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P-120A & P-60A discontinued see Substitute P-125A & P-65A discontinued see Substitute
Professional 120/60 watt RMS PA amplifiers featuring built-in telephone paging, voice activated priority page, locking cannon type XLR connector mic inputs, RCA AUX inputs, additional 1/4" phone jack speaker outputs 117/220V AC 50/60 Hz. Includes rack mounting kit Professional 125/65 watt RMS PA amplifiers featuring built-in telephone paging, voice activated priority page, locking cannon type XLR connector mic inputs, RCA AUX inputs, additional 1/4" phone jack speaker outputs 117/220V AC 50/60 Hz. Includes rack mounting kit
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Professional 30 watt RMS PA amplifier featuring a digital FM/AM 30 station preset tuner, built-in telephone paging, voice activated priority page, music on hold, locking cannon type XLR connector and 1/4"mic inputs, dual voltage 117/220V AC 50/60 Hz. Includes rack mounting kit Professional 30 watt RMS PA amplifier featuring priority page, locking cannon type XLR mic inputs, RCA AUX inputs, 117/220V AC 50/60 Hz. Includes rack mounting kit


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MICROPHONES Wires and Wireless Audio Microphones


CSi P-30A P-30A Professional 30 Watt RMS PA Amplifier DISCONTINUED USE PBM-30   

PBM-30 30W Contractor Series PA Amplifier $199

add Qty: to shopping cart PBM-30 30W Contractor Series PA Amplifier $199 plus shipping

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UL Listed. Our two channel contractor series mixer/amplifier is a 30 watt amplifier. It features an auto mute function, music on hold output with separate level control (600 ohm line and one watt 8 ohm), 600 ohm telephone line input with level control, bass/treble tone controls, front panel level controls, bass and treble tone controls, front panel level controls, and manual muting contacts. In addition to the telephone line input, this unit accepts inputs from two sound sources. Each source utilizes a microphone input (terminal strip). Source 1 also offers the option of an auto summing stereo auxiliary RCA input. Outputs include a choice of 4, 8, and 16 ohm as well as 70 and 25 volt line outputs. Rack (PBM-RK1) and wall (PBM-WK1) mounting kits are available (not included).

Technical Specifications Finish Black * Frequency Response Rate 50-15,000 Hz. +/- 3 dB * Input Sensitivity/Impedance Tel: 100mV/600 ohms, unbalanced * Mic-1-2: 1.0mV/600 ohms, balanced * Aux- 1: 200mV/50,000 ohms, unbalanced *  Music on Hold 500 ohm line/1 Volt * 8 ohm/ 1 Watt * Mute Level Aux 1/Mic 2 >/= 40 dB * Power Supply 120 VAC, 50/60 Hz. * Rated Output Power 30 W RMS * S/N Ratio Mic- 1-2: Better than 55 dB * Aux- 1: Better than 70 dB * Tel: Better than 60 dB * Speaker Outputs 4 ohms, 8 ohms, 16 ohms, 25/70V line * Tone Control Bass +/- 10 dB at 100 Hz. *  Treble +/- 10 dB at 100 Hz. *  Total Harmonic Distortion 1% or less at 1 kHz. * VOX Level Mic 1/Tel 0-40 dB adjustable

CSi P-30FAP-30FA $399
30 Watts RMS PA Amp Digital
FM/AM Tuner with 30 Presets
Professional 30 watt RMS PA amplifier featuring a digital FM/AM 30 station preset tuner, built-in telephone paging, voice activated priority page, music on hold, locking Cannon type XLR connector and 1/4"" MIC inputs, dual voltage 117/220V AC, 50/60Hz - rack mounting kit included

30 Watts RMS @ less than 1% THD, Frequency Response: 30 Hz - 20,000 Hz, Noise: Mic 60 dB / Aux 70 dB / Tuner FM 60dB/AM 50dB, Sensitivity: Mic .3mV / Aux 100mV, Inputs: 2 Mic Hi or Lo Z / , Unbalanced / 2 Aux, Outputs: 4, 8 Ohm / 25 & 70V line / Booster Tape, Controls: 2 Mic / Tuner / 1 Aux / Separate bass & treble / Master volume, Dimensions: 3¾"H x 16½"W x 12-3/8"D, Weight: 14 lbs. 8 oz

bogen C35 Bogen GS100 Bogen C100 Bogen GS150 Bogen GS60 Bogen X600 bogen 250w amp TOA ER604W AMPLIVOX Portable   AMPLIVOX S355MO AMPLIVOX S470OK AMPLIPOD SW227 AMPLAVOX S230A RPA7000 RPA6000 ELECTROVOICE PA-1250T ELECTROVOICE PA-2450L ELECTROVOICE PA-4150L STEWART PA100B TOA CA-130 TOA CA-160

MICROPHONES Wires and Wireless Audio Microphones


COMMERCIAL audio overview

What is a 70 Volt Sound System & what is it used for?

