LEGACY Metro XD Subwoofer System Owner’s Manual
- June 6, 2024
- Legacy
Table of Contents
Owners Manual For The
Metro XD
Subwoofer System
Owners Record
Thank you for selecting a Legacy subwoofer. This handcrafted instrument will
provide you with many years of listening enjoyment.
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 XD
Serial No:——————————————
Date of purchase:——————————–
Register your product at
legacyaudio.com/register
Share your Legacy speakers with the Legacy community. Post your Legacy
experience and system photos at facebook.com/LegacyAudio. Like the page to
continue receiving the latest Legacy announcements.
The Cabinetry/Our Commitment
Handcrafted
Beneath the surface of Metro XD’s elegant exterior lies rigid MDF
construction. Interlocking joinery maximizes the strength of the cabinet
parts.
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.
Our Commitment
A great deal of forethought, love, and satisfaction is instilled in each piece
of Legacy workmanship. We take pride in getting to know many of our customers
on a first-name basis.
Your purchase of this product is backed by the renowned Legacy warranty.
Warranty
Legacy Audio supports its customers and products with pride. We cheerfully warrant the loudspeaker 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 proof of purchase in order to honor the warranty – so please keep your receipt.
- The warranty applies to the original owner and is not transferable.
- The warranty applies to products purchased from an “Authorized Legacy Dealer”.
- The warranty on active components such as digital processors or internal amplifiers is limited to three (3) years of coverage.
- The warranty on dealer stock will extend for a maximum of two years from the invoice.
The warranty does not cover transportation costs of the product to or from the customer, distributor or dealer, or related shipping damage.
Exclusions from Warranty
The following situations or conditions are not covered by the Legacy Audio
warranty:
- Accidental damage, electrical abuse (such as burnt or jammed voice coils), or associated equipment failure.
- Use inconsistent with recommended operating instructions and specifications
- Damage caused by modification or unauthorized service
- Costs associated with the removal and reinstallation of defective products. Consequential damage to other products.
- Normal wear such as fading of finishes due to sunlight.
Unpacking Your Speakers
Your new subwoofer has been very carefully packaged to ensure that it travels to you safely. Each subwoofer is protected by a double-wall outer carton with heavy V-board corner protectors. Custom fitted foam end caps are used to protect the elegant cabinetry, and a custom bag is included to provide further protection. Please save this packing for future transportation. If cartons become damaged or misplaced, new ones can be purchased from Legacy Audio.
Included in your packaging, you will find four isolation pucks. We strongly encourage you to use these as they prevent transmission of energy from the subwoofer into the floor, which causes vibration.
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 panel controls will lead to a seamless
transition.
Low-frequency reinforcement occurs whenever woofers are placed near room
boundaries. The distance from the walls, floor, and ceiling corresponds to the
wavelengths of the frequencies which will reflect IN-PHASE and thus reinforce
bass output. Therefore, the actual dimensions of your listening room play a
definite role in what ultimately arrives at your ear.
We can calculate what the most strongly reinforced frequencies in a room will
be by the formula shown below: Resonant Frequency = (1130 ft/sec) / (ft.
between boundaries x 2)
For example, a room with an 8 ft. ceiling height has a strong resonance at:
(1130 ft/sec.) / (8 ft. x 2) = 71 Hz.
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 the 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. It will also excite the maximum number of room modes and
decrease distortion.
A best-case scenario is to actually use two subwoofers, one to each side of
the listener. The subs should be placed 90° out of phase with each other. This
improves spaciousness and bass uniformity, with a reduction in room level
peaks.
Speaker Connections
Once you’ve found a place in your room, the next step is to connect the Metro
XD to your existing system. Listed below you will find 3 options.
Option 1: Connecting the Metro XD 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.
If using Left/Right output jacks from the preamp, the internal circuit module
of the Metro XD will sum the two channels together. When using the left and
right low-level inputs on the subwoofer, the internal crossover of the
subwoofer is being used. The crossover frequency and level will be controlled
by the appropriately labeled controls on the rear panel of the sub.
Option 2: Connecting single sub out
Sub Input: Use for a Pre-Amp/Receiver with an adjustable low pass crossover
setting, allowing you to control the crossover point at the Pre-Amp/Receiver
and bypass the Metro Pre-Amp controls
Left (Mono) Input: Use for a Pre-Amp/Receiver that does not have an adjustable
low pass crossover setting, allowing you to manage the signal with the Metro
Pre-Amp controls.
Option 3: The Metro XD provides an XLR input jack for balanced left and right stereo connections from your preamp or processor
Powering Up Metro XD
-
Power Cable: The supplied power cable will plug into the socket on the back of a terminal plate of the unit.
