CARVIN BR15 Bass Amplifier Instruction Manual

**CARVIN BR15 Bass Amplifier Instruction Manual

**

Congratulations on your purchase of the Carvin BR12/BR15 bass amplifier. For over 40 years we have been building bass amplifiers, so you can expect award- winning performance from these compact professional bass systems.

BASS SIGNAL PROCESSING

The preamp of a bass amplifier is the key to great tone. The first item in the amp’s signal chain is the internal Class A discrete preamp circuits. Class A preamps circuits are renown for their superior sonic detail. Secondly, your BASS, MID sweep & TREBLE controls are powerful active circuits, which will add flexibility in generating your tone. The BX120 head also features a 5 BAND GRAPHIC EQ allowing you to put the final touches on your sound from specialized filters designed just for the bass guitar.

The BR12 and BR15 continues with features that are only found in the most comprehensive bass rigs. A COMPRESSOR, which is sought out by most professionals, is featured because it controls the overall level of the amp regardless of where the volume control is set. You can now control your peaks without the amp getting too loud or keep the amp from distorting. You may easily add to your signal processing with an effects processor to enhance your sound. Any device from a foot pedal to a full effects rack can be plugged into the rear of the “buffered” Send / Receive

EFFECTS LOOP.

The preamp LINE/PHONES jack can also be used as a main output from the preamp to send your signal to a mixing console or another high powered amplifier, allowing you to use the full complement of signal processing from your unit.

COMBO CABINET DESIGN

Part of the success of the BR12/BR14 combo amplifiers are their lightweight design and high performance. A cabinet tuned to the speakers parameters in each system adds to the speaker’s efficiency in the 35 Hz to 50 Hz range, resulting in overall warmth and a bigger, rounder sound. The BRseries combo’s also feature a 1”Titanium HF Driver to extend the upper range to 16k Hz, enhancing the harmonics for percussive slap. The 1” Titanium HF Driver is fully adjustable from
a variable rear control. All enclosures are covered in durable black
DuraTuff II™ for your transporting protection.

POWER AMP

Pure, clean bass power is delivered to your speaker from the BR12/BR15 series ultra-low distortion power amp. Turn-on muting, short circuit and thermal overload circuits protect your speakers and amp form accidental overloads.
( Note: It is normal for the amp to get warm to the touch).

RECEIVING INSPECTION—read before getting started

INSPECT YOUR AMP FOR ANY DAMAGE which may have occurred during shipping. If any damage is found, please notify the shipping company and CARVIN immediately. SAVE THE CARTON & ALL PACKING MATERIALS. In the event you have to re-ship your unit, always use the original carton and packing material. This will provide the best possible protection during shipment. CARVIN and the shipping company are not liable for any damage caused by improper packing. SAVE YOUR INVOICE. It will be required for warranty service if needed in the future. SHIPMENT SHORTAGE. If you find items missing, they may have been shipped separately. Please allow several days for the rest of your order to arrive before inquiring. RECORD THE SERIAL NUMBER on the enclosed warranty card or below on this manual for your records. Keep your portion of the card and return the portion with your name  and comments to us, or you may register online at www.carvin.com/registration.

GETTING STARTED QUICKLY

Turn the amp on and volume off, set the tone controls at their mid “0” center position, turn the compressor and noise gate off and set the 5 band graphic EQ to the their center/mid positions. Plug your amp into the AC voltage and then plug in your bass. Now, turn the amp’s power switch ON and gradually raise the volume. Re-adjust the contour and tone controls as needed and your ready to go.

