Transcript
CA-1P/1PD ACOUSTIC PREAMPLIFIER
OWNER’S GUIDE
About the CA-1P/1PD:
D
esigned for the performing artist as well as the studio musician, Crate’s CA-1P/1PD Acoustic Preamplifier gives you more of what you want: microphone-quality sound, without feedback. And without being “chained” to a mic stand! The CA-1P/1PD features two independent channels, each with its own gain, eq and reverb/ effects controls, contained in an easily interpreted single rack space package. Channel one features an “Active / Piezo” switch to properly match the pickups of your instrument, a “Shape” control for a richer sound and a 3-band rotary EQ. An easy-to-use feedback elimination circuit with frequency select and cut controls lets you kill feedback without sacrificing sound quality. Plus a foot-switchable chorus with depth and rate controls. Channel Two offers both low and high impedance inputs and allows the use of a rhythm machine, background tape, a high or low-Z mic, or another instrument.
On the rear panel, a footswitch jack is provided for the reverb and chorus. Level-controllable XLR and 1/4” balanced line outputs allow you to patch into house sound boards or recording consoles, plus an effects loop line-in/line-out setup allows connection of external effects. In addition, there’s a stereo Headphone jack, direct Channel Output jacks, and a Stereo Input jack. Our optional On-Board Digital Sound Processing (DSP) offers a variety of digital reverbs, effects and delays specifically designed for acoustic instruments, and available on Crate’s CA-1P/PD.
The CA-1P/1PD was designed by musicians and music-loving engineers. Highly sophisticated computer-driven assembly machines and highly skilled assemblers use only the finest components to produce each preamp. The final assembled product is tested – and played – by skilled musician/technicians. It is only after the preamp has passed this barrage of testing by very particular people that it gets packed up and shipped out. The CA-1P/1PD Acoustic Preamplifier. Designed to be its best, so you can sound your best!
Crate products are Made With Pride in the U.S.A. To get this preamp to sound its best, read this owner’s guide prior to its use. To keep this preamp looking its best, avoid abrasive cleansers. Wipe the unit clean using a slightly dampened cloth.
The DSP Section (CA-1PD only): Crate’s On-Board Digital Sound Processing (DSP) offers a wide range of different digital reverbs, effects and delays designed specifically for use with acoustic instruments and vocals. Select the type of effect desired by rotating the Rev Mode control (#23). This control is divided into five sections: Small Area Reverbs (SAR), Large Area Reverbs (LAR), Special Reverbs (SPR), Delays (DLY) and Multiple Effects (MULTI). DLY
SPR LAR SAR
CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
MULTI
The following chart provides a list of the DSP settings along with a brief description of each effect. Small Room 8’ x 8’ empty room w/hardwood floor
SAR:
Small Rehearsal Hall 20’ x 40’ hall, wood floors, hard walls ATTENTION
VORSICHT
RISQUE D'ELECTROCUTION NE PAS OUVRIR
ELEKTRISCHE SCHLAGGEFAHR NICHT OFFENEN
ATTENTION: POUR REDUIRE D'ELECTROCUTION NE PAS ENLEVER LE COUVERCLE. AUCUNE PIECE INTERNE N'EST REPRABLE PAR L'UTILISATEUR. POUR TOUTE REPARATION, S'ADRESSER A UN TECHNICIEN QUALIFIE. VORSICHT: ZUR MINIMIERUNG ELEKTRISCHER SCHLAGGEFAHR NICHT DEN DECKEL ABENHMEN. INTERNE TEILE KONNEN NICHT VOM BENUTZER GEWARTET WERDEN. DIE WARTUNG IS QUALIFIZIERTEM WARTUNGSPERSONAL ZU UBERLASSEN.
