Turntable Channel Separation: What the Spec Means

What is channel separation in a phono cartridge?

A record groove is cut with two walls at 45 degrees, one for the left channel and one for the right. The stylus moves in two axes, and the cartridge's internal magnets or coils convert those movements into separate electrical signals. Channel separation, also called stereo separation, is the ratio of the wanted signal in one channel to the crosstalk leaking over from the other channel. It is measured in decibels, and a higher number indicates better isolation.

In practice, perfect separation is impossible because of the physical geometry of the stylus and the groove. Some crosstalk always exists. The spec tells you how much of the opposite channel's signal bleeds through. If separation is poor, sounds that should be only on the left speaker also appear on the right, which muddies the stereo image.

• Channel separation is expressed in decibels (dB).
• It is measured at a specific frequency, often 1 kHz, but it can vary across the audio band.
• A higher dB number means less crosstalk and better separation.

Why channel separation matters for stereo imaging

Stereo imaging is your perception of where instruments and vocals sit in space. A well-separated cartridge keeps left-channel information firmly on the left and right-channel information on the right. This creates a wide, open soundstage with a clear center image. When separation is low, the channels blend together, and the soundstage narrows. You may hear a 'hole in the middle' or a vague, diffused image.

Separation also affects depth and ambience. Reverb and room cues are often recorded at different levels in each channel. If crosstalk is high, those cues become blurred, reducing the sense of space. For classical and acoustic recordings, where the placement of each instrument is part of the musical experience, good separation is especially noticeable.

What values are good?

Manufacturers often list channel separation in a cartridge's specification sheet. The number itself, however, is not the only sign of quality. Separation can vary with frequency; it tends to be higher in the midrange and lower at the very top and bottom of the audible range. A spec quoted at 1 kHz is a useful reference, but it does not tell you how the cartridge behaves at 10 kHz.

Instead of chasing a specific number, focus on the overall performance. A cartridge with separation of, say, 25 dB may sound fine if its frequency response is well balanced. A cartridge with 35 dB might still be disappointing if other factors, such as tracking ability, are poor. The best approach is to listen for clear channel separation: if you can pinpoint instruments without strain, the cartridge is doing its job.

How to get the most from your cartridge's separation

Channel separation is partly determined by the cartridge design, but setup and maintenance play a role. Proper alignment of the cartridge in the headshell ensures the stylus sits correctly in the groove, which minimizes crosstalk. Follow a good alignment guide, like our cartridge alignment guide, to get the angles right.

Tracking force and antiskating also affect the stylus's contact with both groove walls. If the vertically applied force is off, one wall may be tracked more heavily, increasing crosstalk. Adjust the counterweight and antiskating according to the cartridge's recommended settings. See how to set turntable counterweight and what is antiskating for details.

A clean stylus and clean records are essential. Dust and debris between the stylus and groove can cause uneven contact and increase crosstalk. The Library of Congress recommends keeping playback equipment clean and well maintained, and that includes the stylus and record surfaces. Refer to how to clean turntable stylus and how to clean vinyl records for safe methods.

Choosing a turntable with good channel separation

Channel separation is a cartridge spec, so when you choose a turntable, you are indirectly choosing its cartridge. Many turntables ship with a moving magnet cartridge, which typically offers adequate separation for most listeners. If you want to guarantee a high level of separation, look for models that list the spec in their documentation, or consider upgrading the cartridge later. Our cartridge upgrade guide can help you decide.

If you listen mainly to mono recordings, channel separation matters less. For stereo music, especially with complex arrangements, prioritize a cartridge with a solid specification. Keep in mind that the phono preamp can also influence the final signal, but separation is primarily a cartridge attribute.

What to pick for your use

Questions

Is higher channel separation always better?

Not necessarily. Extremely high separation numbers can sometimes indicate a cartridge that sounds overly 'stereo' or artificial. The goal is to achieve a natural, cohesive soundstage. In practice, most well-designed moving magnet cartridges provide separation that is more than adequate for music listening, as long as the cartridge tracks well and the system is properly set up.

What is a good channel separation number?

Manufacturers often list separation in decibels, but there is no universal 'good' cutoff. A useful rule is to look for a cartridge that lists a separation figure at all. If the number is not published, the maker may not prioritize the spec. The most reliable way to judge is by listening: if the stereo image sounds wide and clear, the separation is fine.

Does channel separation affect mono records?

Mono records are cut with the same signal in both channels, so separation does not directly affect the mono playback. However, if a mono record is played with a stereo cartridge, poor separation can cause slight phase differences, but this is rarely a problem. The main concern for mono records is vertical tracking and cartridge compliance, not separation.

Can I improve channel separation by adjusting my turntable?

Yes, setup can reduce crosstalk. Make sure the cartridge is aligned, the tracking force is correct, and the antiskating is set. Also keep the stylus clean. These adjustments ensure the stylus tracks both groove walls symmetrically, which minimizes leakage between channels.