--- product_id: 3502894 title: "Rolls MB15b Promatch 2-Way Stereo Converter" brand: "rolls" price: "NT$6677" currency: TWD in_stock: true reviews_count: 13 category: "Rolls" url: https://www.desertcart.tw/products/3502894-rolls-mb15b-promatch-2-way-stereo-converter store_origin: TW region: Taiwan --- # Stereo RCA to balanced XLR conversion Ultra-low noise floor (-88 dB) Independent stereo level controls Rolls MB15b Promatch 2-Way Stereo Converter **Brand:** rolls **Price:** NT$6677 **Availability:** βœ… In Stock ## Summary > 🎧 Unlock Pro-Level Audio Power & Control β€” Don’t Let Your Amp Underperform! ## Quick Answers - **What is this?** Rolls MB15b Promatch 2-Way Stereo Converter by rolls - **How much does it cost?** NT$6677 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/3502894-rolls-mb15b-promatch-2-way-stereo-converter) ## Best For - rolls enthusiasts ## Why This Product - Trusted rolls brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Compact & Durable Design:** Stainless steel chassis fits discreetly into any professional or home studio environment, built to last. - β€’ **Noise-Free Sound Integrity:** Experience pristine audio with an ultra-low noise floor of -88 dB and minimal distortion (0.003%). - β€’ **Precision Stereo Level Control:** Fine-tune each channel independently for perfect audio balance and clarity in any setup. - β€’ **Seamless Pro-Consumer Audio Bridge:** Effortlessly converts stereo RCA signals to professional balanced XLR outputs, unlocking true amplifier power. - β€’ **Versatile Headphone to Line Level Adapter:** Includes 1/8” headphone input conversion for flexible connectivity across devices. ## Overview The Rolls MB15b Promatch 2-Way Stereo Converter is a compact, stainless steel device that converts consumer stereo RCA signals to balanced professional XLR line levels and vice versa. Featuring independent stereo level controls, ultra-low noise floor (-88 dB), and minimal distortion (0.003%), it ensures pristine sound quality while bridging home audio gear with pro amplifiers. Ideal for audiophiles and professionals seeking to maximize amplifier output and maintain flawless audio integrity. ## Description The MB15 Pro match converts consumer level stereo RCA signals to balanced XLR professional line level, and back. One side of the unit, labeled 1, has two XLR inputs and stereo RCA outputs. The other side labeled 2, has stereo RCA inputs and two XLR outputs. Each side has stereo level controls, and an LED indicates that power is applied to the unit. An additional benefit of the MB15 is that it will act as a Balanced XLR line level control. By adding a stereo pair jumper between the four RCA jacks (connecting ins to outs), The two level controls may be inserted into any balanced XLR line.Specifications: Max out: balanced: +18 dB, unbalanced: +12 db*max in: balanced: +22 dB, unbalanced: +22 db*input impedance: RCA: 100K ohm, XLR: 10 K Ohm, 1/8 stereo: 10K output Impedance: RCA: 100 Ohm, XLR: 100 Ohm balanced*noise floor: -88 db*gain: +4 dB In: -8 dB, -10 dB In: + 20 db*thd: .003%*Power: 12 VDC adapter (center negative)*size: 4.15 x 2.46 x 1.55 Weight: 1 lbs. (.45 kg). Review: Allows use of Crown XLS with Surround receiver - This is being used in our computer audio 2.1 setup. (1) pair of wall mounted NHT Superzeros, (1) Denon AVR 1907 connected with optical to our computers output, (1) Rolls Promatch MB15B (been using it for a year or two already), (1) Crown XLS2000, (1) Infinity 1262W in a 4.6cu ft vented box we built tuned with an F3 approx 21hz. The Rolls Promatch doesnt appear to add any distortion or hiss or feedback and most importantly it solved our issue of low output. Sound quality of the Rolls Promatch? To my ears it does not alter the sound in anyway. No distortion, no hiss, no feedback. It is a well designed piece of gear. Using a Crown XLS2000 to power a single 12" Infinity Subwoofer in a 4.6cu ft vented box we made. Before the Rolls Promatch, I had to turn the Crown gain up all the way to get substandard output from the subwoofer. After reading recommendations that said to get one of these... I ordered one. Let me tell you something, this Rolls Promatch brought our subwoofer to life!!!! Connected an RCA from the Subwoofer preout on the Denon AVR 1907 to the input on the Rolls Promatch. Connected an XLR cable from the Rolls to the Crown XLS input. BOOOM!! Now we keep the Crown gain at about 2 oclock. Sometimes we have to turn the Rolls Promatch down because the subwoofers output overwhelms the audio coming from the pair of NHT Superzeros. If you are mixing consumer audio receivers with pro audio amplifiers you should invest in one of these. Even the newer pro amps that claim to have a switch, to switch between pro audio or consumer input voltage, dont work as well from the reviews I read. You have a regular home audio/video receiver and you are using a pro audio amplifier? Get one of these if you want to use that power you paid for, otherwise the amp is barely putting out any watts because the input signal to the amp is too low. Side note, if you are like me and you have a 2000 watt amplifier connected to a $60 subwoofer that only handles 300ish watts, dont turn it up too loud playing extended bass notes because the voice coil will start to smoke. I was a car audio bass competitor 20 years ago. I have just a little experience with overheating voice coils (playing extended bass notes at the transfer function of the vehicle +10hz after loaded with pressure, for the SPL