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Without using an equilizer, can I fix this problem?

Posted by PriyaW (A) on October 31, 2002 at 10:51:17

For the longest time, I wanted to measure the frequency characteristics of my listening room. Using the Stereophile Test CD2 (tracks 16,17 and 18) and Radio Shack SPL meter, I measured the frequency response of my listening room recently. My Thiel 3.6 speakers were driven by Audio Research 100.2 amp.

SPL-(dB)-76--75--74--73--72--71--70--69--68--67--66

16.0-kHz------------------------------------------*
12.5----------------------------------------------*
10.0--------------------------------------*--------
-8.0----------*------------------------------------
-6.3----------*------------------------------------
-5.0------------------*----------------------------
-4.0--------------------------*--------------------
-3.15---------------------*------------------------
-2.50---------------------*------------------------
-2.00---------------------*------------------------
-1.60---------------------*------------------------
-1.25-------------------------*--------------------
-1.00-----------------------------*----------------
800-Hz----------------------------*----------------
630-------------------------------*----------------
500---------------------------------------*--------
400---------------------------------------*--------
315-------------------------------*----------------
250-----------*------------------------------------
200-----------*------------------------------------
160-----------*------------------------------------
125---------------*--------------------------------
100---------------*--------------------------------
-80-----------*------------------------------------

Volume level was setup so that SPL reading was 70dB at 1kHz. As you can see, there is a 72dB (2dB gain difference) plateau between 1.6-3.15kHz. This could be responsible for slightly bright sound I hear every now and then although I almost always blame my speakers. Further, 6.3-8kHz is at 75dB level (5dB gain difference) and this too also contribute to my problems.

Is there a way to reduce these humps in the above frequency response WITHOUT using an equilizer?? Room treatments are what I have in mind. However, these room modes are problamatic and I may have to live with it until I change my room. Moving the speakers and the changing listening chair position are another options. What are your experiences? What would be the most effective?? Like to hear from you.

Thanks

Priya

p.s. All values in the above figure are POSITIVE

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