Taking a dB reading at each test frequency is tedious. If you are spending $220 on a sound pressure meter, why not download for free, REW from Hometheater dot com, buy a UMIK usb microphone and do real room measurements. Your will get MUCH more than frequency sweeps.
The radio shack meter would suffice. Return the meter you ordered and use those funds to purchase the UMIK and Radio Shack meter... then buy yourself your beverage of choice, reserve a weekend and develop very knowledge of your system/Room Acoustics.
It can be a rabbit hole however if you are wound a little tight and have to have all the answers.
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Main Equipment: Kharma Elegance dB11-S, JL Audio F113v2 X 2, Block Audio Line & Mono SE Amplification, Bricasti M21 DAC, Antipodes Kala K-50 Server, Clearaudio Performance SE. Satisfy tonearm & Maestro Wood MM cartridge.
Power: Shunyata Everest 8000, Sigma XC v2, Sigma NR v2, Block Audio PCs, Defender, ADDPowr Wizard
Grounding: Shunyata Altaira CGS - 4 X Alpha CGS cables,
Network : Supra Cat 8+, Twin (Nenon) Modified Buffalo GS2016 Switches, Keces P3 LPSU,
Cables: Wireworld Platinum 8 USB, Wireworld Platinum Eclipse 8 Speaker cables, 6M & 1M Tubulus Concentus ICs,
Other:Two PSI Audio AVAA C20, Multiple GIK products, Stillpoint Apertures, Stillpoint Minis and Ultra SS, Three 20 Amp lines, Furutech GTX - Gold outlets, Adona Rack
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