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Your cart is empty. The X21 is a stereo two channel passive mixer for expanding a console mixer, mixing instruments, cd players, cassette players, computers etc.
It requires no batteries or other power source.
The unit may also be used as a 1 in 2 out stereo splitter box when all controls are turned completely clockwise
2 Stereo 3.5mm Inputs
1 Stereo 3.5mm Output
Package contains:
X21 audio mixer x1
J
Reviewed in the United States on January 14, 2025
This thing passively sums two audio sources together and has an attenuator knob for each source. There is of course no gain, the knobs simply attenuate the volume. Summing two audio sources together passively, you're going to lose volume, and this thing lost me a lot of volume. My headphone amp has more than too much gain, and with my signal hitting this mixer first, I just barely don't have enough. Removing the second source gives you some gain back, but what's the point of that? For what this thing is it works fine, you should expect some volume loss summing two sources passively.My issue is that there are four random DIP switches in-between the two knobs. Not documented in the packaging, not even pictured anywhere on any product page, and I have no clue what they do. Above all four it says "1k" and below them it says "4k7". I suppose that's probably referring to different resistors? Flipping the first switch upwards seems to increase the volume, flipping the last one seems to as well, the middle two I have no clue. Doesn't look like it's "1 left 1 right 2 left 2 right" so I've got no clue lol.
J
Reviewed in the United States on January 14, 2025
This thing passively sums two audio sources together and has an attenuator knob for each source. There is of course no gain, the knobs simply attenuate the volume. Summing two audio sources together passively, you're going to lose volume, and this thing lost me a lot of volume. My headphone amp has more than too much gain, and with my signal hitting this mixer first, I just barely don't have enough. Removing the second source gives you some gain back, but what's the point of that? For what this thing is it works fine, you should expect some volume loss summing two sources passively.My issue is that there are four random DIP switches in-between the two knobs. Not documented in the packaging, not even pictured anywhere on any product page, and I have no clue what they do. Above all four it says "1k" and below them it says "4k7". I suppose that's probably referring to different resistors? Flipping the first switch upwards seems to increase the volume, flipping the last one seems to as well, the middle two I have no clue. Doesn't look like it's "1 left 1 right 2 left 2 right" so I've got no clue lol.
Steve
Reviewed in the United States on January 12, 2025
Its pretty straight forward, easy to set up, and flip the switches for a higher volume; however its just quiet even with knobs and all settings maxed out.. and after weeks of use, its begun to get more quiet gradually. It works for great if you don't mind quiet audio.
Steve
Reviewed in the United States on January 12, 2025
Its pretty straight forward, easy to set up, and flip the switches for a higher volume; however its just quiet even with knobs and all settings maxed out.. and after weeks of use, its begun to get more quiet gradually. It works for great if you don't mind quiet audio.
Devin G.
Reviewed in the United States on August 1, 2024
I used it originally to introduce a Bluetooth adapter to my speakers while keeping my Chromecast connected to the speakers as well. I did have a buzz with the ground noise isolator connected but when I removed it, the buzz went away.Now I use it to connect both of my computers and Chromecast to the same speaker system. No hum, buzz or static sound.
Devin G.
Reviewed in the United States on August 1, 2024
I used it originally to introduce a Bluetooth adapter to my speakers while keeping my Chromecast connected to the speakers as well. I did have a buzz with the ground noise isolator connected but when I removed it, the buzz went away.Now I use it to connect both of my computers and Chromecast to the same speaker system. No hum, buzz or static sound.
