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Modification RCF cabinet
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serioussound View Drop Down
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    Posted: 26 April 2015 at 7:35pm
First of all I dont want to step on anyones toes here. This is an old RCF design in the bottom I know but RCF dont produce it anymore so I cant buy the original.

The first picture is RCF original speaker with the woofer slightly "angled" outwards.

The second picture is a homebuild construction (I think is very close to the RCF design) with the woofer pointing straight into each other.

I have heard the RCF original subs with "angled" woofers and like it.

I can get some used ones of the homebuild construction with woofer pointing into each other.


So my question is how will the pointing/angling of the woofers likely affect the sound?

All opinions welcome here .. !!
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Points: 920 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kr1sounds Quote  Post ReplyReply Direct Link To This Post Posted: 26 April 2015 at 7:52pm
I see no pictures unless its my browser
I MAN SERVE SELASSIE CONTINUALLY... NO MATTER WHAT THE WEAK HEART SAY

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serioussound View Drop Down
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So sorry here are pictures :)
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Originally posted by serioussound serioussound wrote:

First of all I dont want to step on anyones toes here. This is an old RCF design in the bottom I know but RCF dont produce it anymore so I cant buy the original.

The first picture is RCF original speaker with the woofer slightly "angled" outwards.

The second picture is a homebuild construction (I think is very close to the RCF design) with the woofer pointing straight into each other.

I have heard the RCF original subs with "angled" woofers and like it.

I can get some used ones of the homebuild construction with woofer pointing into each other.


So my question is how will the pointing/angling of the woofers likely affect the sound?

All opinions welcome here .. !!

At subwoofer frequencies, pretty much not at all. Any effect is likely to be a rise in the response to a peak somewhere in the 160-220(ish)Hz range.
HTH,
David.
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serioussound View Drop Down
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Ok I see anyone with another opinion?
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Points: 1568 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mobiele eenheid Quote  Post ReplyReply Direct Link To This Post Posted: 26 April 2015 at 9:22pm
By beginning the cavity small and increasing the cross sectional towards the mouth of the cavity you tune it higher for a given depth. If both pictures you've posted would have the same depth, the upper one would be tuned higher.

The cavity is usually tuned between 80 - 160 Hz for 18"  drivers. Below the tuning it will introduce a gain (limiting bandwidth). Something in the order of + 3 dB @ 80 Hz or + 6 dB @ 160 Hz is a plausible design goal. A high tuning of the reflex port/ chamber will result in more gain, just like an 6th order parallel band pass.

Johan
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MarjanM View Drop Down
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Points: 7816 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 26 April 2015 at 9:32pm
You have seriously liked those boxes? Worst subs i have ever heard.
Marjan Milosevic
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serioussound View Drop Down
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:) you suggest to build some g-sub instead?

You heard the original RCF?
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MarjanM View Drop Down
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Points: 7816 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 26 April 2015 at 9:58pm
Yes the original. A friend of mine has 24 of those. 
Marjan Milosevic
MM-Acoustics
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https://www.facebook.com/pages/MM-Acoustics/608901282527713
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serioussound View Drop Down
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So why buy 24 if it's no good? :)
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Originally posted by serioussound serioussound wrote:

So why buy 24 if it's no good? :)


ToucheLOL
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serioussound View Drop Down
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From what I know not really a cheap cabinet either?
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