Balanced or unbalanced? That’s not a problem with the BALUN/PLI05. BALUN stands for balanced-unbalanced. This means that because the PLI05 uses TRS (stereo) jack sockets, both the input and output can be operated balanced or unbalanced. The PLI05 is the PLI02’s little sister. Both speakers can be used to convert from balanced to unbalanced. Both speakers include line isolation transformers for galvanic isolation. They are connected between mains-operated audio devices to prevent ground loop hum. The PLI02 is designed for using XLR connectors and built for low impedances (600 ohm). In contrast, the use of jack sockets means that the PLI05 is better suited to higher impedances. It can be operated in the broad range of 600 ohm to over 10 kilo ohm. However, in order to minimise level loss, the input impedance should not be lower than the output impedance.
Today, lectures and presentations are mostly held with audio and visual media support. Connecting laptop computers to the mixing consoles of PA systems, however, can be a major problem due to incompatible connector formats. The Palmer Line Level Convertor PLI06 is a dedicated interface to feed the unbalanced stereo signal typically provided by a laptop to the balanced (mono) microphone inputs of professional mixing desks. It mixes the stereo output to mono while impedance matching and signal balancing are achieved by a high quality audio transformer especially designed for the unit. Moreover, it also prevents ground loops and the annoying hum they result in. The PLI06 is entirely passive and does not require mains power or batteries.
Connecting the PLI06
Equipment providing audio output on RCA phono sockets is connected to the PLI06's inputs using a shielded RCA stereo cable. For best results with laptops we recommend using their headphones output which is usually on a 3.5 mm miniature stereo socket. Use a shielded TRS mini jack to 2x RCA phono cable for connection to the PLI06. Place the unit close to the signal source and keep the input cable as short as possible since the unbalanced signal path is susceptible to interference. The PLI06's output is on a standard wiring male XLR connector. Use a high quality microphone cable for connection to the mixing console. Due to the balanced lo-Z signal provided by the Palmer Line Level Converter cable lengths are uncritical while interference- free signal integrity is maintained.
Providing compatibility between computers and professional equipment, the PLI04USB is a dedicated interface to feed unbalanced stereo audio from USB ports to balanced mic inputs of mixing consoles. Supporting 44.1, 48 and 96 kHz sample rates it provides high quality digital-to-analog conversion with 24-bit resolution. Signal output is transformer balanced on standard wiring male XLR connectors with individual isolating switches for the left and right channels.
Featuring a mono summing switch, the unit effectively doubles as a signal splitter to route the mono signal into separate audio systems. In addition, the PLI04USB features a headphones output with level control for convenient monitoring and a ground lift.
PRO MEDIA DI/ PLI-04. With the new PRO MEDIA DI/ PLI-04, Palmer introduces a DI-box, produced with the discerning needs of the computer-age media in mind. Using this uncomplicated method, personal computers and other consumer equipment with unbalanced outputs can be converted to balanced, in order to carry out, e.g., a presentation over a professional PA system. The PLI-04 accommodates all the common input types, TRS jacks accepting mono or stereo plugs, RCA phono sockets and a 3.5mm stereo jack input for use with the headphone output of a Laptop or similar device. The outputs are conventional transformer balanced XLR sockets, as used in professional PA systems, guaranteeing an electrically decoupled signal, a prerequisite to ensure noise-free operation. One other special feature which should not be forgotten! Although the PLI-04 is primarily a stereo unit, it can be switched to mono, with the two stereo signals summed and fed to both XLR outputs. The PLI-04 manifests a mechanically robust unit combined with outstanding technical specifications, adding to the list of high quality products that have come to be expected from Palmer.
Two-channel isolation transformer (line isolator). With cinch (RCA) inputs and outputs, especially designed for connection to notebooks, sound cards, hifi systems, etc. The PLI03 eliminates ground loops and interference signals that can be caused by the computer, for example.
Two-channel isolation transformer (line isolator). Neutrik combination socket input (XLR & jack socket) and XLR output. The PLI02 also has a ground-lift switch. Especially suitable for eliminating ground loops that cause hum. Conversion from unbalanced to balanced is possible. 600 ohm version can handle levels up to +20 dBu.
Professional dual channel line isolating unit for stage and studio use. A unique Neutrik input connector accepts both male XLR and jack plugs. The PLI-02 easily converts unbalanced outputs into balanced ones. It may also be used to transformer balance electronically balanced inputs and outputs.
Mono isolation transformer (line isolator), equipped with 1/4 TRS jack sockets at both ends for balanced and unbalanced signals. Especially suitable for eliminating ground loops that cause hum. Conversion from unbalanced to balanced is possible. A two-channel version can be found under product number PLI05. Single channel unit in a small rugged diecast box. Especially useful in guitar rack systems where multiple signal processors and preamplifiers are combined. Also eliminates noise in car hifi when used to isolate power boosters."