UAD Plug-Ins

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Additional UAD Plug-In Latency

Some UAD plug-ins introduce additional latency within the plug-in itself (in addition to hardware I/O buffering latency) to achieve sonic design goals. When these plug-ins are used in a DAW and/or Apollo’s Console, the additional latency is induced in the signal path. Therefore, they require more compensation to remain perfectly synchronized with other tracks, versus UAD plug-ins that do not have additional latency.

Note: Compensating for the additional latency from these UAD plug-ins is performed automatically by the host software application (DAW and/or Apollo’s Console) when the latency delay compensation function is enabled in the host.

Although the latency added by these UAD plug-ins is negligible (typically between 0 – 100 samples, depending on the plug-in and session sample rate), if this extra latency is not compensated, it can affect phase coherency in a session.

The additional latency values, in samples, of UAD plug-ins with additional latency are listed in the tables below for the benefit of users with plug-in host DAWs that do not perform automatic delay compensation.

For related information, see the “Latency & Delay Compensation” chapter in the UAD System Manual, and the “Latency & Apollo” chapter in the Apollo Software Manuals.

EMT 250 and Lexicon Notes

The EMT 250, Lexicon 224, and Lexicon 480L anti-aliasing filters for their A/D and D/A conversion are not linear-phase filters; therefore the emulations do not have a latency that is the same at all frequencies. Thus, they cannot report to the delay compensation engines a delay that is correct for all frequencies. The reported values are good at low frequencies, but become off at high frequencies.

For example, when the EMT 250 plug-in is in Delay program mode and set with zero delay time and predelay values, the plug-in output will not be completely cancelled when mixing with inverted polarity against an unprocessed track; high frequencies will leak through. However, the latency through the dry side of the wet/dry mix, and the latency when the plug-in is bypassed via the EMT 250 Power switch, do not have this issue and will be fully compensated by the DAW.

Additional UAD Latency Values Table

UAD Plug-In Sample Rate (kHz)
44.1 48 88.2 96 176.4 192


API 560 EQ

API 2500

API Preamp

API Vision Channel Strip

API Vision Channel Strip Legacy

Avalon VT-737sp Channel Strip

Century Tube Channel Strip

Empirical Labs Distressor

Empirical Labs FATSO Jr./Sr.

Fairchild 660

Fairchild 670

Helios Type 69

Hitsville EQ

Hitsville EQ Mastering

Manley Massive Passive

Manley Reference Microphone Preamplifier

Manley Variable Mu


Moog Multimode Filter

Moog Multimode Filter XL

Neve 1073

Neve 1084

Neve 2254 E

Neve 2254 E Dual

Neve 33609 C

Neve 88RS

Neve Preamp

Oxide Tape

Precision Maximizer

Pultec EQP-1A

Pultec MEQ-5

Studer A800

SSL 4000 E Preamp & Channel Strip

SSL G Bus Compressor

Thermionic Culture Vulture

UA 610-A

UA 610-B

UA 1176 Rev A

UA 1176AE

UA 1176LN Rev E

UA 175B

UA 176

V76 Preamp

55 55 88

Helios Type 69

Harrison 32C

Neve 1073 Legacy

Neve 1081

Neve 31102

Precision EQ

Pultiec EQP-1A Legacy

Pultec-Pro Legacy

Pultec HLF-3C

SSL E Channel Strip Legacy

Trident A-Range

31 13 0

Teletronix LA-2

Teletronix LA-2A

Teletronix LA-2A Gray

Teletronix LA-2A Silver

56 56 89

Capitol Chambers

Hitsville Reverb Chambers

320 752 1504
Bermuda Triangle 88 80 20
Fender ‘55 Tweed Deluxe 119 201 284

Ibanez Tube Screamer TS808

TS Overdrive

88 80 0
Korg SDD-3000 Delay 119 183 344
Little Labs IBP 32 14 1
MXR Flanger/Doubler 31 0 0
Ocean Way Studios 192 688 1568
Raw Distortion 44 40 0
AKG BX 20 983 974 2078 2060 4156 4120
Ampex ATR-102 2262 2455 4408 4798 8818 9598
Precision Limiter 64 69 129 140 259 281
Precision Multiband 15,360 16,896 30,720 33,792 61,440 66,048
Lexicon 224 (see note at the beginning of article) 84 79 90 97 107 116
EMT 250 (see notes) 75 11 85 24 107 50
Lexicon 480L (see note at the beginning of article) 121 64 177 174 289 284