer loosely attached to a very damped cabinet

Neither shows audibility to your ears, as the title proclaims. Anybody have that audibility data?

BTW, if your woofer is loosely attached to the cab and therefore the frame of the driver shakes all over the place as the patent claims, what kind of sound issues from that kind of unstable driver?

B.
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Last edited by bentoronto; 15th November 2019 at 07:28 PM.
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Old 15th November 2019, 07:37 PM   #126
maty tinman is offline maty tinman  Spain
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Damrnit, wish I had maty tinman's ability with timber and sawdust:

Click the image to open in full size.

A box just waiting to be populated with a two-way setup!
Tony Gee's build, not mine. I do not like the CSD at HF, cheap tweeter. And other things.

About the importance of Cumulative Spectral Decay: [Video] Speaker measurements by Danny Richie | Audio Science Review (ASR) Forum
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Last edited by maty tinman; 15th November 2019 at 07:54 PM.
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Old 15th November 2019, 08:25 PM   #127
maty tinman is offline maty tinman  Spain
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Default Harbeth loudspeaker, inside

From the video Harbeth Loudspeakers Factory Visit

Light loudspeakers but I can see something black as bitumen or viscoelastic material an the back side.

Click the image to open in full size.

Front, back

Click the image to open in full size.

Crossover

Click the image to open in full size.
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Old 15th November 2019, 08:37 PM   #128
maty tinman is offline maty tinman  Spain
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Harbeth Super HL5plus loudspeaker | Stereophile.com

Click the image to open in full size.

Black material on the endges too. It seems that the back side is a sandwich.

Harbeth Super HL5plus loudspeaker Measurements | Stereophile.com

Click the image to open in full size.

Fig.2 Harbeth Super HL5plus, cumulative spectral-decay plot calculated from output of accelerometer fastened to center of top panel (MLS driving voltage to speaker, 7.55V; measurement bandwidth, 2kHz).


Click the image to open in full size.

Fig.8 Harbeth Super HL5plus, cumulative spectral-decay plot on lower-tweeter axis at 50" (0.15ms risetime).


I like much more the CSD of Ascend Sierra 2-EX RAAL ribbons

Sierra-2EX Measurements

Click the image to open in full size.
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Old 15th November 2019, 08:41 PM   #129
Charles Darwin is offline Charles Darwin  United Kingdom
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Originally Posted by 6vheater View Post

I made a vintage amp an oak case.
You gotta be careful with oak.

No idea if oak dust is carcinogenic, it is however poisonous.
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Old 15th November 2019, 09:13 PM   #130
Galu is offline Galu  Scotland
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You gotta be careful with oak.
No idea if oak dust is carcinogenic, it is however poisonous.
I don't suppose the life expectancy of ship builders in the 18th century was very high!

Around 6,000 trees were used in the construction of HMS Victory, of which 90% were oak.
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