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List of Amir's Headphone PEQ filters

sweetchaos

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#1
Here's a quick Parametric Equalization (PEQ) guide based on Amir's excellent headphone reviews! :D

Which EQ software are available?
@Doodski created a detailed post showing all known EQ software.
Read that if you want suggestions on which software are available.
Using Windows?
The 2 most often recommended FREE software are:
1. Equalizer APO - parametric / graphic equalizer.
1608446364294.png

2. Peace - graphical interface for Equalizer APO.
*Optional software*, but often *recommended* in addition to Equalizer APO.
1608453710778.png
What does Amir post with each headphone review?
With each headphone review, Amir posts his PEQ filters (that he creates using Roon software. More info).
Sennheiser HD800S Measurements Equalization 2.png


As you can tell, Amir doesn't post the preamp gain needed for equalization.
So when he's testing headphones, he simply turns the PEQ filters on/off and it allows him to A/B test instantly without changing other variables.

However, to avoid overdriving your headphone amplifier into clipping the signal, it's a good idea to apply a negative preamp gain.
This negative preamp gain will offset the positive PEQ gain, back to a '0' reference plane.
There is no formula to calculate the preamp gain needed, but we can use software to help.
[Optional] How to calculate the preamp gain needed for Amir's posted PEQ filters?
***You do not need to perform these steps, as I've done it for you.***
This is simply for educational purposes, so you understand where preamp gain comes from.
1. Read Amir's headphone review, look for Roon PEQ filters
2. Create a .TXT file with his filters, and input values based on guide:
Filter 1: ON LS Fc 40 Hz Gain 8.0 dB Q 1.0
Filter 2: ON LS Fc 75 Hz Gain 3.0 dB Q 1.0
Filter 3: ON PK Fc 2705 Hz Gain 3.0 dB Q 1.0
Filter 4: ON PK Fc 5400 Hz Gain -3.0 dB Q 3.0
Filter 5: ON HS Fc 10000 Hz Gain -2.0 dB Q 1.0
3. Open that .TXT file using Equalizer APO (Go to File, Open)
4. You'll see the dashboard:
1608448841093.png

You'll see 'peak gain' of 11.7 dB in red color.
This means that a preamp gain of -11.7 dB is needed to offset the PEQ filters back to a '0' reference plane.
5. Now we append the .TXT file with this information and it becomes:
Preamp: -11.7 dB
Filter 1: ON LS Fc 40 Hz Gain 8.0 dB Q 1.0
Filter 2: ON LS Fc 75 Hz Gain 3.0 dB Q 1.0
Filter 3: ON PK Fc 2705 Hz Gain 3.0 dB Q 1.0
Filter 4: ON PK Fc 5400 Hz Gain -3.0 dB Q 3.0
Filter 5: ON HS Fc 10000 Hz Gain -2.0 dB Q 1.0
6. Import the .TXT into Equalizer APO or Peace (whichever you prefer)
How to import these PEQ filters into Equalizer APO?
1. Open Equalizer APO
2. File, Open, Select the .TXT file with Amir's PEQ filters (from this thread).
Example: "Sennheiser HD800S.txt"
Preamp: -11.7 dB
Filter 1: ON LS Fc 40 Hz Gain 8.0 dB Q 1.0
Filter 2: ON LS Fc 75 Hz Gain 3.0 dB Q 1.0
Filter 3: ON PK Fc 2705 Hz Gain 3.0 dB Q 1.0
Filter 4: ON PK Fc 5400 Hz Gain -3.0 dB Q 3.0
Filter 5: ON HS Fc 10000 Hz Gain -2.0 dB Q 1.0
How to import these PEQ filters into Peace?
1. Open Peace.
2. ***Must do this once***. Go into Settings, select tab 'Sizes and Amounts Settings', change 'Snap dB Gain' from 0.5 to 0.1, save.
3. When looking at the dashboard, you'll see an 'Import' button, select it.
1608449208841.png