A 70 Volt Sound System is comprised of amplifiers, speakers with transformers, microphones, volume controls, a telephone system interface and an assortment of wires used as connections. It is generally used for commercial sound applications where there is a necessity for electronically amplifying and distributing sound for the functions of paging, playing music and/or pre-recorded messages to a commercial environment.

What are the components that make up a 70 Volt Sound System?

Centralized Amplifier: The central unit of a 70 Volt System is the amplifier that amplifies the sound signal to be distributed to pre-established speakers or paging horn loudspeakers. There are power amplifiers, which are rack-mountable and have no external controls, and packaged amplifiers, which have pre-amp features such as volume controls, bass and treble controls, etc., that are built into the amplifier to make it a pre-amplifier and amplifier all in one unit. Amplifiers have many diverse features and many input and output connections. They can feature XLR MIC Connectors or MIC terminal strip connections, auxiliary/RCA inputs for music sources, and 600 ohm telephone inputs. Most commercial amplifiers have speaker outputs for 4/8/16 ohms and 70V systems. Most Speco Technologies amplifiers offer a ‘Music on Hold’ output feature to allow customers on hold to hear music or prerecorded advertising.

Speakers: There are several different types of speakers including in-ceiling, in-wall, baffle and flush-mount cone speakers or horn loudspeakers. Optimal speaker selection for each installation can depend on the application the speaker is needed for. It can also depend upon the area that is needed to be covered, the ambient noise level of the environment, whether the application for the speaker will be foreground/background music or voice, and whether the speaker will be used indoor or outdoor. For commercial applications in a 70 Volt System, the speaker must have a transformer mounted on it to be used.

TRANSFORMERS: The transformers that are used on 70 Volt System speakers are step-down transformers that convert the high-voltage/low-current coming from the amplifier to the low-voltage/high-current signal that makes the speaker work. Each transformer usually has multiple wattage taps so that each speaker can be individually set as to how much wattage will enter the speaker, and, because of this, how loud each speaker will be. The benefits of using transformers are listed on the next page. Transformers can be sold individually to be mounted on a speaker or premounted already on a speaker.

Phone System Interface Device: TLT-1   These systems are used to connect a phone system to the speaker system via the amplifier for paging purposes.

Microphones: Located in the front end of the system to receive the delivered sound, microphones are low impedance devices that require a shielded cable so as to not to interfere with the amplifier or speaker wires.

• Wires: Generally speaking, :SPEAKER wire is determined by the length of the run and wattage utilized:

For wire runs less then 50 ft. and 50 Watts of power or less use 16 wire gauge.

For wire runs more than 50 ft. or over 50 Watts of power use 14 gauge wire.

Volume Controls , Attenuators, L-Pads: Allows adjustment of volume to speakers.

What are the Benefits of Using a 70 Volt Sound System?

• A 70 Volt System uses a basis of high voltage to result in a lower current when distributing power to a sound system. Since Power equals Voltage times Current, a higher voltage will result in a lower current needed to arrive at a desired power load. This prevents long runs of wire from getting overheated by not having excessive, wasted current. This makes 70 Volt Systems very energy efficient. Many municipalities in America actually require the use of 25 Volt transformers because the municipalities' electrical codes classify a 25 Volt system as low voltage, thus making it safer.

• Generally speaking, 70 Volt Systems are much more cost efficient than an 8 ohm speaker system when dealing with the volume installation of speakers.

• 70 Volt Systems are easier to design than 8 ohm speaker systems. The designer does not have to worry about keeping the impedance matched throughout their speaker system as they would on an 8 ohm based system. 70 Volt Systems can have their speakers daisy chained in parallel together without worry. Because 70 Volt speakers come with transformers, impedance is not an issue unless an extreme amount of speakers are installed together. (It is recommended to use multiple wire runs back to your amplifier as opposed to a single run.) This will make locating problems that occur easier to find by isolating it on individual small speaker runs where it can be quickly located.

Also it is an easy calculation in determining the amount of wattage needed by your amplifier. You will take the total wattage

 equirement of your 70 Volt speakers, or "load", and include a 20% safety buffer to the upside arriving at the minimum RMS wattage your amplifier should have.

• 70 Volt Systems allow you to set the volume of each individual speaker by letting you customized the wattage taps on the speakers for the specific volume needed in your specific sound area. The higher the wattage taps are set on individual speakers, the more power the speaker consumes, the louder the speaker will be. The transformer on the speaker also serves as a safeguard to make sure individual speakers are not ruined by excessive wattage.


More information on Home speaker Speakers

more information on in wall speakers



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