Sonifex Rb-Ma1 Single-Channel Mic Preamp

Sonifex Rb-ma1 Single-channel Mic Preamp

Product Code: eq157880
Availability: In Stock

$1,398.00 $2,083.02

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Description
Reviews (13)

Elevate your mic signals with the RB-MA1 from Sonifex, a single-channel low-noise mic preamp that converts line-level to mic-level signals, ideal for stages or long cable runs. With a rugged metal chassis and recessed controls, the RB-MA1 is designed to withstand the rigors of backline use, studio work, and touring.

The RB-MA1 sports one electronically balanced XLR 3-pin female input and one balanced XLR output. The XLR output can be rewired to be unbalanced by grounding the nonphase pin, allowing for both balanced and unbalanced output. A recessed potentiometer allows for adjusting input gain from 36 to 75 dB, and DIP switches are provided for activating +48V phantom power and the 125 Hz high-pass filter. The AC input voltage can be selected for global compatibility, between 115 and 230 VAC.

Ideal for Live Stages and Studios Converts Mic Level to Line Level Great for Long Cable Runs to Mixing Gear Electronically Balanced XLR I/O Output Can Be Rewired for Unbalanced Recessed Input Gain Control Switchable 125 Hz High-Pass Filter +48V Phantom Power Selectable 115 to 230 VAC Voltage

General
Frequency Response	20 Hz to 20 kHz (±0.1 dB, 600-Ohm Load, at 1 kHz)
Maximum Input Level	-10 dBu
Maximum Output Level	+28 dBu
Input Impedance	2 Kilohms
Output Impedance	<50 Ohms
EIN	130 dB
THD	0.01% (at 1 kHz)
Inputs / Outputs
Audio I/O	1x XLR 3-Pin Mic Input (Balanced) 1x XLR 3-Pin Line Output (Balanced or Unbalanced)
Power
Power Source	AC Input
AC Input Power	110 to 240 VAC, 50 / 60 Hz
Power Consumption	6 W (Maximum)
Physical
Mounting	Bottom: 2x Standard Rackmount Hole
Color	Red
Material of Construction	Metal
Environmental Resistance	No
Dimensions	11 x 4.3 x 1.7" / 28 x 10.8 x 4.2 cm
Weight	2 lb / 0.9 kg

The XLR 3-pin output connector is electronically balanced and can be wired unbalanced by grounding the nonphase signal, allowing you to feed balanced and unbalanced equipment. It has the following connections:

Pin 1: screen
Pin 2: phase
Pin 3: nonphase

Related Questions and Answers

Q: 1. Can I record video simultaneously while using this interface with my microphone to record an interview?

A: Yes, the Shure MOTIV MVI can be used as the primary audio device during recording.

Q: 2. What is the brand and model microphone and headphone included in the bundle?

A: The Kit include a Shure PGA58 Dynamic Mic with 15' XLR to XLR cable and Shure SRH240A Professional Headphones. It appears as though the configuration buttons on our website are reversed, but this is the link to the Kit: https://www.bhphotovideo.com/c/product/1560690-REG/shure_motiv_mvi_digital_recording.html

Q: 3. How do you use this with a 9 volt battery? I do not see any place to insert the battery

A: The battery compartment is located on the bottom panel of the M48 and is accessible by sliding and removing the battery case cover.

Q: 4. What rating is the included AC adapter? Looking for an answer like "9V, 1.0A, positive polarity". Cannot read the pictures!

A: The Mackie M48 Single-Channel 48V Phantom Power Supply uses a +9V DC power adapter which is included with purchase. There is no information provided for the amperage rating, but the manufacturer does specify in the user manual to "Only use the factory-authorized power supply that came with the M48."

Q: 5. Can the PS - 1A work with an Li-polymer 9V like Ipowerus instead of an Alkaline 9V ?

A: Thank you for your question. This unit will only work properly with a Alkaline or NiMH battery,.

Q: 6. Hi, works with M1 iPad pro?

A: Right now there is now confrmation this will work wth the M1 or OS11 (Big Sur)

Q: 7. Specs?

A: RB-A300 specs are as followed SECTIONS 3 MAXIMUM LOAD 10kg WEIGHT 1.4kg FOLDED HEIGHT 61cm EXTENDED HEIGHT 151cm ROUND BASE DIAMETER 30cm MATERIAL Aluminium Alloy

Q: 8. If I input a 3.5mm mic will that get phantom power, and if so, how much, or is it just through the XLR connections?

A: Phantom power is provided through an XLR connection only. Mics that require power with a 3.5mm jack usually require plug in power which is approximately 2 - 5 volts. The MX310 is not able to provide this power.

Q: 9. Does this mic have a 128 bit encryption?

