User's Manual

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Operating Instructions for the

No.25

Sub-Bass System

REL Acoustics Limited

North Road, Bridgend Industrial Estate

Bridgend, CF31 3TP

United Kingdom

Telephone: +44 (0)1 656 768 777

Fax: +44 (0) 1 656 766 093

Web:

www.rel.net

PAGE BREAK

Caution Marking Explanation

The lightning flash with arrowhead symbol within an equilateral triangle is intended to

alert the user to the presence of un-insulated dangerous voltage within the product’s

enclosure that may be of sufficient magnitude to constitute a risk of electric shock to

persons.

The exclamation point within an equilateral triangle is intended to alert the user to the

presence of important operating and maintenance (servicing) instructions in the literature

accompanying the appliance.

IMPORTANT SAFETY INSTRUCTIONS [major heading]

Read all of these instruc

ons.

2 Save these instructions for future use.

3 Heed all warnings.

4 Follow all instructions.

5 Do not use this apparatus near water.

6 Clean only with automotive polish and micro fiber cloth.

7 Install in accordance with the manufacturer’s instructions.

8 Do not install near any heat sources such as radiators, heat registers, stoves or other apparatus

(including amplifiers) that produce heat.

9 Do not defeat the safety purpose of the grounding-type plug. A grounding type plug has two blades and a

third grounding prong. The third prong is provided for your safety. If the provided plug does not fit into your

outlet, consult and electrician for replacement of the obsolete outlet.

10 Protect the power cord from being walked on or pinched particularly at plugs, convenience

Summary of content (19 pages)