Specifications:

Freq. Response: 20 Hz to 20k Hz ±3 dB
THD: Typically less than .1%
RMS Power: 120 watts @ 4 ohms
Direct Out: XLR jack, GND Lift, and Level
Contour: FLAT to 250Hz/-8DB MID Cut
Tone Controls: LO: 80Hz ±12dB
(3 band with mid sweep) MID: 200-2KHz ±12dB
HI: 8KHz ±12dB
Compressor: up to 30dB reduction
Comp Thresh/Ratio: -7 to -27 dB, 3:1 ratio 5 Band Graphic EQ: 80Hz, 250Hz, 500Hz, 800Hz, & 2kHz, ±12dB
Cabinet Freq. Resp: BR12: 50 Hz to 16k Hz BR15: 41 Hz to 16k Hz
Cabinet Types: Sealed enclosure
Cabinet Construction: Baltic Birch Plywood
Tweeter Attenuation: Continuously variable
Warranty: One Year
Power Requirements: 120VAC, 225VA 240VAC, 225VA
Fuse: 5A 250V slow blow
Size and Weight BR12: 17.5Wx12Dx25H. 36 lbs. BR15:19.3Wx14.9Dx24H. 46 lbs.
Footswitch: FS22, mute and EQ

FRONT & REAR PANEL CONTROLS

1. INPUT JACK
   The 1/4″ phone jack is an instrument input designed to handle both active and passive basses in connection with the Active Switch.

2. BLUE JEWEL LIGHT
   The Blue jewel light indicates the power is on.

3. DRIVE CONTROL
   The DRIVE control adjusts the input level to the class A preamps. The Drive control serves two purposes. The first half of the knob, 0-5, can be used to adjust the input sensitivity for the differences in bass pickups. The second half of the knob, 5-10, will increase the harmonic content of the tone. The closer to 10 the more overdrive the tone will become. The drive knob will increase the volume of the amplifier, so use it in combination with the master volume to achieve the desired amplifier volume.

4. MUTE SWITCH
   The MUTE switch mutes the output of the amplifier. A blue LED indicates the MUTE switch is on. The mute switch is ideal for changing basses while the amp is on and silent tuning on stage, since the rear tuner output is not muted. The mute feature can also be switched with an FS22 footswitch.

5. ACTIVE SWITCH
   Flip the active switch to the down “OFF” position for standard passive bass pickups. If your bass uses a battery with an onboard active preamp, put the switch in the up position. A blue LED indicates the ACTIVE switch is on.

6. CONTOUR CONTROL
   The contour control provides a variable mid range scoop. When this control is set to “FLAT” there is no change to the mid range frequencies. As you turn the contour control clockwise, a mid range cut is scooped at 250Hz. When the contour control is set to maximum, the mid-range is cut at -9dB at 300Hz.

7. BASS AND TREBLE TONE CONTROLS
   The BASS and TREBLE tone controls are custom shaped controls to deliver punchy lows and crisp tight highs for a variety of bass sounds. When the BASS control is turned to the right, it boosts the signal and when turned to the left cuts the signal. The effected frequencies are centered at 80Hz and can deliver a great deal of volume. Be careful not to distort the output. When the TREBLE control is turned to the right, it boosts the signal and when turned to the left, it cuts the signal. The boosted frequency for the TREBLE control is centered at 8k Hz.

8. MID SWEEP TONE CONTROLS (GAIN & FREQ.)
   These two controls will take some time to learn how to use. First, the FREQ. control does not function if the GAIN control is set in the center “0” position. To demonstrate, turn the GAIN to the right for full boost. Now turn the FREQ. control from full left to full right and notice the added mids change frequencies as you play your bass. Now turn the GAIN to the full left and re-sweep the FREQ. control and notice the mids disappear at different frequencies. There are many variables as you can hear, so write down some of the settings for future reference. The mid sweep system is designed for fine tuning your overall sound.

9. COMPRESSOR (COMP)
   For some people, a compressor is a new feature. What it basically does is reduce (or compress) the volume of the incoming signal to conform to a preset maximum output level. This describes the COMP knob in the full-clock wise position where it functions as a limiter. As the knob is turned back (counter clockwise) the compressor lets a larger and larger percentage of the incoming signals to pass through. This is raising the threshold of where the compressorturns on. The maximum compression ratio is 3:1. The advantages of a compressor is to increase the overall level of playing (or the average level) and not have peaks or other sudden loud parts (transients). For example, in slap bass playing, the plucked notes can put out peaks that could distort the amplifier at normal playing volumes. On the other hand, if the amplifiers volume was adjusted for these peaks, the rest of the notes would be too quiet to hear. Now, when the compressor is adjusted to where the indicator LED comes on when the peaks are present, the amplifier can be played louder and still reduce the peaks without distortion. It’s like having someone constantly and instantly re-adjusting the volume of the amplifier to prevent distortion when the peaks occur. The Compressor circuit is also internally connected to the power amplifier. When the amplifier reaches a distortion level that maybe harmful to speakers it activates the compressor to reduce the input signal. This in turn takes the amplifier out of distortion and protects the speakers even when the compressor control is set to “0”.