A: Yes. The Revolabs xTagg uses 128-bit DSAA (DECT Standard Authentication Algorithm) authentication, 64 bit DECT Standard Cipher.

Q: 10. The bottom connection is 3/8"-16? Will this work with the Benro 3-Leg Locking Base For Monopods

A: Yes, you can attach your Benro 3-Leg Locking Base For Monopods to the monopod included with iFootage RB-A300 Cobra 2 59.4" Round-Base Monopod.

Clive	04/09/2024
[130 dB] Solid build, absolute reliability & nice sounding pre-amp with plenty of quiet gain - as with all my SD gear! One of my favorite uses is to power a Sennheisser 416T mic. Can’t find T-power in affordable mixers nowadays so has kept this mic. alive. Also perfect tool for boom op. wanting easily adjustable monitoring. 5

Jeremy	03/09/2024
[AC Input] TO be clear, I was sent one of these for my honest and unbiased review..........that being said...there is no reason to pay more. This is constantly on sale at 35, 40 bucks and it is clean and does exactly what it is supposed to do. If only people would get off the cloudlifter bandwagon. The cloudlifter is CRIMINALLY overpriced when you have options like this on the market. And its not JUST this that is cheaper and possible AS good...there are more...but this is my pick considering it is seemingly always available (unlike others) and it is never overpriced. Well done! 5

james	28/08/2024
[Metal] The $30 preamps have noise and the good ones are $100 and up. This is perfectly placed. It's worth the $50, for sure. I thought 30dB gain was too much, but both the PC interface and the DAW software benefitted from tweaking their gain down. MY SE V7 is an amazing voiceover mic now, and would be a fantastic podcaster mic. 5

Michael	28/07/2024
[AC Input] I had to crank the mic gain all the way up, now I don't! $30 well spent. 5

Jim	02/07/2024
[+28 dBu] Works as advertised, very pleased. I tried it with my Electro-Voice 635A handheld mic, which does not have power or audio adjustment settings, so it's levels are often too low. This Polsen inline XLR preamp boosted my volume from the mic and did not cause any noise or distortion from what I can tell. If you look at the pictures I uploaded, you can see the difference in volume with and without this preamp. As you can see it was pretty significant. This will be handy when I need to boost the volume without raising the gain internally in the camera. [I have received this product in exchange for my honest review] 5

Joel	13/06/2024
[Red] So far so good 5

Jonathan	09/06/2024
[Red] Works great. I keep it in my bag with me. 5

Art Video	07/06/2024
[Red] I'm just...WOW!!! The gain this device provides is more than you'll ever need on a dynamic mic. I'm using a Sennheizer MD-42 dynamic as the testing mic, I don't use it often because it needs a lot of gain. It works well on high end recorders, but for using it on a camera, the mic is just ok...It never satisfied me until I tried the XP-30D. This preamp allows much less gain on the recorder or your camera. And it's a LOT of GAIN!! Maybe too much in some cases, for example, on a Tascam DR-100 MKII recorder. I used a Tascam DR-100 Mark III recorder for this experiment. Now, I have to set the gain so Low, resulting in a super clean and hiss free audio, like most decent Condenser mics do. After plugging in the XP-30D, adjusting the gain to minimum wasn't enough. Additionally, on the DR100 MKIII recorder, I had to turn on the PAD filter on my recorder, then adjust the gain, WAY low! Further next, I also tested it on a Canon C100Mark II. These cameras have terrible preamps, and adding the MD-42 mic makes things even worse. I plugged the XP-30D in, turned on phantom power on the C100 MKII, and the gain was awesome! Please make sure you see the pictures I included in this review. It shows everything you want to see. If you're looking for a powerful preamp, look no further. It's insanely powerful. The only thing I didn't like is, when plugging the mic, the XLR "input" PLUG from the XP-30D makes the mic connection a little lose... I tried is also with another 3 mics. Same. However, the slightly loose connection I will NOT make noises or anything that would ruin your presentation or recording even if you touch the plug. It's just a little loose and I thought it is worth mentioning... Before I plugged it in for the first time I used it, I expected a snug fit like all XLRs do. Other than that, this thing REALLY does the job!! [I have received this product in exchange for my honest review] 5

Jeremy	28/05/2024
[Red] I was honestly expecting a somewhat noisy preamp for $50....but...this was not the case. Not only did the polsen not color the audio, it was also very quiet while providing a great amount of clean gain. Devices like this are the reason the cloud lifter is overpriced. Great device....great price [I have received this product in exchange for my honest review] 5

anyonymous	07/05/2024
[130 dB] Got this for my boom Op. Easy setup and great sturdy design. The XLR line out connection is hard to disconnect. It's just at an awkward angle, but it has a firm connection. 5