{"title":"Line Amps","description":null,"products":[{"product_id":"radial-j-4-stereo-line-driver-interface","title":"Radial J+4 Stereo Line Driver Interface","description":"\u003cp\u003eThe Radial J+4 is a stereo interface designed to accept unbalanced low output level devices such as instruments, computers or CD players and boost the signal to a balanced +4dB level for easy manipulation in professional environments such as broadcast, recording studios and live touring.\u003c\/p\u003e \u003cp\u003eThe design begins with 100% discrete components for optimal signal transfer. Careful attention has been paid to eliminate noise by combining the advantages of active signal buffering with transformer isolation. The J+4 delivers better than 95dB signal to noise while ensuring hum and buzz caused by ground loops along with spurious noise from clocking does not pollute the signal path. For ease of use, controls have been kept to a minimum. This includes a stereo level control, a high pass (low cut) filter and ground lift. The choice of input connectors include a stacked set of ¼\" jacks for DJ mixers or keyboards, RCAs for CD players and a mini 3.5mm for iPods.\u003c\/p\u003e \u003cp\u003eAs with all Radial products, the Radial J+4 is built tough to handle the extreme rigors of professional touring. A unique 14-gauge steel I-beam inner frame ensures the sensitive PC board will not be subjected to outside stress which could potentially cause solder joints to fail. An innovative book-end outer shell creates protective zones around the controls, switches and connectors to further improve dependability while a full bottom no-slip pad provides both mechanical and electrical isolation.\u003c\/p\u003e ","brand":"Radial Engineering Ltd.","offers":[{"title":"Default Title","offer_id":51443068666040,"sku":"47756","price":339.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/7382\/4696\/files\/47756_Radial-J-4-Stereo-Line-Driver-Interface.jpg?v=1768003863"},{"product_id":"rdl-sta-1m-audio-line-amplifier","title":"RDL STA-1M Audio Line Amplifier","description":"\u003cp\u003eThe STA-1M allows bridging any audio line, adjusting the gain, and driving a balanced or unbalanced line. The circuit design allows the input to accept either balanced or unbalanced signals, of either high or low impedance. This is an instrumentation type input stage which will amplify the differential input, regardless of ground reference. The output is capable of driving either high or low impedance loads, and the output may be connected either balanced or unbalanced. RDL's SupplyFlex power input configuration is included in the STA-1M. The power supply input may be fed from a floating (not ground-referenced) 24 Vdc power source, from a bipolar power supply (+\/ 12 Vdc or +\/-15 Vdc) or from a ground-referenced 24 Vdc power supply.\u003c\/p\u003e ","brand":"Radio Design Labs","offers":[{"title":"Default Title","offer_id":51444367425720,"sku":"77456","price":159.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/7382\/4696\/files\/77456_RDL-STA-1M-Audio-Line-Amplifier.jpg?v=1768250160"},{"product_id":"radial-j-iso-stereo-4db-to-10db-isolator-converter","title":"Radial J-Iso Stereo +4dB to -10dB Isolator\/Converter","description":"\u003cp\u003eThe Radial J-Iso™ is a stereo line isolator designed to convert a professional +4dB line level balanced signal to an unbalanced -10dB consumer level device. This enables you to take the balanced output of a mixer and feed a consumer level recorder or audio input on a computer.\u003c\/p\u003e \u003cp\u003eThe passive design begins with 100% discrete components throughout. A \"set and forget\" level control lets you attenuate the input signal to prevent it from overloading the destination device. Output connections include a stereo pair of 1\/4\" connectors, a set of RCAs and a mini 3.5mm (1\/8\") for interfacing to a mini recorder or lap-top computer. Transformer isolation helps eliminate hum and buzz caused by ground loops while eliminating stray DC currents from flowing. Construction begins with 14 gauge steel throughout utilizing Radial's unique bookend construction. This creates a protective zone around the connectors and controls for added durability. The steel construction also assists by shielding the transformers from outside magnetic fields. Inside, the J-Iso features an innovative I-beam skeletal insert that makes it virtually impossible to torque the PC board. This reduces potential stress which could cause premature solder joint failure.\u003c\/p\u003e ","brand":"Radial Engineering Ltd.","offers":[{"title":"Default Title","offer_id":51444710899896,"sku":"88258","price":389.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/7382\/4696\/files\/88258_Radial-J-Iso-Stereo--4dB-to--10dB-Isolator-Converter.jpg?v=1768254095"},{"product_id":"radial-r800-1530-highline","title":"Radial R800 1530 Highline Passive Line Isolator","description":"\u003cp\u003eThe Highline is a passive line isolator designed to connect guitar and amp modelers to a mixer for live touring and recording applications, featuring a premium Jensen transformer for exceptional audio performance. It is a line isolator that is specifically designed to address the needs of instrumentalists who use amp modelers, allowing them to seamlessly connect to a PA or a recording system while maintaining their full signal integrity with no added noise or distortion. The Highline features a premium Jensen 1:1 transformer, which retains the full volume level from the pedalboard to the PA, while also providing galvanic isolation that eliminates ground loop noise for a clean and noise-free signal. The balanced output of the Highline allows for long cable runs to the PA, and it also blocks phantom power so it never reaches the pedalboard. The Highline can also accept stereo inputs and sum them down to mono with the use of the Sum switch. Guitarists and bassists who use utilize amp modelers on their pedalboard have a unique set of problems: While amp sims can produce line-level outputs, they often still use 1\/4\" unbalanced connectors that won't support long cable runs without degrading the tone of the instrument, and they are particularly susceptible to noise from ground loops when connected directly to the PA. The Highline addresses these issues by inserting a 1:1 transformer into the signal path, which provides isolation to reduce noise, protects against phantom power, and keeps the signal at line level for direct connection to the PA system.