10. 5-BAND POST SHAPE EQUALIZER AND EQ IN SWITCH
    5 band’s of the GRAPHIC EQ have been custom shaped and selected for the bass guitar. The levels and tonal shaping of each band are customized individually unlike a standard graphic EQ to increase its usefulness and sweeten the sound of each band. Here are some references for the individual sliders to help relate the frequencies in hertz to perceived sounds.

    • The 80Hz slider is for the ultra lows. Often used in the cut region to boost or reduce the low end.
    1. The 250 Hz slider is for the mid-low bass. The bass has a great deal of sound here, so this slider can change the sound drastically. Slide it up and down to hear what you like.
    • The 500Hz slider is for the mid-bass frequencies. Like the 250Hz slider, there is a great deal of bass guitar here also.
    • The 800Hz slider is for the bass guitar’s high mids. This is where the mids start to get snappy, but they can also get honky.
    • The 2KHz slider is for the bass guitar’s highs. The crispy high’s in slap bass playing start in the range of this slider.
      ADJUSTING THE GRAPHIC EQ SLIDERS: The best way to use the GRAPHIC EQ is to set all the sliders to their center detent positions. When the sliders are in this position, they do no affect the audio signal. After playing in this “flat” setting for a few minutes, raise one slider (to boost) and play a broad range of notes to hear the change. Then lower the same slider pass the center detent (to cut), play a few notes to hear the change and return the slider to the center position. Try this with each slider to hear what they do, then go back and adjust them together if needed for your sound. EQ IN switch: when the blue LED is lit the Graphic EQ is in and will effect the sound of the amplifier. The Graphic EQ can also be switched in and out with an FS22 footswitch.

11. MASTER VOLUME
    The master is the last volume control of the amplifier. This is where overall level of the amplifier is set. The master volume also effects the headphone output.

12. DI LEVEL & DI XLR OUTPUT
    The BR series provides this professional feature only found on our larger bass amplifiers. The direct output is used to send a direct signal to the main PA system or a recording track. The signal is a buffered and balance version of the signal straight from the input jack. Use the DI level control to adjust the output level of the direct output, and use the Ground lift switch to break a ground loop buzz caused by creating power ground loops through making the direct output connection to the PA system.

13. POWER SWITCH
    The power switch turns on the amplifier and is indicated by the large blue jewel light over the input jack.

14. HEADPHONE/LINE OUT JACK
    The 1/4” jack can be used for mono headphone or a line output to feed a mixer or power amp.

15. SEND JACK (EFFECTS LOOP)
    The SEND jack is the output of the preamp. This jack, used in conjunction with the RETURN jack, makes up the external effects loop. The SEND jack is designed to put out the proper level for the input of an external effects processor.

16. RETURN JACK (EFFECTS LOOP) The RETURN
    jack completes the effects loop in conjunction with the SEND jack. This jack is designed to receive signals from an external effects processor. When something is plugged into this jack it goes directly into the power amp portion of the bass amplifier and breaks the connection between the bass preamp and the internal power amp.

17. SPEAKER OUTPUT JACK(S)
    There are 2 speaker output jacks designed for a total minimum impedance of 4 ohms.

18. AC POWER
    The detachable AC POWER CORD supplied is designed to operate with one type of voltage (the European 230V export model uses a CEE-7 plug cord set). Check the rear power cord label for the proper voltage. Plug the cord into a grounded “3” prong” power source. No attempt should ever be made to defeat or use the amp without the ground connected.

