# Measurement Databases

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

WIP

# 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 collection of measurements	Inconsistent measurement quality and procedure
Feature-packed site	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 avaiable in PDFs
HATS-based measurement	HATS-based measurement
Relatively sparse collection

# 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
High quality measurements	Non-downloadable measurements
Large collection

# 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 collection	Korean site
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)

# Earphones Archive (5128 & 711)

# Realab (5128)

# HypeTheSonics (5128 & 711)

# Rtings (711)

# Soundguys (5128 & 711)

# 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.