Owners Manual For The Metro Subwoofer System
Table of Contents Registration Owners Record The Cabinetry / Our Commitment Warranty Setup Unpacking Your Speakers Speaker Placement Hooking Up Cables Speaker Connections Fine Tuning Page 3 4 5 6 7-8 9-10 11-13 14-15 Technology Specifications 16 2
Owners Record The serial number is located on the rear of the unit. Record this number in the space provided below. Refer to this when calling your dealer regarding this product. Model: Metro Serial No: Date of purchase: Thank you for selecting a Legacy Loudspeaker System. These handcrafted instruments will provide you with many years of listening enjoyment.
The Cabinetry / Our Commitment Handcrafted Beneath the surface of Metro’s elegant exterior lies rigid MDF construction. Interlocking joinery maximizes the strength of the cabinet parts. Polyester fiberfill is selected for internal damping. A sharp rap on the enclosure will leave you with little more than bruised knuckles. Each cabinet is impeccably finished on all exposed surfaces with select veneers. The exquisite finish is hand-rubbed several times to assure a patina at home with the most elegant decor.
Warranty Legacy Audio supports its customers and products with pride. We cheerfully warrant our loud- speaker products we manufacture from defects in materials and workmanship for a period of seven (7) years. Electronic components such as internal amplifiers and digital processors are covered for three (3)years. Please register your product with Legacy Audio. Should you require service Legacy will require a proof of purchase in order to honor the warranty - so please keep your receipt.
Unpacking Your Speakers Your new speaker system has been very carefully packaged to insure that it travels to you safely. Each speaker is protected by a double- wall outer carton with heavy V-board corner protectors. Molded foam end caps are used to protect the elegant cabinetry, and a plastic liner is provided as waterproofing. Please save this packing for future transportation. If cartons become damaged or misplaced, new ones can be purchased from Legacy Audio.
Speaker Placement Since the human ear is rather poor at localizing radiation frequencies below 125 Hz, good results may be obtained in a variety of room placements. Careful adjustment of the convenient front panel controls will lead to seamless transition. Low frequency reinforcement occurs whenever woofers are placed near room boundaries. The distance from the walls, floor and ceiling correspond to the wavelengths of the frequencies, which will reflect in phase and thus reinforce bass output.
Speaker Placement Now, while such reinforcement might actually be beneficial at very low frequencies, excessive excitation can cause “overhang” or a droning effect at mid-bass frequencies. A way to minimize excitation of these resonances is to place your subwoofer asymmetrically relative to room boundaries. For instance, if the subwoofer is 2 ft from one corner wall, then place it 1.5 ft to 3 ft from the other. Placing the subwoofer in a corner will reduce the radiation angle and thus increase efficiency.
Hooking Up Cables The ideal conductor would have negligible resistance, inductance and capacitance. The table below shows how a few actual speaker cables measure up. Cable 12 ga. 14 ga. 16 ga. 18 ga. Ωs/ft 0.0033 0.0048 0.0079 0.0128 pF/ft 24 17 16 28 µH/ft 0.21 0.13 0.18 0.21 Capacitance is considered insignificant in each cable because its ef- fect is well out of the audio bandwidth; inductance can be de- creased (at the expense of increased capacitance) by keeping the conductor pair closely spaced.
Hooking Up Cables What about phase shift due to frequency dependent travel times down the speaker cable? Measurements show that 100 Hz waves will be delayed about 20 billionths of a second behind 10 kHz waves when traveling to the end of a 10 foot speaker cable. Since the cilia of the ear requires 25,000 times longer than this just to transmit phase information, phase shifting is obviously not the primary concern when considering speaker cables. What about resistance? Finally we are getting somewhere.
Speaker Connections Once you’ve found a place in your room, the next step is connecting the Metro to your existing system. Listed below you will find 3 options. Option 1: Connecting the Metro using the stereo Low Level preamp/processor inputs. NOTE: if using the low-level inputs, we suggest using cables that are no longer than 5 meters. Longer lengths of RCA cable can result in greater noise and attenuation of the signal.
Option 2: Connecting single sub out Connect the preamp/processor’s “sub out” to the left channel RCA input (mono). Option 3: Connecting the Metro using the High Level Inputs (from amplifier) If using the high level inputs it is highly recommended that you connect them in parallel with your main left and right loudspeakers. NOTE: DO NOT use the output from a differential Monobloc amplifier as a high level input to the subwoofer.
Speaker Connections Powering Up Metro 1. Power Cable: The supplied power cable will plug into the socket on the back terminal plate of the unit. NOTE: Try to plug into the same AC circuit as the rest of your audio system, as this will avoid hum from ground loops. 2. Power Up: In the rear of the subwoofer to the immediate left of the power cable input is the power switch.
Fine Tuning Adjusting the Metro Subwoofer On the back panel of the Metro Subwoofer you’ll notice four controls: Level, Freq., and Phase. These allow an extraordinary amount of control over your subwoofer. These controls will allow you to tailor the sound of the sub to your room and integrate with your main speakers. Level (Min/Max): This will allow you to adjust the volume level played by the subwoofer.
Fine Tuning Phase (0 °/-180 °): This control is essential in the proper setup of your subwoofer. If not set up properly, your main speakers and subwoofer can actually work against each other. If operating out-of- phase the subwoofer and mains will cancel, creating nulls at some frequencies (primarily upper bass).What is desirable is to have the subwoofer and the mains operating in phase, relative to the primary listening position.
Specifications System Type: Subwoofer, pneumatically coupled Subwoofer: Aura 12" spun aluminum with encapsulated neo motor Radiator: Down-firing 15" Low Frequency Alignment: 6th Order Internal Amplification: 500 watt, Class D Freq. Response (Hz, +/-2dB): 20-150 Impedance: 10k Phase Adjustment: Cont. +/-180 Blend EQ: Level Control Max.
WEEE Compliance CE Declaration of Conformity Product Disposal— Certain international, national and/or local laws and/or regulations may apply regarding the disposal of this product. For further detailed information, please contact the retailer where you purchased this product or the Legacy Audio Distributor in your country. A listing of Legacy Audio Distributors can be found on the Legacy Audio website www.legacyaudio.com or by contacting Legacy Audio at: 3023 E. Sangamon Ave.
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©2013 Legacy Audio 3023 E Sangamon Ave.