Large Hall 50’ x 100’ hall, about 50 persons
LAR:
Concert Hall 5000-seat hall, full crowd Gated Reverb Reverb tail “cut off”
SPR:
Reverb/Predelay Reverb with a 130ms predelay DLY: Slapback, short 125ms delay + reverb Slapback, Med-short 240ms delay + reverb Slapback, Medium 350ms delay + reverb
THIS EQUIPMENT HAS BEEN DESIGNED AND ENGINEERED TO PROVIDE SAFE AND RELIABLE OPERATION. IN ORDER TO PROLONG THE LIFE OF THE UNIT AND PREVENT ACCIDENTAL DAMAGES OR INJURY, PLEASE FOLLOW THESE PRECAUTIONARY GUIDELINES: CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT OPEN CHASSIS; DO NOT DEFEAT OR REMOVE THE GROUND PIN OF THE POWER CORD; CONNECT ONLY TO A PROPERLY GROUNDED AC POWER OUTLET. WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. CAUTION: NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. CAUTION: OUR AMPLIFIERS ARE CAPABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS. CONTINUED EXPOSURE TO HIGH SOUND PRESSURE LEVELS CAN CAUSE PERMANENT HEARING IMPAIRMENT OR LOSS. USER CAUTION IS ADVISED AND EAR PROTECTION IS RECOMMENDED IF UNIT IS OPERATED AT HIGH VOLUME.
EXPLANATION OF GRAPHICAL SYMBOLS:
"DANGEROUS VOLTAGE"
= “VOLTAJE PELIGROSO”
"DANGER HAUTE TENSION" "GEFAHLICHE SPANNUNG"
"IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL"
= “ES NECESARIO QUE EL USUARIO SE REFIERA AL MANUAL DE INSTRUCCIONES.” "REFERREZ-VOUS AU MANUAL D'UTILISATION" "UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGEN"
Slapback, Long 530ms delay - 600’ travel time MULTI:
Chor-Delay 400ms delay w/modulation Chorus Modulation Flange Short chorus Delay 1 125ms delay + reverb w/20% regen
Delay 2 125ms delay + reverb w/25% regen Instrument Doubler Sim. second track slightly out-of-sync
On the Front Panel: CA-1: INPUT
ACTIVE
GAIN
LOW
MID
0
0
CHANNEL ONE HIGH
FREQ
CUT
0
500Hz
-15dB
175 Hz
PIEZO
SHAPE
0
10
PEAK -15
+15
-15
1 2 3 4 5 6
+15
-15
7
+15
DEPTH
RATE
LOW-Z
HI-Z
CHANNEL TWO PHANTOM
GAIN
LOW
HIGH
0
0
EFFECTS SEND
MASTER LEVEL
1. 2k Hz
80Hz
8
CHORUS
EFFECTS SEND
CA-1P 0
4kHz
9
-30dB
10
0
10
CHORUS
0
10
11 12 13
0
CHORUS
10
14
15
0
10
16 1718 19
-15
+15
20
-15
+15
0
10
21
22
LOW
HIGH
0
0
REV/EFF SEND
ACOUSTIC GUITAR PREAMP
23
24
0
10
25
CA-1P: INPUT
ACTIVE
GAIN
LOW
MID
0
0
CHANNEL ONE HIGH
FREQ
CUT
0
500Hz
-15dB
175 Hz
PIEZO
CHORUS
REV/EFF SEND
DEPTH
RATE
LOW-Z
HI-Z
CHANNEL TWO PHANTOM
GAIN
1. 2k Hz
REVERB
0
10
PEAK -15
+15
-15
+15
-15
+15
80Hz
4kHz
DLY
MASTER LEVEL
LAR SAR
SHAPE
RETURN
MODE SPR
0
-30dB
0
10
CHORUS
0
10
0
CHORUS
10
0
10
-15
+15
-15
+15
0
MULTI
10
0
10
0
10
CA-1P ACOUSTIC GUITAR PREAMP
Channel One: 1: Input. Plug a patch cord from your instrument’s output jack here. 2: Active/Piezo switch. Set this switch to match the type of pickup device on your instrument: for active electronic pickups, set the switch to “active” (out). For passive/magnetic pickups, set it to “piezo” (in). 3. Shape. This switch serves as a mid-cut control when pressed in, adding fullness to the sound of your instrument. 4: Gain. Set this control near its center position for starters, then adjust to suit your playing style and instrument’s output level. For the best signal-to-noise ratio, the nearby Peak LED (#5) should flash occasionally when you play. 5: Peak LED. This indicator LED will light when the input signal is near the limits of the amp’s input stages. Adjust the Gain control (#4) so this LED flashes occasionally. 6: Low. Adjust this control to get the best sounding bass response for your instrument. Excessive boost of the low control can cause an unnatural howling and should be avoided. 7: Mid. Adjust this control to get the best projection and midrange tones for your instrument. 8: High. Adjust this control so your high notes and harmonic overtones are lively but not overpowering. 9: Freq. Used in conjunction with the Cut control (#10), this control allows you to eliminate feedback at the most offending frequency. For proper use, read the section entitled “To Eliminate Feedback” to the immediate right. 10: Cut. Use this control along with the Freq control (#9) to eliminate feedback, as described in the section entitled “To Eliminate Feedback” to the immediate right. 