4. Select the .TXT file with Amir's PEQ filters (from this thread).
Example: "Sennheiser HD800S.txt"
Preamp: -11.7 dB
Filter 1: ON LS Fc 40 Hz Gain 8.0 dB Q 1.0
Filter 2: ON LS Fc 75 Hz Gain 3.0 dB Q 1.0
Filter 3: ON PK Fc 2705 Hz Gain 3.0 dB Q 1.0
Filter 4: ON PK Fc 5400 Hz Gain -3.0 dB Q 3.0
Filter 5: ON HS Fc 10000 Hz Gain -2.0 dB Q 1.0
5. This step will over-write all previous filters on screen.
6. Verify the filters are correct, and press the 'Save' button.
7. Name it.
8. Once you do, you'll see it show up on the bottom left of the dashboard.
[For Beginners] How to Setup Peace and Import a PEQ Profile:
In the video, I showed the following:
1. Installed Equalizer APO (ignore the error at the end, that's just because it's in a VM)
2. Installed Peace
3. Restarted
4. Opened Peace, set to 'advanced mode'
5. Went to settings, changed 'snap to db gain' from 0.5 to 0.1
6. Showed how many configurations/profiles are by default
7. Deleted all default configurations/profiles, to keep things clean
Specifically, I deleted *.peace from C:\Program Files\EqualizerAPO\config\
8. Went to ASR, to copy a PEQ profile
9. Created .TXT file and pasted PEQ profile
10. Imported PEQ profile to Peace
11. Cleanup, saved the configuration/profile
12. Showed how to view PEQ filters on a graph
13. Showed how to switch between different configurations/profiles
Overall, took 2.5min.
I know some of you are visual learners, so I hope that helps. :D
Want to use another EQ Software?
1. Input the PEQ filters into your software, but keep in mind:
HP => High Pass
HS => High Shelf
LS => Low Shelf
PK => Peaking
2. Input the preamp gain
Are you using 'MathAudio Headphone EQ'?
If you're using MathAudio Headphone EQ, the software does the preamp gain adjustment automatically, in order to avoid audio clipping.
In other words, just enter the PEQ filters, and don't adjust any preamp gain.
You can tell this is true, by looking at the picture of a PEQ profile, where the highest filter (in the bass) is already at 0 dB.
1610935106211.png
[For Advanced Users] How to compare your headphones out-of-the-box (without EQ) against Amir's PEQ filters?
1. Using your favorite EQ app, create a new configuration by importing Amir's PEQ filters (as illustrated above), save it.
2. Create a 2nd configuration, but this time leave the filters at default.
In other words, make a flat EQ profile.
Then, enter the same preamp gain from step #1 (from Amir's PEQ profile), save it.
3. This will make 2 configurations level matched.
Now you can instantly switch between the two configurations, to see how the sound changes.
[For Advanced Users] How to compare multiple PEQ profiles with each other?
1. Let's say you found 3 PEQ profiles online (Amir's and a few others...) for your headphones
2. Import all PEQ profiles into your EQ software
PEQ profile #1:
Preamp: -3.8 dB
Filter 1: ON PK Fc xx Hz Gain x.x dB Q x.x
Filter 2: ON PK Fc xx Hz Gain x.x dB Q x.x
Filter 3: ON PK Fc xx Hz Gain x.x dB Q x.x
PEQ profile #2:
Preamp: -5.4 dB
Filter 1: ON PK Fc xx Hz Gain x.x dB Q x.x
Filter 2: ON PK Fc xx Hz Gain x.x dB Q x.x
Filter 3: ON PK Fc xx Hz Gain x.x dB Q x.x
PEQ profile #3:
Preamp: -4.3 dB
Filter 1: ON PK Fc xx Hz Gain x.x dB Q x.x
Filter 2: ON PK Fc xx Hz Gain x.x dB Q x.x
Filter 3: ON PK Fc xx Hz Gain x.x dB Q x.x
3. To properly compare all PEQ profiles, you'll need to have them level-matched.
To do this, you'll need to set each PEQ profile to have the same preamp, which should be the highest negative preamp gain.
In the example above, a preamp gain of -5.4 dB will need to be manually overridden for PEQ#1 and PEQ#3 profiles.
Save both profiles.
4. Now you can instantly switch between the profiles, to see how the sound changes.
5. After you've found the best sounding PEQ profile, you'll need to revert the preamp gain back to the original.
[For Advanced Users] What do I do when I have channel-imbalanced headphones?
Some headphones have channel imbalances, where one channel (ex. right) plays at a lower volume than the other channel (ex. left).
Amir makes a note of these channel imbalances in the headphone reviews.
How do you tell if your headphones are channel imbalanced?
Play pink noise for each channel and watch for volume differences, to see if you need to boost the preamp gain on one channel.