19. HF DRIVER LEVEL CONTROL (ENCLOSURE)
    In the back of the BR12 and BR15 there is a small jack plate with a level knob for the HF Driver. This level control adjusts the volume of the HF Driver and does not effect the 15” woofer. The HF Driver level control is another way to increase or decrease the highs coming from your bass. If more highs are desired, the HF Driver level can be turned up (clock wise), or turned off if a warmer sound is desired. Note: One thing to consider with the HF Driver volume is the direction the cabinet is facing. Because the combo amplifier’s HF Driver is less than two feet off the ground, the listeners seated in front of the amplifier may be getting more of the HF Driver volume than you (the player) standing in front of the amplifier. So be conscious of the volume and direction of the HF Driver when adjusting.

This symbol is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

This symbol is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance

IMPORTANT! FOR YOUR PROTECTION, PLEASE READ THE FOLLOWING:
WATER AND MOISTURE : Appliance should not be used near water (near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool, etc). Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings.
POWER SOURCES: The appliance should be connected to a power supply only of the type described in the operating instructions or as marked on the appliance.
GROUNDING OR POLARIZATION: Precautions should be taken so that the grounding or polarization means of an appliance is not defeated.
POWER CORD PROTECTION: Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the appliance.
SERVICING: The user should not attempt to service the appliance beyond that described in the operating instructions. All other servicing should be referred to qualified service personnel.
FUSING: If your unit is equipped with a fuse receptacle, replace only with the same type fuse. Refer to replacement text on the unit for correct fuse type.

SAFETY INSTRUCTIONS (EUROPEAN)
The conductors in the AC power cord are colored in accordance with the following code. GREEN & YELLOW—Earth BLUE—Neutral BROWN—Live U.K. MAIN PLUG WARNING: A molded main plug that has been cut off from the cord is unsafe. NEVER UNDER ANY CIRCUMSTANCES SHOULD YOU INSERT A DAMAGED OR CUT MAIN PLUG INTO A POWER SOCKET.

LIMITED WARRANTY

Your Carvin product is guaranteed against failure for ONE YEAR unless otherwise stated. Carvin will service and supply all parts at no charge to the customer providing the unit is under warranty. Shipping costs are the responsibility of the customer. CARVIN DOES NOT PAY FOR PARTS OR SERVICING OTHER THAN OUR OWN. A COPY OF THE ORIGINAL INVOICE IS REQUIRED TO VERIFY YOUR WARRANTY. Carvin assumes no responsibility for horn drivers or speakers damaged by this unit. This warranty does not cover, and no liability is assumed, for damage due to: natural disasters, accidents, abuse, loss of parts, lack of reasonable care, incorrect use, or failure to follow instructions. This warranty is in lieu of all other warranties, expressed or implied. No representative or person is authorized to represent or assume for Carvin any liability in connection with the sale or servicing of Carvin products. CARVIN SHALL NOT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. When RETURNING merchandise to the factory, you may call for a return authorization number. Describe in writing each problem. If your unit is out of warranty, you will be charged the current FLAT RATE for parts and labor to bring your unit up to factory specifications.

HELP SECTION

1. MP WILL NOT TURN ON
   Check the power to the amp. Check for tripped circuit breakers, unplugged extension cords or powerstrip switches that may be turned off. Check the fuse. If a dark brownish color or no wire can be seen within the glass tube, then replace. The amp may be perfectly fine but occasionally a fuse may blow because of high AC voltage surges. After the fuse has been replaced with the proper Slow Blow value and if the fuse fails again, the amp will require servicing.

2. NO OUTPUT with POWER LED
   light ON Check the speaker cable. If OK, it’s possible that a speaker jack is defective. Check the SEND & RETURN jacks as one of these jacks could be defective. Insert a guitar cord between these two jacks to test. Defective jacks will require servicing.

3. EEP YOUR AMP LOOKING NEW
   Use a damp cloth to wipe the controls on the front & rear chassis panels. Wipe dry! Brush the lint off the Duratuff II™ covering.

CAUTION
RISK OF ELECTRIC SHOCK

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL! THIS UNIT CONTAINS HIGH VOLTAGE INSIDE!

References

• Carvin Audio Great Sounding Gear For Musicians and Sound Professionals
• Carvin Audio Great Sounding Gear For Musicians and Sound Professionals
• Manual-Hub.com – Free PDF manuals!

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