5 Best Contact Microphone | Hear The Wood, Not The Pickup

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Six stick-on sensors for less than most single pickups cost.

Fitting one pickup to one guitar is fine until you have three instruments and a gig bag. This pack gives you six sensors, each with its own 1/4″ output jack and 11.6-inch reinforced cable, so you can leave one in the ukulele, one on the banjo, one in the mandolin case, and still have spares. At 2.88 ounces for the whole set, it’s the lightest kit here by a wide margin — the 3-head alternative weighs 8.4 ounces. Nothing to solder, no battery to replace, and industrial-grade double-sided tape does the mounting.

Buyer reports are consistently positive. The soprano uke gave full sound without muting acoustics or losing low end, as buyers report, which is the exact thing a badly matched piezo usually ruins. There’s no feedback and no hum on the reported setups, and the tape leaves little residue when you peel it off. A lot of buyers describe getting usable results on guitar and strings straight away, then improving them noticeably with EQ or a compressor.

Read the fine print on impedance before you judge these. They want a high-impedance input — a pedal, preamp, DI, or the instrument input on an amp — and will sound weak and noisy into a straight line or mic channel. The adhesive is genuinely strong, which cuts both ways: it holds beautifully, but it can lift a delicate finish, so test on a hidden spot first. On tongue drums, response is reported as less convincing than on strings.

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A three-head rig that shines on a cheap guitar and stumbles on a good one.

The pitch is simple: three piezo heads on a 1/4″ jack, mounted with green glue or 3M stickers, and not a battery or solder joint in sight. For a church guitar or a beater classical, that’s a sensible proposition — one buyer fitted it to a budget acoustic, upgraded the bridge bone, and came away impressed enough to plan a second purchase for an old classical. Someone else installed it with zero prior experience and had it working quickly.

It performs best on a mid-range acoustic with a solid top. Fitted externally to an Ovation Custom Balladeer, it produced loud, clear output that one player compared to active pickups — no preamp involved. Build quality feels solid, the pickup bodies are thick 1/4″ units, and the kit even includes a faux-leather strap-pin pouch so you can mount without touching the finish. The reversible green putty is genuinely useful for auditioning placement.

The instructions are poorly written and give no real placement guidance, so you’re experimenting blind. Alone, the signal is weak — a preamp makes a large difference, and one player found an iRig Pre 2 transformed it. Low end comes through thin. The heads also pick up handling contact as static noise, so play clean. It’s a solid value that asks more of you than the pricier kits.

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The one you can move between a dulcimer, a banjo and a guitalele in one afternoon.

Some instruments have no sensible place to fit a pickup. A lap dulcimer, a mountain dulcimer, a small soundhole you can barely reach — that’s the KNA AP-1’s territory. The sensor sits inside a maple wood enclosure and attaches with reusable putty or double-sided adhesive discs, so nothing gets drilled and nothing gets permanently altered. The cable detaches, runs 8 feet, and terminates in 1/4″ to 1/8″ jacks, which covers an amp, a PA, or a recording interface. It weighs 3.2 ounces, light enough to leave clipped in place.

What it does best is bring an odd instrument to the front of the mix without touching it. Owners mention it amplifying small, irregular soundholes loudly and accurately, which is precisely where clip-on pickups fall down. The maple body takes the brittle edge off the top end — one player found it dampened annoying high-frequency noise and string squeaks, leaving a cleaner tone. On a Yamaha guitalele it reportedly works far better than you’d expect for the size.

Setup rewards attention. Placement is critical — the best spot tends to sit between the bridge and tail block, off-centre near the bridge, with the jack angled so the cable hangs straight. Some owners ditch the included adhesive dots as too treble-heavy and swap in museum putty for a neutral tone. The generous negatives in the feedback are adhesive and durability, so plan for your own mounting solution. One buyer also expected volume controls that aren’t there, and found it didn’t cut through a loud jam session.

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The end-pin jack and step-by-step manual that turn a pickup into a permanent install.

This is the one you fit to a guitar you intend to keep. Three hand-wired transducers feed a 1/4″ end-pin jack — the same socket your strap button screws into — so the whole system disappears inside the body and looks factory. No soldering, no battery, and the package includes a detailed step-by-step manual plus a fitting accessory pack. It senses the soundboard’s vibrations directly and is described as completely insensitive to air vibrations, which is why feedback stays manageable on a loud stage.

Owners with serious instruments keep coming back to the tone. Fitted to a ’60s Gibson J50 and pushed through a PA, the plugged-in sound reportedly matched the acoustic sound exactly, with no feedback or rattle. A 1975 Alvarez-Yairi dreadnought got one too, after the owner weighed it against a pricier name-brand option and chose this instead — the installing luthier was impressed by the result through a high-end amp. One long-time player compared it to a well-known premium system and suggested they might share a manufacturer.

This is the most demanding install on the list. You need to drill the end-pin hole yourself, and the instructions, while present, are described as vague on the illustrations. It also costs the most here. If you’re not confident with a drill, budget for a luthier’s labour. That said, the result on a fine guitar justifies it — the passive design keeps the signal pure and the tone uncoloured.