Superlux HD668B channel imbalance:
In the Superlux HD668B review, Amir noted a channel imbalance.
He boosted the right channel by +2.5 dB to fix it.
To do this in Equalizer APO, we need to offset the preamp on left channel by 2.5dB.
If you want to try this PEQ profile, use this code instead:

Channel: L
Preamp: -11.0 dB
Filter 1: ON LS Fc 30 Hz Gain 4.0 dB Q 1.0
Filter 2: ON LS Fc 50 Hz Gain 4.0 dB Q 1.0
Filter 3: ON PK Fc 4000 Hz Gain 5.0 dB Q 2.0
Filter 4: ON PK Fc 5380 Hz Gain -7.0 dB Q 6.0
Filter 5: ON PK Fc 8582 Hz Gain -7.0 dB Q 5.0

Channel: R
Preamp: -8.5 dB
Filter 1: ON LS Fc 30 Hz Gain 4.0 dB Q 1.0
Filter 2: ON LS Fc 50 Hz Gain 4.0 dB Q 1.0
Filter 3: ON PK Fc 4000 Hz Gain 5.0 dB Q 2.0
Filter 4: ON PK Fc 5380 Hz Gain -7.0 dB Q 6.0
Filter 5: ON PK Fc 8582 Hz Gain -7.0 dB Q 5.0
There are 3 BETA reviews, what are those?
Backstory:
- Sep 30, 2020. Amir got a Gras 45CA headphone measurement fixture (loaner from company), and his first review was RAAL-requisite SR1a Ribbon.
- Oct 15, 2020: His 2nd review (with same fixture) was Audeze LCD-X.
- Oct 20, 2020: His 3rd review (with same fixture) Massdrop X KOSS ESP/95X Electrostatic. He returned the loaner fixture after this review.
- Dec 3, 2020: He announced he purchased a new Gras 45CA-10 headphone measurement fixture and started measuring headphones with it. All of his reviews since were done using the same fixture.
Overall, I called these 'BETA reviews', since they were done with a similar, but not exactly the same, fixture.
_________________________________________________
List of Amir's headphone PEQ filters (sorted A-Z):

