frequency range attenuation

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disker

Member - Posts: 33

Joined: August 04, 2006

Location: United States

Posted: February 01, 2010 at 7:30 PM / IP Logged

I am putting together a small system for my wife's new VUE. HU and speaker upgrades only - she doesn't want any amplifiers or such that take up room. The speakers I'm looking at using are rather bright from the 5k to 8k range. Since I'm not using external amplifiers, I can't use an EQ to smooth these frequencies out like I have done in my personal system.

Is there a simple non powered circuit that I can build to attenuate this frequency range and change components out to increase or decrease the amount of attenuation?

Thanks!

Disker

oldspark

Gold - Posts: 4,913

Joined: November 03, 2008

Location: Australia

Posted: February 01, 2010 at 9:40 PM / IP Logged

As far as wives are concerned, we ARE the unpowered device that attenuates....

The obvious would be to get into the unit at the pre-amp level and add a filter/EQ.

Otherwise a "heavier" filter is required between the amp & speakers...

Could you add a filter - ie, crossover network - into the speakers? (Assuming it's to be a permanent adjustment.)

Otherwise different speakers, or re-tune the box acoustics - maybe the right baffling or fill? (Do they still produce notch & bandpass materials?) Or noise-canceling...

Otherwise you may find the "brightness" improves with time, though you can accelerate that by attending good concerts without hearing protection. (I recommend the moshpit if fitness & endurace is also desirable.)

j.reed

Copper - Posts: 716

Joined: January 05, 2009

Location: Arkansas, United States

Posted: February 01, 2010 at 9:47 PM / IP Logged

disker wrote:

Is there a simple non powered circuit that I can build to attenuate this frequency range and change components out to increase or decrease the amount of attenuation?

Thanks!

If its simply the fact of an amp taking up space there are many ways to hide them or locate them so they do not take up usable space. Under a seat, mounted in rear deck of the trunk or even behind a kick panel in the trunk. Just something to consider.

frequency range attenuation -- posted image.

i am an idiot

Platinum - Posts: 13,670

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: February 01, 2010 at 10:33 PM / IP Logged

you need a notch filter. First result in the following link should help you. Use 5000, 8000, and 6500 for the frequencies,

http://search.yahoo.com/search?p=notch+filter+car+audio&toggle=1&cop=mss&ei=UTF-8&fr=yfp-t-887

disker

Member - Posts: 33

Joined: August 04, 2006

Location: United States

Posted: February 02, 2010 at 4:49 PM / IP Logged

oldspark wrote:

As far as wives are concerned, we ARE the unpowered device that attenuates....

Ain't that the truth! :)

[QUOTE]The obvious would be to get into the unit at the pre-amp level and add a filter/EQ. [/QUOTE]

I'm looking at using an Alpine w505 - I'd rather not modify a brand new one of these. :)

[QUOTE]Otherwise a "heavier" filter is required between the amp & speakers...

Could you add a filter - ie, crossover network - into the speakers? (Assuming it's to be a permanent adjustment.) [/QUOTE]

The speakers I'm using have a crossover network that goes with them and yes it will be permenant (somewhat...)

[QUOTE]Otherwise different speakers, or re-tune the box acoustics - maybe the right baffling or fill? (Do they still produce notch & bandpass materials?) Or noise-canceling... [/QUOTE]

These are for tweeters, so no box. :)

[QUOTE]Otherwise you may find the "brightness" improves with time, though you can accelerate that by attending good concerts without hearing protection. (I recommend the moshpit if fitness & endurace is also desirable.)[/QUOTE]

The one's I am using in my setup have not toned down any over the last 2 years, so, I'm not expecting that to happen. :)

j.reed wrote:

She's seen what I put in my vehicle, and wants to keep every bit of space open in her new VUE, so I promised her, no amps. (Why did I do something so stupid! LOL)

i am an idiot wrote:

you need a notch filter. First result in the following link should help you. Use 5000, 8000, and 6500 for the frequencies,

http://search.yahoo.com/search?p=notch+filter+car+audio&toggle=1&cop=mss&ei=UTF-8&fr=yfp-t-887

THAT's what I'm looking for! I was playing around with combining high and lowpass crossovers together and it was getting way to complex!!!

THANKS! To everyone!!!

Disker

oldspark

Gold - Posts: 4,913

Joined: November 03, 2008

Location: Australia

Posted: February 02, 2010 at 5:53 PM / IP Logged

FYI only:

Re my reference to "brightness improves with time" - 2 years is not enough.

I was referring to the natural hearing loss that occurs with age, else gigs, else vehicles etc.

So 20 years maybe, not 2 years. Else 20 gigs, etc.

And being the tweeters (alone) that are over-bright - yeah - a notch!

Stupid me assuming that a creature without an amplifier would have speakers comprising more than one speaker per side.

Please convey my apologies for the oversight & unintended insult. frequency range attenuation -- posted image.

disker

Member - Posts: 33

Joined: August 04, 2006

Location: United States

Posted: February 02, 2010 at 6:14 PM / IP Logged

oldspark wrote:

FYI only:

Re my reference to "brightness improves with time" - 2 years is not enough.

I was referring to the natural hearing loss that occurs with age, else gigs, else vehicles etc.

So 20 years maybe, not 2 years. Else 20 gigs, etc.

And being the tweeters (alone) that are over-bright - yeah - a notch!

Stupid me assuming that a creature without an amplifier would have speakers comprising more than one speaker per side.

Please convey my apologies for the oversight & unintended insult. frequency range attenuation -- posted image.

Ah - I thought you were refering to the break-in period in which some speakers can attenuate their sound over certain frequency ranges becoming smoother. :)

Yeah, I am going with seperates both up front and in the rear, so the assumption of more than one speaker per side was completely valid. :)

As for the insult? I didn't see one but if it makes you feel any better, appology accepted. ;)

Disker

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frequency range attenuation

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