Review: Tascam iXJ2 preamp/A>D enables dual-mic/2-channel opportunities for iOS mediography

A discontinued interface from Tascam is still ideal for certain recording and streaming events.

Although the Tascam iXJ2 preamp/A>D is officially discontinued, fortunately it is still available (for now). Ahead you’ll discover why the iXJ2 is a unique enabler for high-quality dual-mic/2-channel, 48 kHz/24-bit iOS recordings, including several use-cases: interviews, sportscasting, and even voiceover auditions; when it’s appropriate, and when it isn’t.

In this article:

  • Immediate precautions about the Tascam iXJ2
  • Not a precaution, but a classification
  • Why Tascam underrates the iXJ2’s hardware specs
  • More about the iXJ2
  • Tested microphones so far
  • Power requirements and connections with tested microphones
  • Four use applications for the iXJ2
  • When the iXJ2 is not appropriate

Immediate precautions about the Tascam iXJ2

I am going to go through the iXJ2’s only precautions here at the very beginning. Then we’ll follow with all of the amazingly good attributes of this unique gem in its category.

  • The iJXJ2 has been officially discontinued by Tascam. However, they are still available at publication time of this article for a fraction of the original price. I hope they last until a similar replacement model appears on the market, from any manufacturer.
  • The iXJ2 has the older 30-pin iOS connector which is present up until and including the iPhone 4s and the 3rd-generation iPad. Starting with the iPhone 5, the 4th-generation iPad, and the iPad Mini, you will need a 30-pin to Lightning cable to connect the iXJ2. I recommend this original Apple cable adapter (not any solid adapter) because with some iOS devices, the solid adapter will block the iOS device’s analog headset port, which you will need to monitor live with the iXJ2.
  • Live monitoring is app-dependent. Some iOS apps allow for live monitoring, and some don’t. Some that do allow it are Bossjock Studio (reviewed here and here), FiLMiC Pro, and RØDE Rec.
  • To monitor live from the iOS device while recording or streaming with the iXJ2, you absolutely must use a headphone (or earbuds) with a 3.5 mm plug that it is TRS (Tip/Ring/Sleeve, stereo 3 conductor). If you mistakenly use one with a TRRS (Tip/Ring/Ring/Sleeve, 4 conductor, i.e. the ones that come with your iOS device) plug, you will not achieve your goal, since the TRRS will confuse your app and it will mistakenly believe that you want to use the TRRS headset as an audio source, which is not what you want. You want the iXJ2 to be the audio source, and the TRS headphone (or earbuds) to be the live monitoring.
  • Regrettably, as of publication time of this article, the Google Hangouts app for iOS does not support any digital audio source. This applies to all of the multiple digital audio devices I have ever tested so far that work with iOS, so it is not the fault of the iXJ2 or any other device: It is currently the fault of the Google Hangouts app for iOS, and I really hope that they fix it soon with an upcoming update. Google Hangouts for iOS is the only audio (or audio-for-video app) that I have ever tried that doesn’t currently support digital audio sources.

Not a precaution, but a classification

  • The iJX2’s two inputs are unbalanced 3.5 mm. Balanced audio is critical when you use long cables, but I only recommend the iXJ2 for situations where the cable is very short.
  • Unlike all of the other preamplifiers/A>D converters I have reviewed in the past (most of which offer switchable 48-volt phantom power), the iXJ2 offers switchable bias voltage (aka plugin power), so I recommend use of the iXJ2 in systems whose microphones are compatible with this type of power (or don’t require any power). (Details about compatible mics and connections are ahead in this article.)
  • For these compact situations where cables are kept very short, the lack of XLR connections is actually an advantage, since the whole package becomes much more compact. I still love balanced XLR for those cases that merit it, but I also know that when it is not required, its absence also makes everything lighter and more compact.

