Model 4.5 PBM
High Performance Powered Subwoofer
Atlantic Technology®
I N N O V A T I V E H O M E T H E A T E R
343 Vanderbilt Avenue Norwood, MA 02062 (781) 762-6300 www.atlantictechnolgy.com
Manual Instruction
Model 4.5 PBM MODEL 4.5 PBM
High Performance Powered Subwoofer
Congratulations on your purchase of an Atlantic Technology 4.5 PBM powered subwoofer. With proper care, your new subwoofer will provide many years of trouble-free, high quality bass reproduction.
The 4.5 PBM is capable of delivering very high output levels and a wide dynamic range with smooth in-room response down to approximately 30 Hz, with a peak SPL of 105dB.
The built-in proprietary high-current Class G amplifier is conservatively rated at 150 watts RMS. This amplifier, coupled with the massive 10" long-throw woofer in a sealed, acoustic suspension enclosure, generates musical, accurate deep bass with a minimum of distortion.
Your Atlantic Technology powered subwoofer will smoothly integrate with virtually all other brands of loudspeakers on the market. All of its internal electronics have been designed to maintain optimal signal integrity. From the premium quality gold-plated connectors to the clearly marked controls, this is one of the most versatile high performance subwoofers you can buy. An added benefit is its unusually compact size and elegant design.
Features
Your Atlantic Technology 4.5 PBM powered subwoofer was engineered using the latest technology and finest components available. It features:
●A long-throw 10" driver with a vented motor structure and 2" high temperature voice coil.
This powerful driver has a very stiff non-resonant cone that acts as a perfect piston throughout its operating range. Its massive motor assembly and high temperature components mean high performance and exceptional reliability.
●A sealed acoustic suspension enclosure for low distortion and deep bass output.
Acoustic suspension designs are inherently low in distortion and naturally deliver deep, smooth bass response. As with all Atlantic Technology subwoofers, we have paid inordinate attention to giving you accurate musical bass reproduction along with terrific special effects.
●A linear power high current discrete Class G amplifier conservatively rated at 150 watts RMS.
Atlantic Technology’s advanced Class G amplifiers utilize dual low voltage/high voltage power supplies for exceptional power delivery from a compact, efficient package. One power supply operates during all “normal” demand periods. But when a high demand peak signal appears at the subwoofer input, the second, high voltage supply immediately switches in to dramatically boost the amplifier’s low distortion output capability. The amplifier delivers very high power levels from a compact and efficient package. It consumes less steady-state power and produces much less heat than standard amplifier designs for longer more reliable operation. The 4.5 PBM’s custom designed amplifier has been precision matched to the 10" driver. It exerts accurate and powerful control over the driver for the best performance possible.
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Atlantic Technology®
●A useful working frequency range from 30 Hz to 150Hz.
●A Dual Diversity CrossoverTM (DDC) system with an adjustable (50 Hz to 150 Hz) 12 dB per octave low-pass crossover, and a fixed 24 dB per octave “voice filter” at 180 Hz.
This unique crossover’s upper end roll-off slope is an extremely steep 12 dB + 24 dB per octave, totaling 36 dB per octave above 180 Hz. It allows for exceptional integration with most any brand or type of speaker on the market. We have developed this unusual design to eliminate any possibility of out-of-band information being audible from the subwoofer and thereby making it localizable.
The DDC filter is incorporated in the 4.5 PBM because this subwoofer has been design matched to the Atlantic Technology 4.5 ultra-compact Home Theater speaker system. If you are using the subwoofer with very small satellites (like the 4.5 L /C/ R units) which have limited mid-bass output you have to cross over the subwoofer at a fairly high frequency. Since the 4.5 Left / Right / Center speakers are specifically designed to eliminate all frequencies below 125 Hz, their mating subwoofer must reproduce these sounds. However, it’s critically important that all sounds above this frequency be eliminated from the subwoofer, in order to make for perfect system integration. This is because higher frequencies are your ears’ clues to where sound comes from. The innovative DDC 36 dB crossover in the 4.5 PBM ensures precise and seamless system integration with compact satellite speakers. A subsonic filter is also incorporated to filter out inaudible ultralow frequencies that can rob amplifier power.
●Two line inputs, two line thruputs.
The thruputs allow daisy chaining of multiple subwoofers, or can act as a return path back to the processor.
●Two high level inputs, two high level thruputs.
These let you connect the subwoofer to your amplifier using the amplifier’s speaker outputs. Once again, you can daisy chain to another subwoofer using the unmodified signal that comes out of the thruput connectors.
●A phase inversion toggle switch (0/180 degrees).
This switch allows precise acoustic matching with many systems whose output may be phase reversed. This switch will also allow you to compensate for unusual room acoustics that occur when the woofer is physically separate from the midrange/high frequency units. Be sure to try the Phase switch in both positions whenever you set up the 4.5 PBM or when you change the built-in crossover settings, since the crossover and the Phase switch interact with each other acoustically.
●A front panel variable volume level control.
●Automatic standby operation.
Automatic standby features a 7-10 minute turn-off delay and a front panel multi-color LED status indicator.
●An IEC AC power input socket.
Your subwoofer comes supplied with a heavy-duty detachable power cord.
●Design and construction to meet all UL/CSA and European safety requirements.
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Model 4.5 PBM
Connecting Your Subwoofer
The Atlantic Technology 4.5M Powered Subwoofer is simple to hook up, offering several connection methods for maximum flexibility. Study the system diagrams starting on page 6. Once you have found the example which most closely matches your system, hook up your subwoofer(s) as shown in that diagram.
IMPORTANT NOTE: If you are using the complete System 4.5 with a surround processor that includes its own filtered subwoofer output we strongly recommend that you connect the 4.5 PBM to your system using the speaker or high level inputs. This is because most processor internal crossovers are only 12 dB per octave, which is not steep enough for use with the higher crossover levels required for ultra-compact satellites. Only use the low level RCA inputs when the processor outputs unfiltered signals. Should your processor include a 120 Hz or higher crossover, you may connect it to the low level inputs on the 4.5 PBM.
When using the recommended high level speaker connections and a discrete 5.1 channel receiver/processor (Dolby Digital, DTS, etc.), set the center channel and surround speakers to the “Small” setting, and the front left and right speakers to “Large.”
Figure 1:
Amplifier panel and controls for Model 4.5 PBM
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