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Old 18th November 2011, 06:48 PM   #1
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Default How to Treat Passively Peaky FullRange Drivers

This thread is about keep FullRange drivers crossoverless to listen its Harmonic Integrity, that is the best feature a FR can delivery to the music lover.
If you are a CrossOver lover you may be frustated here.

Some Full Ranges drivers had strong mid-treble response, to keep it crossoverless, is need some passive treatment to smother the high frequencies.
Of course passive, is a non electronic part, as inductor, capacitor, DSP etc.

1) First: around all the box corners, even the small ones, with a triangular or L shape profile of wood or MDF. Alternatively can be used that soft massa/dough of caulk, avoid plastic or metal parts.

2) Second: Paint matte black all walls inside the box, even the Baffle, it is not difficult with a spray can.

3) Stuffing all the fullrange magnet with 30 to 50mm black foam or dark blue or brown. Pressed wool 20-30mm also is good. You will need some glue. Please note, that foam begins to crumble/mill after some 10 years, so use a new quality sample of medium density. Avoid 10mm carpet or non shaggy rug.

4) Stuffing inside the box as recommended by the driver manufacturer or even more. If the box is BassReflex, stuffing the duct also, with dark foam, not the inside of the duct/flute of course, but the outside of the duct.

5) Foam will raise the bass response too, that is great, as I am a bass fan.

Please Note: Foam and wool blanket use space in the internal volume of the box, the white Polyester blanket will not occupy space in the box litrage.

If you had a suggestion or a new trick, please fill free to post here to us.
Cheers
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Old 18th November 2011, 07:31 PM   #2
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Another trick, Use different thicknesses of wood for the enclousere:
BAFFLE = 30mm
BACK = 10 to 15mm
SIDES = 20mm
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Old 18th November 2011, 11:24 PM   #3
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How does painting the enclosure (inside and baffle) matte black "smother the high frequencies"?
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Old 19th November 2011, 12:18 AM   #4
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The black colour decreases the resonances. Different thicknesses of wood too.
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Old 19th November 2011, 12:48 AM   #5
sreten is offline sreten  United Kingdom
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Hi,

The paint will have next to no effect unless its very thick. Bitumastic car
underbody spray (anti-chip) will be far more effective than matt black paint.

Triangular fillets in all corners will have next to no effect regarding the issue.

Stuffing of the box if overdone done will kill any bass.

None of the above will "smother" the high end output of a FR driver.

Passive means no active electrical components, not no electrical components.

Passive electrical filters on FRs by making the response flatter also improve
the phase response and transient response. No reason not to use them.

A correction filter is not a crossover and has none of the issues of a crossover.

rgds, sreten.
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Old 19th November 2011, 02:00 AM   #6
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Of course since the Fullrange "peakyness" is not to be denied the best solution is to design the right cab that " boost's" the lower freq. Now it is easier said then done. That were all the inovation pays off the most!
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Old 19th November 2011, 02:49 AM   #7
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Quote:
Originally Posted by sreten View Post
Hi,

The paint will have next to no effect unless its very thick. Bitumastic car
underbody spray (anti-chip) will be far more effective than matt black paint.
The black paint effect varies according to the speaker. Sonus-Faber use just black dye, not paint, but charge a lot for his speakers.

Triangular fillets in all corners will have next to no effect regarding the issue.
A 90 square corner are a hard load(mainly in narrow enclousures) to light weight paper cones, some times under only 10 grams for a 8 inches driver.
This effect is so important, pro-audio speakers use trapezoidal enclousures, to avoid square corners.


Stuffing of the box if overdone done will kill any bass.
Varies according the speaker type, model etc.

None of the above will "smother" the high end output of a FR driver.
Again, varies according the FR used. I had success in lower the hi freq of a pro audio FR, each speaker is a diffrerent case.

Passive means no active electrical components, not no electrical components.
Electrical components had no irrelevant effect on the music signal, for this reason they are used to modeled the music signal.

Passive electrical filters on FRs by making the response flatter also improve
the phase response and transient response. No reason not to use them.
Artificial flat response, created by notch filters made no improvement in the music signal. Instead it made a corruption in the original music signal.
If the sound result is good or bad, is a personal taste. But not suited to a purist fullrange.
Even a small capacitor in the music path, will change(corrupt) the music signal.


A correction filter is not a crossover and has none of the issues of a crossover.
A fullrange driver is what it is, good, very good or bad, what it had best is the Harmonic Integrity, this H.I. is the original recording sense, it not exist with filters as know by FR fans.

rgds, sreten.
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Old 19th November 2011, 04:12 AM   #8
type is offline type  United States
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Quote:
Originally Posted by FullRangeMan View Post
The black colour decreases the resonances. Different thicknesses of wood too.
I don't know about paint, but I wonder how this would work as a sound deadening material:

https://www.getflexseal.com/?tag=im|...a_bid=a4cc8494

No one laugh
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Old 19th November 2011, 02:33 PM   #9
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by FullRangeMan View Post

Artificial flat response, created by notch filters made no improvement in
the music signal. Instead it made a corruption in the original music signal.

.... this H.I. is the original recording sense ......
Hi,

That is completely wrong. It is impossible to sensibly discuss dogma.

Harmonic Integrity ? I doubt you can sensibly define what this is,
other than by saying so and so messes it up, messes what up ?
Again a dogmatic approach impossible to sensibly discuss.

rgds, sreten.
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Old 19th November 2011, 03:12 PM   #10
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Quote:
No one laugh

Not laughing, but does the stuff stank?


Terry
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