Abyss Diana V2:
Preamp: -8.6 dB
Filter 1: ON LS Fc 35 Hz Gain 8.0 dB Q 1.0
Filter 2: ON PK Fc 1194 Hz Gain -2.0 dB Q 2.0
Filter 3: ON PK Fc 2705 Hz Gain 2.5 dB Q 3.0
Filter 4: ON PK Fc 3700 Hz Gain 5.0 dB Q 9.0
Filter 5: ON PK Fc 5464 Hz Gain -2.0 dB Q 8.0
Audeze LCD-X: (BETA review)
Preamp: -8.0 dB
Filter 1: ON HP Fc 22 Hz
Filter 2: ON LS Fc 35 Hz Gain 4.0 dB Q 1.0
Filter 3: ON LS Fc 80 Hz Gain 4.0 dB Q 1.0
Filter 4: ON PK Fc 3000 Hz Gain 8.0 dB Q 2.0
Dan Clark Audio AEON RT:
Preamp: -3.8 dB
Filter 1: ON LS Fc 30 Hz Gain 3.5 dB Q 1.0
Filter 2: ON PK Fc 153 Hz Gain 3.0 dB Q 4.0
Filter 3: ON PK Fc 2884 Hz Gain 3.0 dB Q 2.0
Filter 4: ON HS Fc 6000 Hz Gain -2.0 dB Q 1.0
Focal Clear:
In the Focal Clear review, Amir incorrectly reported +2dB gain (for 11,319 Hz peaking filter) when he posted the PEQ filters photo.
But in the review, he said "lowering of the peak at 11.3 kHz". This means gain should be -2dB (not +2dB).
My code shows the correct value.
Preamp: -5.3 dB
Filter 1: ON LS Fc 40 Hz Gain 3.0 dB Q 1.0
Filter 2: ON LS Fc 75 Hz Gain 2.0 dB Q 1.0
Filter 3: ON PK Fc 1100 Hz Gain -2.0 dB Q 2.0
Filter 4: ON PK Fc 11319 Hz Gain -2.0 dB Q 3.0
HEDD HEDDPhone:
Preamp: -7.5 dB
Filter 1: ON LS Fc 40 Hz Gain 5.0 dB Q 1.0
Filter 2: ON LS Fc 50 Hz Gain 2.0 dB Q 1.0
Filter 3: ON PK Fc 264 Hz Gain -2.0 dB Q 3.0
Filter 4: ON PK Fc 710 Hz Gain -5.0 dB Q 3.5
Filter 5: ON PK Fc 1892 Hz Gain 2.0 dB Q 3.0
Hifiman HE400i 2016:
Preamp: -5.3 dB
Filter 1: ON LS Fc 40 Hz Gain 3.5 dB Q 1.0
Filter 2: ON LS Fc 75 Hz Gain 1.5 dB Q 1.0
Filter 3: ON PK Fc 1900 Hz Gain 5.0 dB Q 2.5
Filter 4: ON PK Fc 5300 Hz Gain 3.0 dB Q 3.0
Filter 5: ON PK Fc 8300 Hz Gain -4.0 dB Q 4.0
Massdrop X KOSS ESP/95X Electrostatic: (BETA review)
Preamp: -3.8 dB
Filter 1: ON HP Fc 22 Hz
Filter 2: ON LS Fc 60 Hz Gain 4.0 dB Q 1.0
Filter 3: ON PK Fc 1106 Hz Gain -3.0 dB Q 2.5
Filter 4: ON PK Fc 4300 Hz Gain 4.0 dB Q 3.0
Filter 5: ON PK Fc 5300 Hz Gain -2.0 dB Q 5.0
NAD Viso HP50:
Preamp: -10.5 dB
Filter 1: ON LS Fc 35 Hz Gain 5.0 dB Q 1.0
Filter 2: ON LS Fc 80 Hz Gain 5.0 dB Q 1.0
Filter 3: ON PK Fc 2100 Hz Gain 2.5 dB Q 2.0
Filter 4: ON PK Fc 2811 Hz Gain 7.0 dB Q 2.0
Filter 5: ON PK Fc 12100 Hz Gain -5.0 dB Q 4.0
Philips Fidelio X2HR:
In the Philips Fidelio X2HR review, Amir noted a channel imbalance.
He boosted the right channel by +1.0 dB to fix it.
To do this in Equalizer APO, we need to offset the preamp on left channel by 1.0dB.
If you want to try this PEQ profile, use this code instead:

Channel: L
Preamp: -4.2 dB
Filter 1: ON LS Fc 40 Hz Gain 3.0 dB Q 1.0
Filter 2: ON PK Fc 277 Hz Gain -1.7 dB Q 4.0
Filter 3: ON PK Fc 1650 Hz Gain -2.0 dB Q 3.0
Filter 4: ON PK Fc 5191 Hz Gain -6.0 dB Q 6.0
Filter 5: ON PK Fc 8200 Hz Gain -2.4 dB Q 5.0
Filter 6: ON HS Fc 12000 Hz Gain -3.0 dB Q 1.0