GKM
Reviewed in the United States on May 27, 2024
Great construction, well built, and worked. connected Audio output of Carpuride Apple play unit ( Also bought on Amazon W103 Pro) to one input, and output of i phone through a Dragonfly cobalt DAC from an i phone 15 to the other , to the Aux in on a 2015 Honda Oddness. Also ran the output through a line filter also purchased through Amazon. Now I can combine signals from Both inputs, adjust Volume levels, and hear Lossless music from i phone, and directions at the same time from car play, avoiding the Loss in Music you get from, Wireless, and gain the HI Res, lossless you get from an external DAC. Can' take picture with Phone in Wireless charger also bought on Amazon, hooked to DAC, Also bought on Amazon, as I am taking pictures with phone
GKM
Reviewed in the United States on May 27, 2024
Great construction, well built, and worked. connected Audio output of Carpuride Apple play unit ( Also bought on Amazon W103 Pro) to one input, and output of i phone through a Dragonfly cobalt DAC from an i phone 15 to the other , to the Aux in on a 2015 Honda Oddness. Also ran the output through a line filter also purchased through Amazon. Now I can combine signals from Both inputs, adjust Volume levels, and hear Lossless music from i phone, and directions at the same time from car play, avoiding the Loss in Music you get from, Wireless, and gain the HI Res, lossless you get from an external DAC. Can' take picture with Phone in Wireless charger also bought on Amazon, hooked to DAC, Also bought on Amazon, as I am taking pictures with phone
Jamie
Reviewed in the United Kingdom on May 22, 2024
Works exactly as described. I used this to combine a drum trigger module with my iPhone and it works perfectly well. However, the attenuation of the signal is very, very high and therefore too quiet to use with earphones or headphones. Rather than spend additional money an a headphone amp, I decided to return this and buy a battery powered mixer which does exactly the same thing, albeit for twice the price; but still significantly cheaper than buying a headphone amp in addition to this.
Jamie
Reviewed in the United Kingdom on May 22, 2024
Works exactly as described. I used this to combine a drum trigger module with my iPhone and it works perfectly well. However, the attenuation of the signal is very, very high and therefore too quiet to use with earphones or headphones. Rather than spend additional money an a headphone amp, I decided to return this and buy a battery powered mixer which does exactly the same thing, albeit for twice the price; but still significantly cheaper than buying a headphone amp in addition to this.
Adam R
Reviewed in Canada on December 21, 2024
The unit arrived and operates as described. Love the simplistic look and controls.My application: two computer audio to one monitor speaker.For customers considering this mixer:This is a passive line level analog bidirectional mixer/splitter. There is no amp. Any low sound levels when the dials are max need to be adjusted at the source or your equipment needing a preamp (ie:microphone). I did experience hum and static that was quickly corrected with a ground loop isolator. This was acknowledged in the product description. There is always a possibility of interference of an analogue signal on any mixer and thus not reflective on my rating. I have not tried the one source input to two outputs but is confident it too would work as described.Great value, even having to buy a $15 dollar ground loop isolator. I would buy again.
Adam R
Reviewed in Canada on December 21, 2024
The unit arrived and operates as described. Love the simplistic look and controls.My application: two computer audio to one monitor speaker.For customers considering this mixer:This is a passive line level analog bidirectional mixer/splitter. There is no amp. Any low sound levels when the dials are max need to be adjusted at the source or your equipment needing a preamp (ie:microphone). I did experience hum and static that was quickly corrected with a ground loop isolator. This was acknowledged in the product description. There is always a possibility of interference of an analogue signal on any mixer and thus not reflective on my rating. I have not tried the one source input to two outputs but is confident it too would work as described.Great value, even having to buy a $15 dollar ground loop isolator. I would buy again.
Bernhard G.
Reviewed in the United States on December 15, 2024
I attached 2 headphone line's and I have to run the volume way up on the keyboard and PC to getjust enough volume in my headphone's to hear the music. Yes, I hear both but the "volume control" on the unit is worthless. Have to look into something amplified. This did not work regardless of the settings.
Bernhard G.
Reviewed in the United States on December 15, 2024
I attached 2 headphone line's and I have to run the volume way up on the keyboard and PC to getjust enough volume in my headphone's to hear the music. Yes, I hear both but the "volume control" on the unit is worthless. Have to look into something amplified. This did not work regardless of the settings.
DavidM
Reviewed in the United States on January 14, 2024
I'm using this device to drive one set of powered speakers from two stereo line level sources: my computer audio output, and a Chromecast Audio device. I did not get the buzzing that apparently shows up in some applications, so I did not have to follow the instructions for getting rid of the possible buzz. Six+ months in, there is no evident damage to either audio source. It is super convenient to be able to use the speakers for two purposes simultaneously. As other reviewers have noted, there is some coupling between the two volume knobs (e.g. if you max one of them out you will silence the other) but practically speaking I have no trouble getting the volume and the relative volume that I want. While listening to Chromecast Audio, I can hear the computer's audio output too, clearly and as loud as I want to set it to.
