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Author Topic: Factory Speaker Specs & Grilles  (Read 15334 times)

John Roberts {JR}

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Re: Factory Speaker Specs & Grilles
« Reply #50 on: December 05, 2015, 04:19:23 pm »

and for the quadrajet(bawoooooooom) carb sound.

     http://www.youtube.com/watch?v=IjL9hmdbqj4
Actually a decent sized Holley (650 CFM IIRC) that I bought off a junkyard 396 ci chevy...

The quadrajet was a rochester carb.

JR
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Don't tune your drums half-ass. Listen to what a properly "cleared" drum sounds like.   http://circularscience.com/

Gary Weller

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Re: Factory Speaker Specs & Grilles
« Reply #51 on: December 06, 2015, 05:51:35 pm »

No. It's usually round or hexagonal. Obviously hexagonal has more open space than round, although you might be able to reduce the spacing between the apertures as it will be wider elsewhere. 

I have some Peavey UL115 subs which have square perforated grills but I can't think of any others.


Steve.

JBL SR4700 series had square perforated grills.
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Steve Payne

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Re: Factory Speaker Specs & Grilles
« Reply #52 on: December 07, 2015, 08:39:16 am »

When I was kid we used to take the air cleaner off our car engine to make it faster...

JR

I can still hear the deep moan of my parents '58 Chevy, 348 cid, power glide with the air cleaner in the trunk!  My Dad would have kicked my ass if he'd known.  :-)
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Chris Hindle

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Re: Factory Speaker Specs & Grilles
« Reply #53 on: December 07, 2015, 12:40:48 pm »

I can still hear the deep moan of my parents '58 Chevy, 348 cid, power glide with the air cleaner in the trunk!  My Dad would have kicked my ass if he'd known.  :-)
The day I bought home my 71 Trans Am (455HO, 4spd) in 1976 or 77, I "let" Dad take it for a spin. After parking it, he says "You know, if that thing wasn't so bloody loud, I'd like to take it to work, and show off to the kids."
He is an interesting man, my Father. He's pushing 80 now, and still likes to "play"
everyone should be so lucky.
Chris.
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John Roberts {JR}

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Re: Factory Speaker Specs & Grilles
« Reply #54 on: December 07, 2015, 01:03:37 pm »

I can still hear the deep moan of my parents '58 Chevy, 348 cid, power glide with the air cleaner in the trunk!  My Dad would have kicked my ass if he'd known.  :-)



Back in the '70s I was visiting friends who were racing their cars. I was driving my street stock Barracuda (small v8 2 barrel). I paid for a pit pass so i could hang out with my friends in the pit, and they said I should race my car. I borrowed a helmet and put my air cleaners in the trunk.....   I won*** H-Stock Automatic.  8)

JR

*** only reason I won was because all the go fast boys, were bracket racing for more money. I got a cheap trophy and actually turned in a faster time than F stock.  :-[
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Don't tune your drums half-ass. Listen to what a properly "cleared" drum sounds like.   http://circularscience.com/

Ivan Beaver

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Re: Factory Speaker Specs & Grilles-The BEST way
« Reply #55 on: December 11, 2015, 02:31:44 pm »

Of course the BEST way is to no speculate, but actually MEASURE-WOW-what a concept :)
 
I know some people don't like to measure and would rather speculate and "model", but I am old fashioned and like to actually measure and see what is happening in the REAL world.

So I was doing some measurement today and thought I would give it a shot.

This is a kinda large horn (45" x24") with a 1.4" driver.

As you can see, the grill both CUTS AND BOOSTS the high end.  It DEPENDS on what freq you are talking about.

Here is a screen shot, On axis about 2M away, with 2 seconds of averaging and a pretty narrow vertical window.

The PINK is without the grill and the GREEN is with the grill.

The grill is about 60% open and no backing cloth.

I will let others decide if the 0.1dB is worth consideration----

And before anybody asks-NO I did not do any off axis measurements.