Channel: R
Preamp: -3.2 dB
Filter 1: ON LS Fc 40 Hz Gain 3.0 dB Q 1.0
Filter 2: ON PK Fc 277 Hz Gain -1.7 dB Q 4.0
Filter 3: ON PK Fc 1650 Hz Gain -2.0 dB Q 3.0
Filter 4: ON PK Fc 5191 Hz Gain -6.0 dB Q 6.0
Filter 5: ON PK Fc 8200 Hz Gain -2.4 dB Q 5.0
Filter 6: ON HS Fc 12000 Hz Gain -3.0 dB Q 1.0
Preamp: -3.2 dB
Filter 1: ON LS Fc 40 Hz Gain 3.0 dB Q 1.0
Filter 2: ON PK Fc 277 Hz Gain -1.7 dB Q 4.0
Filter 3: ON PK Fc 1650 Hz Gain -2.0 dB Q 3.0
Filter 4: ON PK Fc 5191 Hz Gain -6.0 dB Q 6.0
Filter 5: ON PK Fc 8200 Hz Gain -2.4 dB Q 5.0
Filter 6: ON HS Fc 12000 Hz Gain -3.0 dB Q 1.0
RAAL-requisite SR1a Ribbon: (BETA review)
Preamp: -7.1 dB
Filter 1: ON HP Fc 22 Hz
Filter 2: ON LS Fc 40 Hz Gain 4.0 dB Q 1.0
Filter 3: ON LS Fc 80 Hz Gain 4.0 dB Q 1.0
Filter 4: ON PK Fc 2000 Hz Gain -3.0 dB Q 3.0
Filter 5: ON PK Fc 5600 Hz Gain -2.0 dB Q 5.0
Filter 6: ON PK Fc 7520 Hz Gain -2.5 dB Q 4.0
Sennheiser HD650:
Preamp: -8.5 dB
Filter 1: ON LS Fc 40 Hz Gain 5.0 dB Q 1.0
Filter 2: ON LS Fc 75 Hz Gain 3.0 dB Q 1.0
Filter 3: ON PK Fc 7600 Hz Gain 4.0 dB Q 3.0
Filter 4: ON PK Fc 13700 Hz Gain -3.5 dB Q 4.0
Sennheiser HD800S:
Preamp: -11.7 dB
Filter 1: ON LS Fc 40 Hz Gain 8.0 dB Q 1.0
Filter 2: ON LS Fc 75 Hz Gain 3.0 dB Q 1.0
Filter 3: ON PK Fc 2705 Hz Gain 3.0 dB Q 1.0
Filter 4: ON PK Fc 5400 Hz Gain -3.0 dB Q 3.0
Filter 5: ON HS Fc 10000 Hz Gain -2.0 dB Q 1.0
Sony MDR-7506:
Preamp: 0 dB
Filter 1: ON HP Fc 20 Hz
Filter 2: ON PK Fc 3000 Hz Gain -2.0 dB Q 3.0
Filter 3: ON PK Fc 4400 Hz Gain -4.0 dB Q 3.0
Sony MDR-ZX110:
Preamp: -8.6 dB
Filter 1: ON LS Fc 40 Hz Gain 8.0 dB Q 1.0
Filter 2: ON PK Fc 1000 Hz Gain 5.0 dB Q 3.0
Filter 3: ON PK Fc 2500 Hz Gain 5.0 dB Q 2.0
Filter 4: ON PK Fc 5900 Hz Gain 7.0 dB Q 2.0
Superlux HD668B:
In the Superlux HD668B review, Amir noted a channel imbalance.
He boosted the right channel by +2.5 dB to fix it.
To do this in Equalizer APO, we need to offset the preamp on left channel by 2.5dB.
If you want to try this PEQ profile, use this code instead:

Channel: L
Preamp: -11.0 dB
Filter 1: ON LS Fc 30 Hz Gain 4.0 dB Q 1.0
Filter 2: ON LS Fc 50 Hz Gain 4.0 dB Q 1.0
Filter 3: ON PK Fc 4000 Hz Gain 5.0 dB Q 2.0
Filter 4: ON PK Fc 5380 Hz Gain -7.0 dB Q 6.0
Filter 5: ON PK Fc 8582 Hz Gain -7.0 dB Q 5.0

