An XLR cable tester shows whether each pin of a microphone or line cable is wired through, and some units add a tone, a phantom power check or a level meter. Simple testers use LEDs, while larger ones cover several connector types.
The six testers below range from a pocket sender to units that also produce a test tone. Features come from each listing page. We have not used these testers ourselves, and accuracy claims are the makers’ own.
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What to Look For
| Feature | Why it matters |
|---|---|
| Connectors | XLR only, or XLR plus TRS, RCA and MIDI |
| Test tone | A tone helps trace a signal path through a mixer |
| Phantom power check | Some units read the 48V on pins 2 and 3 |
| Single-person use | A remote end lets one person test a long run |
Specs at a Glance
| Tester | Connectors | Extras | Notes |
|---|---|---|---|
| Behringer CT100 | XLR, TRS, RCA, MIDI | Test tone; phantom check | Battery powered; 13.76 oz |
| SoundTools Sniffer/Sender | XLR and 3-pin DMX | LED feedback; remote end | Aluminum housing; pocket size |
| Xvive AT-2 Pro | XLR, plus other outputs | 1 kHz tone; pink noise; 48V check; meter | USB-C rechargeable; headphone monitor |
| Xvive AT-1 | XLR, 1/4 in, 3.5 mm outputs | 1 kHz tone; pink noise; 48V check; meter | Automatic pin-by-pin test |
| dbx CT-3 | Up to 8-pin cables | Test tone; two-piece chassis | 2.2 lb |
| Whirlwind Qbox | XLR, TT Bantam in; XLR, 1/4 in out | Tone; 950/20k ohm output | 16 oz; 9V battery eliminator |
The 6 Best XLR Cable Testers
1. Behringer CT100 6-in-1
A microprocessor-controlled tester with three modes: cable, installed cable and test tone. It accepts XLR, TRS in 1/4 inch, 1/8 inch and TT sizes, RCA and MIDI, shows results on an LED display, checks continuity and intermittent contact, and checks phantom power and ground shield. The listing gives battery power and a weight of 13.76 ounces.
Suits: a mixed bag of cable types. Strengths: many connectors and a phantom check. Weaknesses: no size is listed. Skip it if you only need an XLR check.
View Behringer CABLE TESTER CT100 Professional 6-in-1 Cable Tester on Amazon
2. SoundTools XLR Sniffer/Sender
A pocket-size tester for XLR and 3-pin DMX cables with LED feedback. A remote-end unit lets one person check a cable run alone, and the maker describes a rugged aluminum housing for stage and studio use.
Suits: quick checks on stage. Strengths: solo operation and a small size. Weaknesses: no tone or power check is listed. Skip it if you want a signal source.
3. Xvive AT-2 Audio Tester Pro
A five-in-one unit with a 1 kHz tone and pink noise, three output levels of -10, -20 and -40 dB, an XLR cable tester, a 48V phantom power checker, an XLR input meter and a headphone and built-in speaker monitor. It charges over USB-C. The maker says a solid light means 44 to 52V and a flashing light means 24 to 44V.
Suits: tracing a signal through a PA. Strengths: tone, meter and a rechargeable battery. Weaknesses: more controls than a basic tester. Skip it if you only want pin checks.
4. Xvive AT-1 Portable Audio Tester
A portable tester with a 1 kHz sine wave or pink noise sent out over XLR, 1/4 inch or 3.5 mm connectors at -10, -20 or -40 dB. It checks XLR cables pin by pin when you hold the SEL button for two seconds, checks phantom power, meters input level and has a headphone monitor.
Suits: a compact all-round tester. Strengths: three output connectors and a pin-by-pin test. Weaknesses: no rechargeable battery is stated in the part we read. Skip it if you want the newer AT-2 features.
5. dbx CT-3 Advanced Cable Tester
A tester for cables up to 8 pins with a two-piece chassis for checking installed cables, a test tone generator and easy connection between different connector formats. It weighs 2.2 pounds and the power field reads corded electric.
Suits: installed cable runs. Strengths: a two-piece design and 8-pin support. Weaknesses: heavier than pocket units. Skip it if you carry gear in a small bag.
View dbx CT-3 Advanced Cable Tester, Black on Amazon
6. Whirlwind Qbox Audio Line Tester
A compact tester and tone source with XLR and TT Bantam inputs and XLR, 1/4 inch unbalanced and stereo outputs. It lists selectable output impedance of 950 ohms or 20 kilohms and 60 dB of gain. The power field says battery powered while a bullet mentions a 9V battery eliminator, and the weight is 16 ounces.
Suits: tracing a line with a tone. Strengths: impedance choice and gain. Weaknesses: mixed power wording. Skip it if you want a simple pin check.
View Whirlwind Qbox Audio Line Tester/Cable/Test Tone Generator on Amazon
Using a Tester
- Plug both ends of the cable in before you read the LEDs.
- Flex the cable along its length to look for intermittent faults.
- Label any cable that fails and set it aside.
- Keep fresh batteries on hand for battery-powered units.
Mistakes to Avoid
- Buying a multi-connector unit when you only use XLR.
- Assuming a pass means a cable is quiet.
- Forgetting that a phantom power check needs the right connection.
- Ignoring conflicting power wording in a listing.
XLR Cable Testers FAQ
Which testers check phantom power?
The Behringer CT100, Xvive AT-2 and Xvive AT-1 list a phantom power check.
Which tester can one person use alone?
The SoundTools Sniffer/Sender lists a remote end for solo checks.
The Short Version
For many connectors, the Behringer CT100. For a pocket check, the SoundTools. For tone and a rechargeable unit, the Xvive AT-2. For a compact tone source, the Xvive AT-1. For installed runs, the dbx CT-3. For impedance choice, the Whirlwind Qbox.
