AfterMix Studio

This is the initial measurement taken to compare our 'Before' and 'After' results..As you can see here, my ATC SCM20ASL PRO MK2 didn't match each other perfectly and the lowest low of my ATCs were intersecting with my Subwoofer..this is a clear indication that my main monitors are situated in a wrong position to begin with..This is the 'Before' Result..!!

This is the frequency response of my Beyerdynamic DT1990 Pro..its not a cheap headphone and it's a professional grade one..but based on this frequency response measurement, it Cleary shows that the actual accurate monitoring range is from about 1Khz to about 6.5 Khz and after that is critical zone because of the bump it has on the upper frequencies 7Khz to 8Khz before it starts to roll off from 10Khz..from 1Khz to the lowest frequency is almost useless because of the gradual difference in SPL level which about 30db..this is a very narrow bandwidth for anyone or any engineer who wants to do critical monitoring..Thats why all pro engineers almost never use headphones to mix or master because of its narrow bandwidth..We usually use headphones for mixing only to check panning of instruments in a piece of music or a sound effect, Foley, Dialog in a movie soundtrack, because due to its narrow bandwidth characteristics, it's easily audible to hear this panning and thats also for the extreme Left/Right..I have mentioned this before to many artist/producers that you can't really mix and definitely not master a piece of music on headphones due to this reason and this time around, I am simply showing and proving it..Just use the headphones for what it's intended for, to enjoy music..!!

Spectogram
A spectrogram shows how sound energy decays over time across different frequencies. It’s a powerful tool for analyzing how a room and speakers behave together.
In a professional mastering studio, a good spectrogram reveals fast, clean energy decay — meaning no unwanted ringing, no hidden resonances, and a crystal-clear soundstage.
The cleaner the spectrogram, the more accurately you can hear and trust what you're working on!

Analysis
Subwoofer Spectrogram Analysis (First Image)

Observations:
Energy is highly concentrated from 30 Hz to about 90 Hz, exactly as expected from a properly integrated subwoofer.

Decay at low frequencies is visible but reasonably tight for a subwoofer system.

Some peaks around 60–70 Hz have slightly longer decay (~200–255 ms) but not unusual for bass in small-medium studio rooms.

Above 100 Hz, the subwoofer energy drops off sharply, indicating excellent low-pass crossover behavior with no midrange contamination.

Comparison to World-Class Benchmark:
Elite rooms usually show sub decay under 250 ms at these frequencies.

Your subwoofer decay is very competitive, only very slightly more persistent around 60 Hz but not enough to cause audible smearing in professional work.

Conclusion:
Your subwoofer is behaving tightly and is well-integrated. There is no excessive bloom or masking, and its crossover behavior is clean — which is critical for a mastering-grade low-end foundation.

Bass ringing in even the best rooms may extend up to 150–250 ms, depending on room size and bass trapping — you are well within this standard.

Final Verdict on Spectrogram Performance
Subwoofer: Decay is tight, controlled, and clean. Crossover is well-behaved. No significant low-end smearing.

Group Delay (GD)
Group Delay measures the timing accuracy of different frequencies reaching your ears.
Low group delay means that bass, mids, and highs arrive together — preserving the punch, impact, and clarity of the sound.
High group delay causes smearing and blurring, making it harder to judge transients and dynamics.
In world-class studios, ultra-low group delay is a must for delivering mixes and masters that hit with precision.

Analysis
Group Delay

Benchmark (Sterling Sound, Metropolis Studios):
Group delays are expected to be under 5 milliseconds between 80 Hz and 10 kHz to preserve phase coherence and transient detail.

Your Measurement:
Your group delay is exceptionally low, ranging between 2 ms and 4 ms, with stable readings across the full audible spectrum.

Interpretation:
You are achieving temporal performance on par with elite rooms like Sterling Sound and Metropolis. Such low group delay ensures that fine detail, depth, and timing nuances are captured faithfully.