PAGE 1
Operating Instructions for the No.25 Sub-Bass System REL Acoustics Limited North Road, Bridgend Industrial Estate Bridgend, CF31 3TP United Kingdom Telephone: +44 (0)1 656 768 777 Fax: +44 (0) 1 656 766 093 Web: www.rel.
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receptacles, and the point where they exit from the apparatus. 11 Only use attachments/accessories specified by the manufacturer. 12 Use only with a cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over. 13 Unplug this apparatus during lightning storsm or when unused for long periods of time. 14 Refer all servicing to qualified service personnel.
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Attention Explication Marquage L'éclair avec le symbole de pointe de flèche dans un triangle équilatéral est destiné à alerter l' utilisateur de la présence de non isolée tension dangereuse à l'intérieur de l'enceinte du produit qui peut être d'une ampleur suffisante pour constituer un risque d'électrocution pour les personnes .
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fonctionne pas normalement , ou a été échappé . 15 10cm distance minimale autour de l'appareil pour une aération suffisante; 16 il convient que l'aération ne soit pas gênée par l'obstruction des ouvertures d'aération par des objets tels que journaux, nappes, rideaux, etc.
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Scale and Power: There is, as the saying goes, no replacement for displacement. Our development of a super, light, fast 15 inch driver was no easy task and it took quite some time to find a manufacturer capable of building to our standard. Anyone can build a big, loud 15 inch driver; the hard part lies in keeping it lightweight and yet stiff enough to hold up to the rigors our customers regularly put their units through. 160 square inches, capable of moving 2” fore and aft (total stroke of 100mm or approx.
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John Hunter PAGE BREAK REL No.25 Rear Panel Connection Legend [major heading] 13 14 15 1 2 16 3 17 4 9 10 5 6 7 8 11 12 REL NO.25 Rear Panel Connection Legend 1 .1/LFE RCA Input: Used to connect to the .1/LFE output of a surround-sound processor. 2 .1/LFE RCA Output: Used to connect or “daisy chain” another REL No.25 in tandem.
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5 High Level Input (Neutrik Speakon): Used to connect to the main front amplifier speaker terminals. 6 High Level Output (Neutrik Speakon): Used to connect or “daisy chain” another REL No.25 in tandem. 7 .1/LFE Balanced Input: Balanced (XLR connector) version of .1/LFE Input. For use only with fully balanced cables. 8 .1/LFE Balanced Output: Balanced (XLR connector) version of .1/LFE Output. For use only with fully balanced cables. 9 Power On/Off Switch: Use to turn unit on or off.
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Connectivity and Functionality [major heading] High-Level Input Connections should be made to the same binding post on main amplifier as the main speakers. Red to amplifier main right speaker red terminal, yellow to amplifier main left speaker red terminal and black to amplifier main speaker black terminal, right or left but not both. Plug the Neutrik® Speakon® plug into the HI LEVEL Speakon® socket. .1 Input This requires a RCA to RCA or XLR to XLR cable and is a dedicated true .1 channel.
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Ambient Control No.25 has an array of ambient lights on each side, outboard of the feet. The intensity of these lights can be controlled with the 4 position AMBITET CONTROL switch. Starting with the switch in the far counter clockwise position, the lights are off, as the switch in moved to the next three positions, the intensity will increase. The ambient lights can be triggered off for theater viewing with a common 12VDC trigger.
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high-level connection underpins the main front speakers. The main front speakers should be set to the ‘large’ option on the processor. See “theatre Applications” for more information. PAGE BREAK REL Set-Up Made Simple [major heading] REL products are not traditional subwoofers, but true Sub-Bass Systems. A REL is designed to augment the performance of “full range” speaker systems in order to provide, in certain cases, linear response below 15 Hz.
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PLACE BALANCED DIFFERENTIAL CONNECTION GRAPHIC HERE NOTE: No.25 models are equipped with internal circuitry to allow connection to many Class-D (digital) amplifiers. Warning: Do NOT connect the Black wire to the main Class D power amplifier’s speaker ground terminal. Some Class D amplifiers produce positive voltage at the amplifier’s speaker ground terminal (black) and connecting the REL’s ground will produce an undesirable shorting to ground.
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1a.Stereo Set-Up of No.25: (see page 21 through 23 for Stereo Set-Up procedure).When this step has been completed, proceed to Number 2, immediately below. 2 The Process: To begin the set-up process, choose a piece of music that has a repetitive bass line that is very low in frequency. We suggest track 4 from the soundtrack to Sneakers (Columbia CK 53146).
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will be lacking in bass depth and dynamics. The proper crossover point and volume setting will increase overall dynamics, allow for extended bass frequencies, and improve soundstage properties. Note, volume adjustments may need to be made to offset the effects of crossover changes. In general, when selecting a lower crossover point, more volume may need to be applied. Higher crossover frequencies will generally necessitate less gain.
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terminal outputs based on the following diagrams for standard stereo amp, non-balanced mono blocks or balanced differential mono blocks. (Insert 3 diagrams here) Expert Set-Up: Preferable is to bring the subs further out into the room and place them slightly behind and outboard of the main speakers. 1 Set each side up independently. Disconnect the sub that is not being set-up so your complete focus can be given over to the sub that is being set-up.
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output level, crossover point, phase, etc. adjusted individually. For multi-channel home cinema systems, the same procedure is followed except a RCA-to-RCA cable is also used to connect the first sub-bass system “.1/LFE OUTPUT” to the “.1/LFE INPUT” of the second unit. As is typical for REL, both high-level and .1/LFE inputs can be used together and adjusted independently offering the ability to blend both signals to your taste.
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The amplifier is inherently stable and will retain its characteristics over very long periods of time – important in a unit designed for an exceptionally long working life. These amplifiers are designed to withstand reasonable abuse and overloads. If in doubt, please contact your dealer. We believe that the importance of the electronics, cabinet and drivers being designed to work in harmony is paramount. This belief allows No.25 to achieve the highest possible level of fidelity.
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standby function. Alternatively, the user has the option to leave the unit in the normal operation mode at all times by selecting the “ALWAYS ON” position of the power mode switch. Leaving a REL on, produces the best sonic performance and the most reliable operation. In this mode, the unit will not enter standby regardless of whether or not there is activity at the input. Using this setting ensures that the No.25 is ready to react instantaneously to bass transients, whether in music or films. The REL No.
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Model Power Draw at Standby No.25 > 0.5 Watts Power Draw at Standby w/ wireless > 1 Watt Power Draw at Idle 40 Watts PAGE BREAK No.25 Specifications Type: Closed box, front firing woofer Drive Unit: 15 in., 100mm long throw, carbon fiber cone with inverted carbon fibre centre cap.
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Protection System Fully Electronic with SET-SAFE: Yes DC Fault: Yes Output Short: Yes Mains Input Voltage: 220-240 volts, 110-120 volts for certain markets Fuses: 7 Amp semi delay 230 volts operation 15 Amp semi delay 115 volts operation Dimensions W x H x D, Inc. Feet: Including feet and rear panel controls 29 x 21.3 x 30 in., (736.5 x 540 x 762 mm) Add 1.75 in (44.5 mm) in depth when using high level connector Net Weight: 152 lbs.