Why Tascam underrates the iXJ2’s hardware specs

I have verified with multiple iOS devices that the iXJ2 is absolutely capable of outputting up to 48 kHz, 24-bit stereo audio (at least), but that’s not how Tascam rated it. I believe the reason that Tascam underrated the iJX2 is because (at least originally) they recommended that it be used with Tascam’s own PCM Recorder app for iOS, which lacks 48 kHz support and I wouldn’t recommend it. To be clear, I recommend the Tascam iXJ2 device, but I don’t recommend the free Tascam PCM Recorder app.

Several friends and I have made 48 kHz, 24-bit recordings using the iXJ2 with the RØDE Rec app. As indicated by Tascam, the iXJ2 actually uses the AK5357 A>D chip from Asahi Kasei Microdevices Corporation (AKM) in Tokyo, Japan.

According to specs on AKM’s website, the AK5357 chip is actually capable of 96 kHz sampling at 24-bit. However, 96 kHz may —or may not— be feasible with the iXJ2. It is not clear, since the RØDE Rec app is currently designed to handle 96 kHz sampling exclusively from two particular microphones from RØDE. It is possible that some other app might unlock the 96 kHz capability in the iXJ2. In any case, for most of us, 48 kHz (at either 24-bit or 16-bit) is exactly what we need, and recording uncompressed 96 kHz audio would create files that would be double in size. The Tascam iXJ2 is also capable of being used with 44.1 kHz for non-video applications. At 48 kHz, Tascam rates the iXJ2 as having an impressive 100 dB signal-to-noise and dynamic range. Already, several people have written me since they were so impressed with the audio recording I made in my recent review: Plantronics accidentally enters broadcast headset market. They were impressed with the sound and wanted more details about the preamp/A>D converter used, which was indeed the iXJ2.

More about the iXJ2

The iXJ2 is a palm-sized, featherweight preamp/A>D converter for iOS. As stated previously, it has the earlier 30-pin connector for direct coupling to earlier iOS devices. However, it is completely compatible with iOS 7 on later devices too, via a cable that goes from 30-pin to Lightning. Reliability with the clone Lightning adapters have been inconsistent, so I recommend the original Apple ones unless you have lots of time to test and return the ones that don’t work.

The iXJ2 has two 3.5 mm inputs for unbalanced microphone or line level sources. In the applications I have in mind, the fact that the inputs are unbalanced is not a problem, since cables are kept quite short.

On page 2 of this article

  • Tested microphones so far
  • Power requirements and connections with tested microphones
  • Four use applications for the iXJ2
  • When the iXJ2 is not appropriate

Click here for page 2 of this article…

Tested microphones so far

So far, I know that the iXJ2 works perfectly with the mic plug from the Audio Technica ATR–3350 lavalier, the MXL MM160 lavalier microphone, Plantronics .Audio 326 headset with microphone (reviewed here), the original RØDE SmartLav, and the improved RØDE SmarLav+.

However, the power requirements and cable connections vary in each case, as explained in detail in the next section. Each input of the iXJ2 can accept either 3.5mm TS (Tip/Sleeve) or TRS (Tip/Ring/Sleeve). A three-position switch allows you to determine whether you want to use one input, the other input, or both inputs. Another switch determines whether the iXJ2 should send plugin power to the mics (details ahead).

The iXJ2 has a built-in, two-channel hardware audio limiter which is always active. However, there is a switch to determine whether the two channels of the limiter should be linked or not. Linking them is only appropriate for a true-stereo situation (not a dual mono one), so I didn’t link them. (I do have a pending review of a stereo microphone, but it’s a digital mic, so it wouldn’t work with the iXJ2 anyway.)

The iXJ2 has two semi-stuck knobs for you to adjust the level. In other words, you can adjust each channel separately. However, to do so, you must physically hold one of the knobs to prevent it from moving together with the other. I much prefer the potentiometer knob on the two products I just reviewed from IK Multimedia, the single-channel iRig Pro preamp/A>D converter, and the iRig Mic HD. I don’t currently know whether IK Multimedia is planning to create any dual-channel standalone preamp/A>D converter, and if so, whether it will have phantom or bias power (aka, plugin power).