DavidM
Reviewed in the United States on January 14, 2024
I'm using this device to drive one set of powered speakers from two stereo line level sources: my computer audio output, and a Chromecast Audio device. I did not get the buzzing that apparently shows up in some applications, so I did not have to follow the instructions for getting rid of the possible buzz. Six+ months in, there is no evident damage to either audio source. It is super convenient to be able to use the speakers for two purposes simultaneously. As other reviewers have noted, there is some coupling between the two volume knobs (e.g. if you max one of them out you will silence the other) but practically speaking I have no trouble getting the volume and the relative volume that I want. While listening to Chromecast Audio, I can hear the computer's audio output too, clearly and as loud as I want to set it to.
GBro
Reviewed in the United States on April 16, 2024
This worked perfectly for me connecting the audio output of two laptops into a single pair of powered speakers.The key here is “powered”. This mixer has no internal amplifier, so it will obviously add a bit of loss to the signal (although nothing perceptible to the ear). Your results with unpowered headphones will likely not be as good.Also, one reviewer stated that the volume knobs didn’t work independently, that is not true. Each knob correctly controls the volume of its input channel.
GBro
Reviewed in the United States on April 16, 2024
This worked perfectly for me connecting the audio output of two laptops into a single pair of powered speakers.The key here is “powered”. This mixer has no internal amplifier, so it will obviously add a bit of loss to the signal (although nothing perceptible to the ear). Your results with unpowered headphones will likely not be as good.Also, one reviewer stated that the volume knobs didn’t work independently, that is not true. Each knob correctly controls the volume of its input channel.
zap
Reviewed in Sweden on September 23, 2023
Neat and functional no noncence little mixer.Some issues with the delivery but the dealer was very service minded and solved the problem quickly. Top notch!
zap
Reviewed in Sweden on September 23, 2023
Neat and functional no noncence little mixer.Some issues with the delivery but the dealer was very service minded and solved the problem quickly. Top notch!
Pan Paper
Reviewed in Canada on September 16, 2023
I have 2 monitors that are each connected to a different computer, and 1 soundbar. With this, I’m able to connect both to the same soundbar (output) and even change the volume on each one using the adjustment knobs.I’ve had this for a while now, and I recently got rid of one of the monitors. This is still useful as it’s reversible. I’m able to connect to the sound bar and my headphones at the same time. I can also connect to 2 different headphones from the same source. This was a nice surprise!I did notice that the signal is lower. Even at max volume on my computer, it’s not as loud as I need it to be. I did find that if you turn one knob to the lowest, the other device will become louder.Need to point out that I’m not an audiophile so I can’t comment on the sound quality. It’s good enough for me, but your mileage may vary.
Pan Paper
Reviewed in Canada on September 16, 2023
I have 2 monitors that are each connected to a different computer, and 1 soundbar. With this, I’m able to connect both to the same soundbar (output) and even change the volume on each one using the adjustment knobs.I’ve had this for a while now, and I recently got rid of one of the monitors. This is still useful as it’s reversible. I’m able to connect to the sound bar and my headphones at the same time. I can also connect to 2 different headphones from the same source. This was a nice surprise!I did notice that the signal is lower. Even at max volume on my computer, it’s not as loud as I need it to be. I did find that if you turn one knob to the lowest, the other device will become louder.Need to point out that I’m not an audiophile so I can’t comment on the sound quality. It’s good enough for me, but your mileage may vary.
Cliente
Reviewed in Italy on June 30, 2023
Sto imparando il pianoforte su una tastiera digitale, e ho necessità di usare le cuffie perché mi cimento di notte. Siccome seguo un corso video scaricato da YouTube, ho necessità di suonare contemporaneamente al maestro, per verificare la corretta scelta delle note e soprattutto la correttezza e regolarità del tempo. Avevo quindi necessità di portare in cuffia non solo il suono della tastiera ma anche quello del maestro.Questo mixer mi va benissimo: sia l'uscita audio del tablet col video sia quello della tastiera sono sufficientemente potenti da pilotare, una volta mixati. le mie cuffie monitor professionali Sony MDR-7560.Il mixer è passivo, cioè non ha amplificazione, anzi ha alcune resistenze (e forse condensatori, non l'ho aperto) per cui per mixare segnali di basso livello, come quelli provenienti da due microfoni, potrebbe non andare bene anche se devo apertamente dire che non ho provato.Confermo che il mixer è stereo, una cosa che mi pare non risulti dalla descrizione.Nel mio esemplare la regolazione del volume è perfettamente separata per i due canali, a differenza da quanto riportato da altri utenti: probabilmente il circuito è stato modificato dopo quelle recensioni.Perché metto 4 stelle e non 5? Per il prezzo! Un mixer passivo è di una straordinaria banalità circuitale, di costo veramente infimo. Però la "carrozzeria" è davvero deliziosa, in alluminio satinato, e quindi 15 euro li avrei pagati volentieri. La differenza tra 15 e quanto pagato secondo me vale una stella.