NOTE: Try to plug into the same AC circuit as the rest of your audio system, as this avoids hum from ground loops. -
Power Up: On the rear of the subwoofer adjacent to the power cable socket on the back panel is the power switch. This switch controls current flow to the entire unit as
follows:
I = On
0 = Off
Fine Tuning
Adjusting the Metro XD Subwoofer
On the back panel of the Metro XD Subwoofer you’ll notice four controls:
Level, Freq., Blend 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 it with your main speakers.
Level (Min/Max): This will allow you to adjust the output volume of the
subwoofer.
When using a theater processor, the level & crossover frequency can be
controlled remotely with the subwoofer level control knob left at the 3
o’clock position.
Freq.: This control selects the range of low-frequency content that will
be reproduced. The crossover filter can be varied to pass frequencies below
40Hz and up to 150 Hz.
Blend: Turning the knob counter-clockwise reduces energy from the
subwoofer in the range of 35-50 Hz. Turning the knob clockwise will increase
gain in this area. This can reduce excessive energy or give more low-frequency
impact in this range depending on the setting. This control is very similar to
that of a graphic EQ. The 3 o’clock position is neutral. The center frequency
of this control has been carefully chosen to match the first cancellation node
of most rooms.
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.
Here is an effective method of accomplishing this:
While seated at your listening position, have someone sweep the phase control
slowly from one extreme to the other.
Using pink noise or a 50-60 Hz test tone, listen for the strongest output. Now
take note of that setting. Next, play music program material and optimize the
level and phase settings further; adjusting for the smoothest output.
Designer Notes: Room Resonances
*The following information is not essential to operating your subwoofer but is provided for enthusiasts who wish to further their understanding.
Three types of acoustical resonances occur in all bounded (non-anechoic) listening environments; tangential, oblique, and axial. Simple axial resonances occur directly between 2 parallel boundaries and have a very strong impact on the pressure response in a room. Peaks as great as 6dB, with dips averaging -15 to -45dB occur in most rooms. Troublesome dips as great as -60dB can occur in poorly designed acoustical environments. Resonances cannot be equalized away, as they are positionally dependent. Boosting power to compensate a node will add overwhelming output at the complimentary anti-node.
Designer Notes: Subwoofer Boundary Reinforcement
Corner Placement
The plots to the right summarize the boundary influences on a corner placed
subwoofer. Shown are frequency response effects for a cubical room (Least
Optimal) compared to a room with “Golden” ratios (Most Optimal).
The top graph demonstrates the strong cancellation caused by excessive
architectural symmetry. Note 9dB of gain below K=0.2 followed by a large
energy suck-out between K=0.2 and K=0.4. This cancellation notch is more than
11 dB deep and an octave wide.
The lower graph represents the same dimensional ratios found in classic
architecture such as the Greek Parthenon. Note again, 9dB of low-frequency
gain is realized but with less than +/-1dB of ripple above K=1.2.
Specifications
| System Type:| Subwoofer, pneumatically coupled
---|---|---
Subwoofer:| 12″ spun aluminum diaphragm, 480oz motor structure, cast frame, 3″
dual 4 layer voice coil
Sub-Bass Radiator:| 15″ mass loaded down firing
Low-Frequency Alignment:| 6th Order
Internal Amplification:| 750w, Class D ICEpower
Freq. Response (Hz, +/-2dB):| 20-150
Impedance:| 10k
Phase Adjustment:| Cont. +/-180
Blend EQ:| (+/- 12dB@45Hz)
Max. SPL:| 118dB @ 1m
Low Pass Filter Slope:| 18 dB per octave
Crossover Hz:| 40-150
Inputs:| LFE, L/R RCA, balanced XLR
Cabinet Dimensions (in):| 16 x 16 x 16
Shipping Dimensions (in):| 22.63 x 22.5 x 21.75
Cabinet Weight:| 68 lbs
Shipping Weight:| 123 lbs
CE Declaration of Conformity
Legacy Audio
3023 E. Sangamon Ave.
Springfield, IL 62702 USA
800-283-4644
States that this product is in conformity with the essential requirements and
other relevant provisions of:
Low Voltage Directive 2006/95/EC
EMC Directive 2004/108/EC
All information contained in this manual is accurate to the best of our knowledge at the time of publication. In keeping with our policy of ongoing product improvement, we reserve the right to make changes to the design and features of our products without prior notice.
| WEEE Compliance
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., Springfield, IL 62702, USA—
Phone: +1 217 544-3178.
---|---
Notes:
©2021 Legacy Audio
3023 E Sangamon Ave.
Springfield, IL 62702
Phone: 800-283-4644