Channel: R
Preamp: -8.5 dB
Filter 1: ON LS Fc 30 Hz Gain 4.0 dB Q 1.0
Filter 2: ON LS Fc 50 Hz Gain 4.0 dB Q 1.0
Filter 3: ON PK Fc 4000 Hz Gain 5.0 dB Q 2.0
Filter 4: ON PK Fc 5380 Hz Gain -7.0 dB Q 6.0
Filter 5: ON PK Fc 8582 Hz Gain -7.0 dB Q 5.0
Preamp: -8.5 dB
Filter 1: ON LS Fc 30 Hz Gain 4.0 dB Q 1.0
Filter 2: ON LS Fc 50 Hz Gain 4.0 dB Q 1.0
Filter 3: ON PK Fc 4000 Hz Gain 5.0 dB Q 2.0
Filter 4: ON PK Fc 5380 Hz Gain -7.0 dB Q 6.0
Filter 5: ON PK Fc 8582 Hz Gain -7.0 dB Q 5.0
_________________________________________________
Changelog:
2020-12-19: Focal Clear, Hifiman HE400i 2016, Sennheiser HD800S
2020-12-25: Sennheiser HD650.
2020-12-31: HEDD HEDDPhone. Thread View Count: 1,910
2021-01-04: Sony MDR-7506. Thread View Count: 2,540 (+32%)
2021-01-05: NAD Viso HP50. Thread View Count: 2,670 (+5%)
2021-01-07: Superlux HD668B. Thread View Count: 3,080 (+15%)
2021-01-09: Philips Fidelio X2HR. Thread View Count: 3,580 (+16%)
2021-01-10: Abyss Diana V2. Thread View Count: 3,960 (+18%)
2021-01-13: +3 previously-excluded reviews (Audeze LCD-X, RAAL-requisite SR1a Ribbon, Massdrop X KOSS ESP/95X Electrostatic). Thread View Count: 4,720 (+19%)
2021-01-14: Dan Clark Audio AEON RT. Thread View Count: 5,000 (+6%)
2021-01-18: Sony MDR-ZX110. Thread View Count: 5,830 (+17%)
 
Last edited:
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sweetchaos

sweetchaos

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sweetchaos

sweetchaos

Major Contributor
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Thread Starter #12
Improvements added:
How to compare your headphones out-of-the-box (without EQ) with Amir's PEQ filters?
1. Using your favorite EQ app, create a new configuration by importing Amir's PEQ (as shown above), save it.
2. Create a 2nd configuration, but this time leave the filters at default. In other words, make a flat EQ profile. Then, enter the same preamp gain from step #1 (from Amir's PEQ profile), save it.
3. This will make 2 configurations level matched, so now you can A/B test *instantly* between the two configurations to see how much of a difference there is.
 
OP
sweetchaos

sweetchaos

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Thread Starter #14
1. Changed From:
How to calculate the preamp gain needed for Amir's posted PEQ filters?
To:
***OPTIONAL*** How to calculate the preamp gain needed for Amir's posted PEQ filters?
You do not need to perform these steps, as I've done it for you.
This is simply for educational purposes, so you understand where preamp gain comes from.

2. Added the Focal Clear Discrepancy Disclaimer.
In the Focal Clear review, Amir incorrectly reported +2dB gain (for 11,319 Hz peaking filter) when he posted the PEQ filters photo.
But in the review, he said "lowering of the peak at 11.3 kHz". This means gain should be -2dB (not +2dB).
My code shows the correct value.
 
OP
sweetchaos

sweetchaos

Major Contributor
Forum Donor
Joined
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Messages
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Location
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Thread Starter #15
Improvements Added:

[For Advanced Users] How to compare multiple PEQ profiles with each other?
1. Let's say you found 3 PEQ profiles online (Amir's and a few others...) for your headphones
2. Import all PEQ profiles into your EQ software
PEQ profile #1:
Preamp: -3.8 dB
Filter 1: ON PK Fc xx Hz Gain x.x dB Q x.x
Filter 2: ON PK Fc xx Hz Gain x.x dB Q x.x
Filter 3: ON PK Fc xx Hz Gain x.x dB Q x.x
PEQ profile #2:
Preamp: -5.4 dB
Filter 1: ON PK Fc xx Hz Gain x.x dB Q x.x
Filter 2: ON PK Fc xx Hz Gain x.x dB Q x.x
Filter 3: ON PK Fc xx Hz Gain x.x dB Q x.x
PEQ profile #3:
Preamp: -4.3 dB
Filter 1: ON PK Fc xx Hz Gain x.x dB Q x.x
Filter 2: ON PK Fc xx Hz Gain x.x dB Q x.x
Filter 3: ON PK Fc xx Hz Gain x.x dB Q x.x
2. To properly compare all PEQ profiles, you'll need to have them level-matched.
To do this, you'll need to set each PEQ profile to have the same preamp, which should be the highest negative preamp gain.
In the example above, a preamp gain of -5.4 dB will need to be manually overridden for PEQ#1 and PEQ#3 profiles.
Save both profiles.
3. Now you can instantly switch between the profiles, to see how the sound changes.
4. After you've found the best sounding PEQ profile, you'll need to revert the preamp gain back to the original.
 