Cliente
Reviewed in Italy on June 30, 2023
Sto imparando il pianoforte su una tastiera digitale, e ho necessità di usare le cuffie perché mi cimento di notte. Siccome seguo un corso video scaricato da YouTube, ho necessità di suonare contemporaneamente al maestro, per verificare la corretta scelta delle note e soprattutto la correttezza e regolarità del tempo. Avevo quindi necessità di portare in cuffia non solo il suono della tastiera ma anche quello del maestro.Questo mixer mi va benissimo: sia l'uscita audio del tablet col video sia quello della tastiera sono sufficientemente potenti da pilotare, una volta mixati. le mie cuffie monitor professionali Sony MDR-7560.Il mixer è passivo, cioè non ha amplificazione, anzi ha alcune resistenze (e forse condensatori, non l'ho aperto) per cui per mixare segnali di basso livello, come quelli provenienti da due microfoni, potrebbe non andare bene anche se devo apertamente dire che non ho provato.Confermo che il mixer è stereo, una cosa che mi pare non risulti dalla descrizione.Nel mio esemplare la regolazione del volume è perfettamente separata per i due canali, a differenza da quanto riportato da altri utenti: probabilmente il circuito è stato modificato dopo quelle recensioni.Perché metto 4 stelle e non 5? Per il prezzo! Un mixer passivo è di una straordinaria banalità circuitale, di costo veramente infimo. Però la "carrozzeria" è davvero deliziosa, in alluminio satinato, e quindi 15 euro li avrei pagati volentieri. La differenza tra 15 e quanto pagato secondo me vale una stella.
MDiN
Reviewed in the United States on November 23, 2022
I needed a solution for mixing (2) PC audio outs into one signal that I could connect my headphones to. I decided to give this device a try despite some bad reviews.It turns out that this device works really well, has a nice metal case, inputs are metal and feel solid and the plastic volume knobs feel robust. There's no line noise, it does indeed mix the channels as advertised and it supports stereo for all inputs/outputs (I did not test reversing the path as the docs say is possible). One thing you need to keep in mind is that all channels need to already be amplified- if you choose an unamplified source the volume will be very low. On Windows 11, I had to choose my "Speaker out" option to get an amplified out from the Display port audio.The only issue is that, once the channels are mixed, only "Level 1" volume knob works and it reduces both inputs together. You can't use both knobs to reduce each input independently. This isn't a major issue for me, but seems like a miss on their part. I also had a stereo cable and a stereo adapter that came through in only one channel for some reason. I did find 2 cables that worked perfectly, so those other cables may have been faulty.Bottom line is that this device is great for my problem where a proper mixer could cost hundreds of dollars, but would be complete overkill. This device, being passive, doesn't introduce any audio buzz or sound quality reduction so going high end for solving such a simple problem is a waste of money.
MDiN
Reviewed in the United States on November 23, 2022
I needed a solution for mixing (2) PC audio outs into one signal that I could connect my headphones to. I decided to give this device a try despite some bad reviews.It turns out that this device works really well, has a nice metal case, inputs are metal and feel solid and the plastic volume knobs feel robust. There's no line noise, it does indeed mix the channels as advertised and it supports stereo for all inputs/outputs (I did not test reversing the path as the docs say is possible). One thing you need to keep in mind is that all channels need to already be amplified- if you choose an unamplified source the volume will be very low. On Windows 11, I had to choose my "Speaker out" option to get an amplified out from the Display port audio.The only issue is that, once the channels are mixed, only "Level 1" volume knob works and it reduces both inputs together. You can't use both knobs to reduce each input independently. This isn't a major issue for me, but seems like a miss on their part. I also had a stereo cable and a stereo adapter that came through in only one channel for some reason. I did find 2 cables that worked perfectly, so those other cables may have been faulty.Bottom line is that this device is great for my problem where a proper mixer could cost hundreds of dollars, but would be complete overkill. This device, being passive, doesn't introduce any audio buzz or sound quality reduction so going high end for solving such a simple problem is a waste of money.
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