Power requirements and connections with tested microphones

For relatively short productions, the iXJ2 gets power directly from your iOS device, whether or not you need to power your microphone(s) from the iXJ2. However, for extended productions or recordings, the iXJ2 has a mini USB power input which actually allows you to charge the iOS device while the iXJ2 is connected to your iOS device, occupying the Lightning or 30-pin connector. If you are using an iPad, be sure to purchase a mini USB charger with sufficient amperage. Note that I wrote mini USB, not the more common micro USB.

Here is the situation with different tested microphones:

Four use applications for the iXJ2

CASE A: dual-mic, dual channel, single system (audio + video recorded with FiLMiC Pro on iOS device)

Originally, I decided to experiment with the iXJ2 since I know many people who need to operate the camera, interview, monitor, and record two different microphones which are recorded as dual mono, in order to have better control during editing. So for that applications, I tested the Plantronics .Audio 326 headset with built-in mic (review here) for the camera operator/interviewer, plus one of the mentioned lavalier mics mentioned in the prior section on the interviewee. In this first case, an iPad, iPhone, or iPod Touch records the audio and video together (single-system) using FiLMiC Pro at 48 kHz. David Basulto (creator of the iOgrapher) contacted me since he had a case like this, and we’ll see David again in case C.

CASE B: dual-mic, dual channel, dual-system (audio + video recorded on separate devices)

As shown above, Carla Sánchez of OrganicLifestyle.TV is doing dual-system audio, where the video is shot with her Canon 70D camera, and the 48 kHz audio is recorded on her iPhone 5 via the Tascam iXJ2 and RØDE Rec. For Carla, it is very important to have each mic recorded as dual mono for complete control in post, in order to shut off the mics that were not being used at any given moment, and to be able to adjust levels independently when they were active. Although Carla is not currently using a Plantronics .Audio 326 headset, she is currently using some of the mentioned lavalier microphones from the prior section, and she later syncs and edits with Final Cut Pro X.

CASE C: Two live sportscasters

Next, David Basulto needed two sportscasters for live streaming. He ended up using two Plantronics .Audio 326 headsets with one iXJ2. David has already used this with success using several streaming apps.

CASE D: Remote voiceover auditions

Both Víctor Martorella and Memo Sauceda (Miami-based Castilian-language voice over talent I have covered in prior articles), were both so impressed with the quality of the Plantronics .Audio 326 headset recording they heard in my recent review that each of them immediately ordered one, plus the Tascam iXJ2 and Lightning adapter to use for remote audio auditions. Both said that they liked to have the freedom of not holding a microphone in their hand when doing remote voiceover auditions from a car or van. I am the first to recognize that Víctor and Memo could likely simplify their portable setup with a USB headset and USB>Lightning cable, but so far we haven’t yet found any that sounds so good and also supports 48 kHz, and I get the impression that they are both likely to get extra use by occasionally using case A for themselves two.

When the iXJ2 is not appropriate

The iXJ2 is not appropriate when you really do need the advantages of a truly balanced connection (especially with a balanced microphone at a longer distance), or when you plan to use a microphone that demands phantom power, not bias voltage (aka plugin power). (By the way: phantom power only works with balanced microphones.)

The iXJ2 is also not appropriate when you need more than two microphones, each on its own track, or when you need an automatic mixer to attenuate the inactive microphones on the fly, as in the case of this review.

Thanks to María Kowalski

Thanks to María Kowalski of for lending me her iXJ2 for this review.

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Born in Connecticut, United States, Allan Tépper is a bilingual consultant, multi-title author, tech journalist, translator, and language activist who has been working with professional video since the eighties. Since 1994, Tépper has been consulting…

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