Audio-Technica AT-CAP4 Multi-Function Cartridge Alignment Stroboscope Disc

The Audio-Technica AT-CAP4 Multi-Function Cartridge Alignment + Stroboscope Disc is a versatile two-sided turntable setup tool designed to help vinyl listeners, hi-fi enthusiasts, and turntable owners fine-tune their playback system with greater accuracy. Built for cartridge alignment, overhang adjustment, null point setup, and platter speed calibration, the AT-CAP4 provides multiple essential turntable setup functions in one convenient disc.

One side of the AT-CAP4 is dedicated to cartridge alignment and overhang adjustment. The overhang adjustment section helps set the correct distance between the stylus tip and the turntable spindle, with a 0.39" to 0.79" adjustment range depending on the turntable’s specifications. Proper overhang setup is important for improving tracking accuracy, reducing playback distortion, and helping the stylus follow the record groove more consistently from the outer edge to the inner grooves.

The cartridge alignment side also includes null points for four different alignment geometries: Baerwald, Stevenson, Löfgren B, and UNI-DIN. These alignment options allow users to choose a geometry that best fits their tonearm’s effective length and listening priorities. Whether the goal is balanced performance across many music genres, reduced distortion near the label, improved sound quality across most of the record surface, or optimized playback for modern pop and rock records, the AT-CAP4 gives users flexible alignment reference points.

The opposite side of the disc functions as a stroboscope for calibrating turntable platter speed. It supports 33-1/3, 45, and 78 RPM speed calibration at both 50 Hz and 60 Hz. When used with an incandescent or strobe light, the stroboscope pattern helps verify whether the platter is rotating at the correct speed, making the AT-CAP4 a helpful accessory for maintaining accurate pitch, stable playback, and dependable turntable performance.

Key Features

• Versatile two-sided turntable setup disc for cartridge alignment, overhang adjustment, and platter speed calibration
• Cartridge alignment side includes an overhang adjustment section for setting stylus-to-spindle distance
• Supports overhang adjustment from 0.39" to 0.79", depending on turntable specifications
• Includes null points for Baerwald, Stevenson, Löfgren B, and UNI-DIN alignment geometries
• Baerwald alignment is ideal for listeners who want versatile performance across a wide range of genres
• Stevenson alignment is useful for classical, jazz, or records with critical content closer to the label
• Löfgren B alignment prioritizes sound quality across most of the record surface
• UNI-DIN alignment is suited for modern music such as pop and rock with critical content in the mid-to-inner grooves
• Stroboscope side calibrates 33-1/3, 45, and 78 RPM platter speeds at 50 Hz or 60 Hz
• Proper cartridge alignment helps support optimal tracking, minimal distortion, and even record wear

Technical Specifications

Product Type: Multi-function cartridge alignment and stroboscope disc
Model: AT-CAP4
Disc Design: Two-sided setup disc
Side 1 Function: Cartridge alignment and overhang adjustment
Side 2 Function: Turntable platter speed calibration stroboscope
Overhang Adjustment Range: 0.39" to 0.79"
Alignment Geometries: Baerwald, Stevenson, Löfgren B, UNI-DIN
Baerwald Effective Tonearm Length: 8.74" to 9.84"
Stevenson Effective Tonearm Length: 7.87" to 9.06"
Löfgren B Effective Tonearm Length: 8.74" to 9.84"
UNI-DIN Effective Tonearm Length: 8.66" to 9.45"
Supported Platter Speeds: 33-1/3 RPM, 45 RPM, 78 RPM
Supported Frequency Calibration: 50 Hz and 60 Hz
Required Light Source for Stroboscope: Incandescent or strobe light, not included
Primary Use: Cartridge overhang adjustment, cartridge offset setup, null point alignment, and turntable speed calibration

What’s Included

Audio-Technica AT-CAP4 Multi-Function Cartridge Alignment + Stroboscope Disc