\u003c\/p\u003e","brand":"Radial Engineering Ltd.","offers":[{"title":"Default Title","offer_id":51838120984760,"sku":"200933","price":179.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/7382\/4696\/files\/200933_Radial-R800-1530-Highline-Passive-Line-Isolator.jpg?v=1768919451"},{"product_id":"r800-1539-highline-stereo","title":"R800 1539 Highline Stereo Passive Line Isolator","description":"\u003cp\u003eThe Highline is a passive line isolator designed to connect guitar and amp modelers to a mixer for live touring and recording applications, featuring a premium Jensen transformer for exceptional audio performance. The Highline Stereo is a full-featured line isolator that is specifically designed to address the needs of instrumentalists who use amp modelers, allowing them to seamlessly connect to a PA or a recording system while maintaining their full signal integrity with no added noise or distortion. The Highline features premium Jensen 1:1 transformers, which retain the full volume level from the pedalboard to the PA, while also providing galvanic isolation that eliminates ground loop noise for a clean and noise-free signal. The balanced outputs of the Highline Stereo allow for long cable runs to the PA, and the device also blocks phantom power so it never reaches the pedalboard. The Highline Stereo can be easily reconfigured for multiple setups with the use of two summing switches: these allow you to connect to the PA or your stage monitors in either stereo or mono.  Guitarists and bassists who use utilize amp modelers on their pedalboard have a unique set of problems: While amp sims can produce line-level outputs, they often still use 1\/4\" unbalanced connectors that won't support long cable runs without degrading the tone of the instrument, and they are particularly susceptible to noise from ground loops when connected directly to the PA. The Highline Stereo addresses these issues by inserting 1:1 Jensen transformers into the signal path, which provide isolation to reduce noise, protect against phantom power, and ensure that the audio signals remain at line level for direct connection to the PA system.\u003c\/p\u003e.","brand":"Radial Engineering Ltd.","offers":[{"title":"Default Title","offer_id":51838121017528,"sku":"200934","price":249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/7382\/4696\/files\/200934_R800-1539-Highline-Stereo-Passive-Line-Isolator.jpg?v=1768919461"},{"product_id":"shure-a85f","title":"Shure A85F Transformer Low Z Female Xlr To High Z 1;4 In","description":"\u003cp\u003eA85F is a low to high-impedance microphone-matching transformer that provides 24dB of signal increase gain. It has balanced female XLR and unbalanced high impedance male 1\/4-inch phone plug connectors, and may be used in reverse. The A85F is typically used to connect a balanced low-impedance microphone output to an unbalanced high impedance input on a mixer or recorder.\u003c\/p\u003e","brand":"Shure Incorporated","offers":[{"title":"Default Title","offer_id":52444561735864,"sku":"23184","price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/7382\/4696\/files\/a85f.jpg?v=1784668930"},{"product_id":"radial-r800-1150-00","title":"Radial R800 1150 00 Pro-Iso Balanced to Unbalanced Passive Converter","description":"\u003cp\u003eThe Radial Pro-Iso is built for audio engineers, broadcast technicians, and AV integrators who need a reliable, power-free solution for interfacing professional balanced line-level sources with consumer or prosumer unbalanced destinations. Its transformer-isolated passive design is specifically tuned for voice-range energy, making it an efficient tool for house-of-worship sermon capture, ENG news gathering, and spoken-word recording workflows where dedicated voice intelligibility matters more than extended full-bandwidth reproduction.\u003c\/p\u003e\u003cp\u003eA 100% discrete component signal path keeps the audio chain clean while a set-and-forget level control allows engineers to dial in attenuation once and leave it, preventing downstream devices from being overloaded. The three unbalanced output formats — quarter-inch, RCA, and 3.5mm TRS — give integrators flexibility to connect directly to laptops, portable recorders, or consumer video gear without additional adapters. Transformer isolation simultaneously removes hum and buzz from ground loops and blocks stray DC currents that can damage downstream equipment.\u003c\/p\u003e\u003cp\u003eWhere passive DI boxes typically target instrument-level signals, the Pro-Iso operates at line level in a stereo dual-mono configuration, making it appropriate for console insert sends, broadcast mix outputs, and recording interface feeds. The 14-gauge steel chassis provides rugged durability in both permanent installs and portable field kits, and the transferable three-year warranty reflects Radial's confidence in long-term reliability.\u003c\/p\u003e","brand":"Radial Engineering Ltd.","offers":[{"title":"Default Title","offer_id":53777736106168,"sku":"207587","price":239.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/7382\/4696\/files\/207587_R800-1150-00_ALT02sqr.jpg?v=1784233778"}],"url":"https:\/\/soundpro.com\/collections\/line-amps.oembed","provider":"SoundPro","version":"1.0","type":"link"}