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Simolio SM-621D Wireless TV Speaker Review

Simiolio SM-621D

Simolio SM 621D
Frequency Range:Headphones:Battery:
100 FeetYes6 Hours

The SM-621D Wireless TV Speaker from Simolio is a fantastic aid for hearing-impaired people. It enables the user to hear the dialogue of their preferred television programs more clearly without upsetting the peace in the home. Additionally, it functions admirably as a wireless headphone connection. You’re better off purchasing a speaker designed specifically for playing back high-quality music rather than a wireless speaker with a limited listening area.

Simoilio (also known as Shenzhen Simolio Electronic Co., Ltd.) manufactures audio products with a focus on hearing aids for the deaf. Despite this, many people may benefit from their products and find them useful in their daily lives. Their products aren’t just appropriate for the elderly or the hearing impaired.

The Simolio SM-621D Wireless TV Speaker is a clever product that enables users to wirelessly monitor the audio from up to 100 feet away by connecting a base station to their television’s audio output. This applies to all audio players with compatible output connections, not just televisions.

Other items from Simolio include the SM-825D Pro Voice Enhanced TV Headphones, which perform functions very similar to those of the SM-621D but only output to headphones.


A base station and a detachable set-top speaker make up the Simolio SM-621D, a reasonably small set. It is available in black and blue. The base station is made entirely of black plastic and has a status LED on the front for both colors.

The speaker is primarily made of black plastic and has a gray (for the black model) or navy blue (for the blue model) mesh speaker covering. A status LED is also located on the front of the speaker, just below the mesh. On the black model, the Simolio name is displayed above the speaker mesh in white; on the blue model, it is displayed in white with a red background.

Two block guides, one of which houses the charging connection, help the speaker fit snugly onto the base station. The power and audio connection options are located on the back of both the base station and the speaker.

With the base station’s speaker installed, the device is just under 11 inches tall. The speaker weighs slightly less than 3 pounds, which is light for its size.

Simolio SM 621D Label


With its 2,4GHz wireless link, the Simolio SM-621D’s base station and speaker can be 100 feet apart without experiencing any signal loss. To ensure minimal interference, Automatic Frequency Hopping Spread Spectrum (FHSS) technology is used, enabling two units to be used simultaneously at a minimum distance of 30 feet.

The base station comes with two cables that enable stereo RCA and 1/8-inch AUX connections to your television or audio device. The base station’s audio connections also offer a 1/8-inch AUX input. An optical connection is available with an optical cable if you need to connect a digital device to the base station. Remember that only PCM audio streams are supported by this digital connection, so check the specifications of your audio device to see if it is compatible.

Audio connections on the wireless speaker are 1/8-inch AUX input and output. The speaker is muted when the output AUX is connected. When others nearby don’t want to be disturbed, this output is designed to connect to headphones for listening. You can connect your phone or other nearby devices to the speaker using the AUX input.

It is fairly simple to power the units because it includes two identical power supplies: one for the base station and one for the speaker. Depending on the output level, the speaker has a battery compartment that houses a replaceable Lithium-Ion battery that enables the speaker to operate remotely for up to 6 hours. By mounting the battery on the base station or remotely connecting it to the power source, the battery reaches its maximum capacity in 3 hours.

The large volume knob on the front of the speaker, which also functions as the power button, controls the volume once an audio source is connected to the base station or the AUX input. The speaker has additional audio level control built in for safety, but it cannot be adjusted by the user. This “Automatic Signal Control (ASC)” audio-level limiting circuit.

Any loud noises, such as plugging input connectors into the base station or speaker while it is in use, will be controlled. Additionally, it will somewhat lessen program-level changes, though I doubt this will be very effective if the commercial breaks are significantly louder than the program’s actual content.

The user can choose between the Treble, Normal, and Bass EQ settings because this speaker was created for people who have hearing loss. Depending on the user’s hearing impairment, high or low frequencies can be compensated. The SM-621D also has “Voice Highlighting Tech,” which raises the dialog level of the content for easier comprehension. While the voice highlighting is not user-controllable, the EQ is, so this could be a drawback if you want to use this speaker for music listening.

Battery and Power

Having a speaker that can be powered by a connected power supply or by a battery is convenient, but it could also create dangerous circumstances. For safe and extended use, lithium-ion batteries prefer to be handled in a specific way.

A Lithium-Ion battery’s lifespan is shortened and it runs the risk of overheating and bursting if it is kept charged after it has used up all of its capacity. How can you prevent this from happening since it would be a very unpleasant and possibly dangerous thing to do?

The first option is to completely remove the speaker’s battery and only use the main power supply to power it. Yes, it reduces the unit’s portability, but if that sounds too constrained, there is an alternative. The second option is to leave the battery in the device, but develop the habit of only turning it on for about 2.5 hours (80%) at a time and never letting it completely discharge (20%). Since the device lacks a battery meter, this will largely be a guessing game.

This issue is not specific to the SM-621D; rather, it affects many electronic devices that lack microcontrollers that regulate the battery’s charge, as do the majority of contemporary cell phones.

2,4GHz Wireless

The connection between the base station and the speaker may be interfered with or cut off by Bluetooth and WiFi, which both operate in the 2,4GHz band.

It is important to take precautions when establishing WiFi connections with smart televisions to avoid placing the transmitter in close proximity to or between the WiFi router and the television. The same would hold true for any nearby Bluetooth connections.

Other Devices

The level and processing controls that each audio device has may or may not have an impact on the output connections. Make sure the playback device (such as a television, DVD player, or computer) is not processing anything and that the output level is not lowered in order to guarantee that the Simolio SM-621D receives decent audio levels and quality.

The built-in speakers on some televisions can be configured to turn off when an external output is selected. You will have to mute the speakers or lower the volume to zero if this is not an option. The audio output of some older televisions might be connected to the volume of the built-in speakers, so if you lower the volume or mute the speakers, the SM-621D will also be impacted.

To guarantee that you can send a clear, unaltered signal to the base station, you must carefully read the technical manual for your device.

Simolio SM-621D Vs Pyle PTVSP18BK

Simolio SM 621D Compare
Pyle Ptvsp18BK
Simolio SM-621DFeaturesPyle PTVSP18BK
2,4GHzWireless Band2,4GHz
⅛-inch AUXAnalog Inputs⅛-inch AUX
⅛-inch AUXAnalog Outputs⅛-inch AUX
Optical (PCM)Digital InputsNo
YesVoice ClarifyingNo
10in x 9in x 4inDimensions (H x W x D)8in x 8in x 2.9in

The Pyle PTVSP18BK is an alternative to the SM-621D. Compared to the SM-621D and the, the Pyle PTVSP is a little more expensive.

The direct analog connections are the same for the Pyle and Simolio SM-621D. The onboard connections don’t matter as much in this situation because the SM-621D comes with converter cables. There is no competition because every unit has a 1/8-inch AUX output for headphones. The Pyle PTVSP is the only device that does not accept a digital input.

Unlike the other units, the Pyle unit does not use voice clarification technology. This distinguishes the Pyle from the other two as a potential high-quality music listening device. The Pyle does not come with batteries, but the Simolio SM-621D does. Depending on the quality of the battery you’re considering, this could end up saving you quite a bit of money.

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