Fine Tuning Frequency Response
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Member
Joined: Mar 1999
Posts: 64
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From: Huntsville, AL USA
Fine Tuning Frequency Response
Just thought I would share this. I've got an AudioControl EQX equalizer/crossover combo that I use to flaten out the frequency response of my aftermarket audio system. I have been trying to set the EQ by ear and was never satisfied with the results.
I went out and bought a Radio Shack sound level meter and a CD which produced single tones from 40Hz to 20kHz. The CD also had a track with pink noise.
I set all preamp and eq settings to flat, played the pink noise track and set the head unit volume to measure 90dB on the meter. I used this as a reference. Then I played each tone track and recorded each meter reading. Next, I adjusted the EQ accordingly and measured again, adusted again, etc until I got a flat frequency response. The results from using the meter are amazingly better than the results I got by setting the EQ by ear.
The meter and CD cost a total of $45. An real time analyzer (RTA) adjustment at a local audio shop would have cost $35. Plus when I add/change my system, I can whip out the meter and set it up again.
Hope this is useful.
Later,
ALA G8R
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97 Lariet SC Flare 4x4, Red/Silver, 5.4L, 3.55LS, ORP
**Superchip, K&N w/ ABM, Flowmaster
** Westin Nerf Bars, Soft Tonneau, Bel Radar Detecter
** Pioneer CD Player, Infinity 57.1CS components up front, Polk 572a's in back, MTX 5000 Thunderform subs, 300 Watt Soundstream Amp for sub, Rockford Fosgate 400a4 for front/rear, Audio Control EQX, Streetwires Power Distribution
I went out and bought a Radio Shack sound level meter and a CD which produced single tones from 40Hz to 20kHz. The CD also had a track with pink noise.
I set all preamp and eq settings to flat, played the pink noise track and set the head unit volume to measure 90dB on the meter. I used this as a reference. Then I played each tone track and recorded each meter reading. Next, I adjusted the EQ accordingly and measured again, adusted again, etc until I got a flat frequency response. The results from using the meter are amazingly better than the results I got by setting the EQ by ear.
The meter and CD cost a total of $45. An real time analyzer (RTA) adjustment at a local audio shop would have cost $35. Plus when I add/change my system, I can whip out the meter and set it up again.
Hope this is useful.
Later,
ALA G8R
------------------
97 Lariet SC Flare 4x4, Red/Silver, 5.4L, 3.55LS, ORP
**Superchip, K&N w/ ABM, Flowmaster
** Westin Nerf Bars, Soft Tonneau, Bel Radar Detecter
** Pioneer CD Player, Infinity 57.1CS components up front, Polk 572a's in back, MTX 5000 Thunderform subs, 300 Watt Soundstream Amp for sub, Rockford Fosgate 400a4 for front/rear, Audio Control EQX, Streetwires Power Distribution
Senior Member
Joined: Jul 1999
Posts: 1,929
Likes: 1
From: Oklahoma City
Sounds great.
I think I'll try it too as I also have problems adjusting my sub xover.
Have you checked out www.sounddomain.com yet?
I think I'll try it too as I also have problems adjusting my sub xover.
Have you checked out www.sounddomain.com yet?
Senior Member
Joined: Jun 1999
Posts: 170
Likes: 0
From: Newport Beach, CA
I do the same thing. Also known as RTA the long way. Much cheaper than a Real Time Analyzer. (Around 1000)
Those interested can find the info @ http://www.angelfire.com/ca/DrOhm/RTA.html
Todd
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97 White F-150 XLT 4X4 ORP, 4.6, SuperChip, Stillen Air Intake, Gibson Exhaust, Weld Wheels, 33" Bridgestone A/T Duelers, 3" Body Lift, Rancho 9000's, Billet Grill, SmittyBilt Nerf Bars (Stainless), SnugTop Shell (Expo), Electric Sunroof, Super White Headlights.
Future Mods : White face gauge. Supercharger.
Sound System:
Sony ES CDX780 Head Unit, Sony ES 10 Disk Changer, Sony ES XDP 210 EQ/DSP, MTX Pro 4X75W AMP, Kenwood 300W AMP for Sub., 1 Fared Lightning Monitor Cap, Optima Yellow Top Battery, MTX ThunderForm W/2-8"-4ohm Fosgate Punch XLC, Infinity Kappa components in front, Infinity Kappa 5X7 rear.
Photos :
www.geocities.com/Pipeline/Reef/5783/
Those interested can find the info @ http://www.angelfire.com/ca/DrOhm/RTA.html
Todd
------------------
97 White F-150 XLT 4X4 ORP, 4.6, SuperChip, Stillen Air Intake, Gibson Exhaust, Weld Wheels, 33" Bridgestone A/T Duelers, 3" Body Lift, Rancho 9000's, Billet Grill, SmittyBilt Nerf Bars (Stainless), SnugTop Shell (Expo), Electric Sunroof, Super White Headlights.
Future Mods : White face gauge. Supercharger.
Sound System:
Sony ES CDX780 Head Unit, Sony ES 10 Disk Changer, Sony ES XDP 210 EQ/DSP, MTX Pro 4X75W AMP, Kenwood 300W AMP for Sub., 1 Fared Lightning Monitor Cap, Optima Yellow Top Battery, MTX ThunderForm W/2-8"-4ohm Fosgate Punch XLC, Infinity Kappa components in front, Infinity Kappa 5X7 rear.
Photos :
www.geocities.com/Pipeline/Reef/5783/