RadioShack Omnidirectional Microphones: Buying Guide

RadioShack sold many small microphones over the years, often under the RadioShack or Realistic names, and many are now bought as used or leftover stock. An omnidirectional model picks up sound from all directions. That helps in some situations and hurts in others. This guide shows how to decide whether one fits your setup and what to confirm before you buy.

Start with the intended use

Decide what you will record and where. An omnidirectional pattern suits a speaker who moves their head, a clip-on mic on clothing, or a mic in the middle of a table capturing several people. Because it does not reject sound from the sides or rear, it also captures room echo, fans, keyboards and other background noise. In a noisy room or a shared space, a directional microphone may be the better choice.

• Environment: a quiet room, an echoey room, outdoors, or a shared office.
• Source: one voice close to the mic, several people around a table, or general room sound.
• Connection: the device you will plug into, such as a computer, phone, camera, portable recorder or mixer.
• Constraints: cable length, mounting (clip, stand or table), and whether you can supply battery power.
• Result: a video call, a voice recording, a video soundtrack or live amplification.

Features that matter

Read the packaging, manual or listing for each item below. These are specifications, not measured quality scores. Two mics with similar numbers can still sound different in your room.

• Microphone type: many small RadioShack mics are electret condensers. These need power from a battery or from the input they plug into. Dynamic mics need no power.
• Form factor: tie-clip (lavalier), handheld, desk-stand and boundary styles. Boundary mics lie flat on a table and are meant for group pickup.
• Impedance: older mics are often labelled high or low impedance. Match this to what your recorder, mixer or interface expects.
• Frequency response: a published range describes what the maker specifies, not how the mic will sound in your space.
• Power: check for a battery compartment and an on/off switch. A switch left on can drain the battery.
• Cable and connector: note the plug type and cable length, and whether the cable is fixed or detachable.
• Condition: for used units, check the cable, plug, clip and battery contacts for damage or corrosion.

Check compatibility

Most compatibility problems come from the connector and power, not the microphone itself. The microphone is analog. Settings such as sample rate are set by your computer, recorder or audio interface, not by the mic.

• 3.5 mm plugs: a mic plug with three contacts (TRS) may not work in a laptop or phone headset jack with four contacts (TRRS) without the correct adapter. Check which type each side uses.
• 6.35 mm (1/4 inch) plugs: common on older mixers and amplifiers. Computers and phones need an adapter or an audio interface.
• XLR plugs: these need an XLR input on a mixer, recorder or USB audio interface. Check whether the interface supplies the type of power the mic needs, if any.
• Plug-in power: some computer and recorder inputs supply a small voltage for electret mics. If your input does not, use a mic with its own battery.
• Phones and tablets: confirm that the device accepts an external analog mic through its port or an adapter. Some require a specific adapter type.
• Operating system and apps: after connecting, select the mic as the input device in system sound settings and in your call or recording app. Also confirm the correct output device so you can monitor the result.

Once connected, make a short test recording. Set the input level so normal speech registers clearly without clipping at loud moments. Then listen back for hum, crackle or heavy room noise.

Build a shortlist

Use this checklist to filter listings or stock. Keep a mic on the shortlist only if it passes every item that applies to your setup.

• The omnidirectional pattern suits your room and source; you are not trying to isolate one voice in a noisy space.
• The form factor matches how you will mount it: clip, hand, stand or table.
• The plug matches your input, or you have identified the exact adapter or interface you need.
• The power requirement is covered by a battery or by plug-in power from your device.
• The impedance is suitable for your recorder, mixer or interface.
• The cable is long enough for your position without straining the connector.
• For used units, the listing shows or describes the condition of the cable, plug and battery compartment, and the seller states whether the mic was tested.
• The return terms allow you to test it with your own device and app.

If no option passes the connector and power checks without a chain of adapters, consider a current microphone made for your device. A USB mic connects directly to a computer, and a TRRS mic is built for phones. Either removes the most common points of failure.