I have a lot to do to finish up the year and just wiggled this one test in-since I was setup.
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Ivan Beaver
Danley Sound Labs

PHYSICS- NOT FADS!

Jim McKeveny

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Re: Factory Speaker Specs & Grilles-The BEST way
« Reply #56 on: December 12, 2015, 09:19:10 am »

Of course the BEST way is to no speculate, but actually MEASURE-WOW-what a concept :)
 
I know some people don't like to measure and would rather speculate and "model", but I am old fashioned and like to actually measure and see what is happening in the REAL world.

So I was doing some measurement today and thought I would give it a shot.

This is a kinda large horn (45" x24") with a 1.4" driver.

As you can see, the grill both CUTS AND BOOSTS the high end.  It DEPENDS on what freq you are talking about.

Here is a screen shot, On axis about 2M away, with 2 seconds of averaging and a pretty narrow vertical window.

The PINK is without the grill and the GREEN is with the grill.

The grill is about 60% open and no backing cloth.

I will let others decide if the 0.1dB is worth consideration----

And before anybody asks-NO I did not do any off axis measurements.

I have a lot to do to finish up the year and just wiggled this one test in-since I was setup.

Winner Winner Chicken Dinner!!

Thanks Ivan!
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John Roberts {JR}

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Re: Factory Speaker Specs & Grilles-The BEST way
« Reply #57 on: December 12, 2015, 09:54:35 am »

Of course the BEST way is to no speculate, but actually MEASURE-WOW-what a concept :)
 
I know some people don't like to measure and would rather speculate and "model", but I am old fashioned and like to actually measure and see what is happening in the REAL world.

So I was doing some measurement today and thought I would give it a shot.

This is a kinda large horn (45" x24") with a 1.4" driver.

As you can see, the grill both CUTS AND BOOSTS the high end.  It DEPENDS on what freq you are talking about.

Here is a screen shot, On axis about 2M away, with 2 seconds of averaging and a pretty narrow vertical window.

The PINK is without the grill and the GREEN is with the grill.

The grill is about 60% open and no backing cloth.

I will let others decide if the 0.1dB is worth consideration----

And before anybody asks-NO I did not do any off axis measurements.

I have a lot to do to finish up the year and just wiggled this one test in-since I was setup.
There you go confusing the issue with FACTS.

JR
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Don't tune your drums half-ass. Listen to what a properly "cleared" drum sounds like.   http://circularscience.com/

John L Nobile

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Re: Factory Speaker Specs & Grilles
« Reply #58 on: December 12, 2015, 03:23:21 pm »

Thanks for posting that Ivan. Wish I had the gear to do my own testing.

But it does look nicer :)
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Ivan Beaver

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Re: Factory Speaker Specs & Grilles
« Reply #59 on: December 12, 2015, 03:44:34 pm »

Thanks for posting that Ivan. Wish I had the gear to do my own testing.

But it does look nicer :)
Yes you "could argue" that the grill response is "smoother".

But would challenge ANYBODY to do a blind test and pick out 0.1dB differences-especially over the limited range that they are affecting.

Now I will admit that the "total experience" with the grill on may be different than what I measured.

I did not have reflections getting into the measurement-and as you move off axis the "apparent open area" is less than on axis.

You can see this by looking at a grill with holes in it-as you look at it from an angle, the holes get more oval and the total open area  is less.

So more reduction is possible-so the reflections are going to have less HF than without the grill.

Of course this will "depend" on the particular situation.

I doubt I will have time (I have a VERY limited amount of time left in the year-we are talking about just a few hours) , but if I get a chance I will grab a quick off axis measurement and see how it is affected.

Measurements win every time over speculation or modeling.  But not everybody believes that.  They would much rather play on the computer than get out in the real world and SEE what is happening--------- Oh well.

 

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Ivan Beaver
Danley Sound Labs

PHYSICS- NOT FADS!

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Re: Factory Speaker Specs & Grilles
« Reply #59 on: December 12, 2015, 03:44:34 pm »


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