meter light tree :) I did hit 154.4 db though with 1400ish watts RMS with (2) Crossfire entry level 15"s in a 10cu ft vented box (play more than a few seconds and they would blow). Review: Perfect audio match converter. - Perfect match box for audio connections. The price is right for an active audio converter. ## Features - Stereo RCA to Stereo XLR - Stereo level control for each channel - Works as stereo balanced line level control - 1/8” headphone level to line level adaptor ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0002IL4B4 | | Best Sellers Rank | #23,444 in Musical Instruments ( See Top 100 in Musical Instruments ) #23 in Recording Signal Converters | | Brand | rolls | | Brand Name | rolls | | Customer Reviews | 4.5 out of 5 stars 164 Reviews | | Global Trade Identification Number | 00675889001501 | | Included Components | Promatch 2way +4/-10 Converter | | Interface | RCA | | Interface Type | RCA | | Item Dimensions L x W | 4.15"L x 2.5"W | | Item Type Name | ROLLS Promatch and More | | Item Weight | 1.1 Pounds | | Manufacturer | Rolls | | Material | Stainless Steel | | Material Type | Stainless Steel | | Model | MB15B | | Number of Channels | 2 | | Number of Pins | 20 | | Part Number | MB15B | | Product Dimensions | 4.15"L x 2.5"W | | UPC | 675889001501 | | Unit Count | 1.0 Count | | Warranty Description | 2-Year Warranty | ## Product Details - **Brand:** rolls - **Number of Pins:** 20 - **Interface Type:** RCA - **Number of Channels:** 2 - **Product Dimensions:** 4.15"L x 2.5"W ## Images ![Rolls MB15b Promatch 2-Way Stereo Converter - Image 1](https://m.media-amazon.com/images/I/81uJb3EeniL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Allows use of Crown XLS with Surround receiver *by A***8 on October 17, 2019* This is being used in our computer audio 2.1 setup. (1) pair of wall mounted NHT Superzeros, (1) Denon AVR 1907 connected with optical to our computers output, (1) Rolls Promatch MB15B (been using it for a year or two already), (1) Crown XLS2000, (1) Infinity 1262W in a 4.6cu ft vented box we built tuned with an F3 approx 21hz. The Rolls Promatch doesnt appear to add any distortion or hiss or feedback and most importantly it solved our issue of low output. Sound quality of the Rolls Promatch? To my ears it does not alter the sound in anyway. No distortion, no hiss, no feedback. It is a well designed piece of gear. Using a Crown XLS2000 to power a single 12" Infinity Subwoofer in a 4.6cu ft vented box we made. Before the Rolls Promatch, I had to turn the Crown gain up all the way to get substandard output from the subwoofer. After reading recommendations that said to get one of these... I ordered one. Let me tell you something, this Rolls Promatch brought our subwoofer to life!!!! Connected an RCA from the Subwoofer preout on the Denon AVR 1907 to the input on the Rolls Promatch. Connected an XLR cable from the Rolls to the Crown XLS input. BOOOM!! Now we keep the Crown gain at about 2 oclock. Sometimes we have to turn the Rolls Promatch down because the subwoofers output overwhelms the audio coming from the pair of NHT Superzeros. If you are mixing consumer audio receivers with pro audio amplifiers you should invest in one of these. Even the newer pro amps that claim to have a switch, to switch between pro audio or consumer input voltage, dont work as well from the reviews I read. You have a regular home audio/video receiver and you are using a pro audio amplifier? Get one of these if you want to use that power you paid for, otherwise the amp is barely putting out any watts because the input signal to the amp is too low. Side note, if you are like me and you have a 2000 watt amplifier connected to a $60 subwoofer that only handles 300ish watts, dont turn it up too loud playing extended bass notes because the voice coil will start to smoke. I was a car audio bass competitor 20 years ago. I have just a little experience with overheating voice coils (playing extended bass notes at the transfer function of the vehicle +10hz after loaded with pressure, for the SPL meter light tree :) I did hit 154.4 db though with 1400ish watts RMS with (2) Crossfire entry level 15"s in a 10cu ft vented box (play more than a few seconds and they would blow). ### ⭐⭐⭐⭐⭐ Perfect audio match converter. *by D***P on March 4, 2026* Perfect match box for audio connections. The price is right for an active audio converter. ### ⭐⭐⭐ This box has an excellent 3. 5mm stereo audio to Dual Balanced XLR ... *by L***J on April 12, 2017* This box has an excellent 3.5mm stereo audio to Dual Balanced XLR output, but when you use the RCA inputs, it has bad grounding and the hum from the XLR to RCA side affects the RCA to XLR side. Presently I'm only using it to send 3.5mm to a pair of XLR outputs. I'm using a Scarlet 2i2 for the computer's balanced stereo in and out. So it doesn't handle a computer using stereo 3.5mm to RCA converter cables well. If Rolls replies, I'll add a star back on. ## Frequently Bought Together - Rolls MB15b Promatch 2-Way Stereo Converter - Monoprice 1.5ft Premium 2 RCA Plug/2 RCA Plug M/M 22AWG Cable - Black - DteeDck RCA Splitter 1 Female to 2 Male, 2 Pack - RCA Audio Video Cable Splitter Adapter, Dark Blue --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tw/products/3502894-rolls-mb15b-promatch-2-way-stereo-converter](https://www.desertcart.tw/products/3502894-rolls-mb15b-promatch-2-way-stereo-converter) --- *Product available on Desertcart Taiwan* *Store origin: TW* *Last updated: 2026-07-09*