OP
sweetchaos

sweetchaos

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Thread Starter #19
Improvements Added:

[For Advanced Users] What do I do when I have channel-imbalanced headphones?
Some headphones have channel imbalances, where one channel (ex. right) plays at a lower volume than the other channel (ex. left).
Amir makes a note of these channel imbalances in the headphone reviews.
How do you tell if your headphones are channel imbalanced?
Play pink noise for each channel and watch for volume differences, to see if you need to boost the preamp gain on one channel.

Superlux HD668B channel imbalance:
In the Superlux HD668B review, Amir noted a channel imbalance.
He boosted the right channel by +2.5 dB to fix it.
To do this in Equalizer APO, we need to offset the preamp on left channel by 2.5dB.
If you want to try this PEQ profile, use this code instead:

Channel: L
Preamp: -11.0 dB
Filter 1: ON LS Fc 30 Hz Gain 4.0 dB Q 1.0
Filter 2: ON LS Fc 50 Hz Gain 4.0 dB Q 1.0
Filter 3: ON PK Fc 4000 Hz Gain 5.0 dB Q 2.0
Filter 4: ON PK Fc 5380 Hz Gain -7.0 dB Q 6.0
Filter 5: ON PK Fc 8582 Hz Gain -7.0 dB Q 5.0

Channel: R
Preamp: -8.5 dB
Filter 1: ON LS Fc 30 Hz Gain 4.0 dB Q 1.0
Filter 2: ON LS Fc 50 Hz Gain 4.0 dB Q 1.0
Filter 3: ON PK Fc 4000 Hz Gain 5.0 dB Q 2.0
Filter 4: ON PK Fc 5380 Hz Gain -7.0 dB Q 6.0
Filter 5: ON PK Fc 8582 Hz Gain -7.0 dB Q 5.0

Philips Fidelio X2HR channel imbalance:
In the Philips Fidelio X2HR review, Amir noted a channel imbalance.
He boosted the right channel by +1.0 dB to fix it.
To do this in Equalizer APO, we need to offset the preamp on left channel by 1.0dB.
If you want to try this PEQ profile, use this code instead:

Channel: L
Preamp: -4.2 dB
Filter 1: ON LS Fc 40 Hz Gain 3.0 dB Q 1.0
Filter 2: ON PK Fc 277 Hz Gain -1.7 dB Q 4.0
Filter 3: ON PK Fc 1650 Hz Gain -2.0 dB Q 3.0
Filter 4: ON PK Fc 5191 Hz Gain -6.0 dB Q 6.0
Filter 5: ON PK Fc 8200 Hz Gain -2.4 dB Q 5.0
Filter 6: ON HS Fc 12000 Hz Gain -3.0 dB Q 1.0

Channel: R
Preamp: -3.2 dB
Filter 1: ON LS Fc 40 Hz Gain 3.0 dB Q 1.0
Filter 2: ON PK Fc 277 Hz Gain -1.7 dB Q 4.0
Filter 3: ON PK Fc 1650 Hz Gain -2.0 dB Q 3.0
Filter 4: ON PK Fc 5191 Hz Gain -6.0 dB Q 6.0
Filter 5: ON PK Fc 8200 Hz Gain -2.4 dB Q 5.0
Filter 6: ON HS Fc 12000 Hz Gain -3.0 dB Q 1.0
 
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