# Measurement Databases

Below is a collection of several measurement databases and projects, with descriptions and detailed analyses of their pros and cons.

# Squig.link (711)

Arguably the largest collection of measurements (both 711 and 5128), it contains the databases of several people/groups for IEMs, headphones, and earbuds. There are also several useful features, such as the Equalizer tab that allows for many types of EQ, the ability to alter the y-axis, the whole top row, etc. The quality of the measurements is very variable, with some databases having very consistent and thorough procedures and calibrations with the Δ5128 project; others are done inconsistently, with different couplers and units, all jumbled up.

The measurements should only be used with reference with others in the same database.

Pros	Cons
Largest database of measurements	Inconsistent measurement quality and procedure
Feature-packed website	Inconsistent feature implementation
Downloadable measurements

# oratory1990 (711)

Mostly focused on headphone measurements, but IEM measurements are also available and are measured using a HATS. Relatively sparse and measurements are not available for download or modification, but are of very high quality.

Pros	Cons
Very high quality measurements	Measurements only available in PDFs
Some HATS-based measurements	Some HATS-based measurement
Relatively small database

# Hangout.Audio (5128 & 711)

Now part of the squig.link collection, they are the biggest single databases in both of their respective standards. It is also used as a reference for the Δ5128 project. The same features from squig.link are also here as they both use the same software. Measurements are not downloadable and are hosted on their end instead of on squig.link.

Pros	Cons
Generally high quality measurements	Non-downloadable measurements
Large database
Feature-packed website

# Woodenears (5128 & 711)

Measurements using HATS for both frequency response as well as distortion. Everything is in Korean, and the collection is relatively large with slow, inconsistent updates.

Pros	Cons
High quality measurements	Inconsistent and slow updates
Large database	Korean website
Distortion measurements	Non-downloadable measurements
Not many features

# AudioScienceReview (ASR) (711)

Measurements using a HATS for frequency response, distortion, group delay, impedance, and sensitivity. Very limited database, with all of the data shown as pictures.

Pros	Cons
Extensive measurement types	Limited database
Non-downloadable data
No additional features

# Headphones.com (5128 & 711)

Small collection of measurements but spread out across many sources (videos, forums, websites, etc) with no consistent method of searching them. Large variety in terms of presentation, measurement rig, and procedure. Most new measurements are compensated to a specific curve/target, and some display insertion depth profile.

Pros	Cons
High quality measurements	Compensated measurements
HATS-based measurement	HATS-based measurement
Different measurement types	Hard to find measurements
Non-downloadable data
Inconsistent measurement procedures and rigs

# Earphones Archive (5128 & 711)

Relatively small collection of 5128 measurements. Additional data can be found on their blog.

Pros	Cons
HATS-based measurement	HATS-based measurement
Relatively large 5128 database	Korean website
Extensive measurement types
(Indirectly) Downloadable data

# Realab (5128)

Small collection of high quality measurements for IEMs in Chinese.

Pros	Cons
HATS-based measurement	HATS-based measurement
Different measurement types	Non-downloadable data
Hard to find measurements
Chinese website
Limited database

# HypeTheSonics (5128 & 711)

Small collection of IEM (5128 & 711) and DAP measurements. They are also responsible for the coupler research project with the ER2SE.

Pros	Cons
High quality measurements	Limited database
HATS-based measurement	HATS-based measurement
Different measurement types	Non-downloadable data
Other databases and projects

# Rtings (5128 & 711)

Very large collection of measurements in both 711 and 5128. High quality measurements, but some tests and every score must be ignored.

Pros	Cons
High quality measurements	Compensated measurements
HATS-based measurement	HATS-based measurement
Different measurement types	Non-downloadable data
Large database

# Soundguys (5128 & 711)

Large overall collection, but very little IEM measurements in favor of headphones and TWS. 5128 measurements present but even smaller smaller collection of measurements. Scores should be ignored.

Pros	Cons
Different measurement types	Compensated measurements
HATS-based measurement	HATS-based measurement
Non-downloadable data
Inconsistent measurement procedures and rigs

# PEQdB (5128 & 711)

A scrape of available measurements from squig.link, but without any of the categorization or separation. To be avoided for the most part as other measurement are as accessible while still being traceable.

Pros	Cons
Large database	Extremely inconsistent measurement quality and procedure
Downloadable measurements
Feature-packed website