11: Effects Send (CA-1P) / Rev/Eff Send (CA-1PD). Adjust the level of the signal sent to an external effect (if the rear-panel effects loop is used) or the amount of internal DSP reverb (CA-1PD) for Channel One with this control. 12: Chorus On/Off switch. Activate the internal chorus by pushing this switch into its locked-in position; press the switch again (switch out) to turn the chorus off. This switch is bypassed when a footswitch is used (see #36, rear panel). 13: Chorus Depth. Adjust how much chorus effect is applied by rotating this control – the further you turn to the right the greater the intensity of the effect, pitch wavering up and down. 14: Chorus Rate. Adjust the speed of the chorus effect by rotating this control – the further you turn to the right the faster the effect. Channel Two: 15: Low-Z input. Connect a low impedance mic cable here for vocals. 16: Hi-Z input. Connect a high impedance mic cable, a rhythm machine, the output of your backup tape machine or an instrument here. 17. Phantom. Some low impedance mics require power to be applied to their signal pins for proper operation. When using this type of mic, press this switch in. The phantom switch applies 15V to pins
18:
19: 20:
21: 22:
23:
24:
25:
2 and 3 of the low-Z input jack (#15). (Mics not requiring phantom power will not be affected by the phantom power switch.) Chorus On/Off switch. When Channel One’s chorus switch (#12) is pressed in, this switch controls the chorus for Channel Two. (Chorus is only available for this channel when Channel One’s chorus switch is pressed in.) Gain. Adjust the level of the Channel Two input signal with this control for the best mix with Channel One’s signal. Low. Adjust this control to get the best sounding bass response for your instrument. Excessive boost of the low control can cause an unnatural howling and should be avoided. High. Adjust this control so your high notes and harmonic overtones are lively but not overpowering. Effects Send (CA-1P) / Rev/Eff Send (CA-1PD). Adjust the level of the signal sent to an external effect (if the rear-panel effects loop is used) or the amount of internal DSP reverb (CA-1PD) for Channel Two with this control. Reverb Mode (CA-1PD only). Selection of digital effects is made with this control. A listing of the available effects settings is given in the section entitled “The DSP Section.” Reverb Return (CA-1PD only). Adjust the amount of the DSP reverb effect with this control - the further you turn to the right the deeper the effect. Master Level. Set the overall output of the preamp with this control.
To Eliminate Instrument Feedback: One of the most common problems encountered when amplifying acoustic instruments, especially in small environments, is feedback. Acoustic instruments typically have inherent qualities which cause resonant feedback at specific frequencies. Instrument tone controls and sound board eq’s are helpful in getting rid of the problem, but since they operate around relatively wide frequency bands the musician must sacrifice sound quality in his quest to do away with feedback. Since Crate’s feedback elimination circuit isolates the offending frequency, you can now eliminate feedback without affecting your overall sound. Chances are, you may not have a problem with feedback at all. In that case, leave the CA-1P/1PD’s Freq and Cut controls at the fullycounter-clockwise position. However, if you do encounter feedback while playing, set the Cut control to -30dB (fully clockwise) and adjust the Freq control until the feedback is gone. Reduce the Cut to about the 12:00 position and readjust the Freq control as needed. Continue reducing the Cut control and readjusting the Freq control until there is no more feedback with the Cut control as far to the counterclockwise position as possible. This way you’ve effectively eliminated instrument feedback without sacrificing sound quality.
On the Rear Panel:
AVIS: RISQUE DE CHOC ELECTRIQUE. NE PAS OUVRIR.
AC LINE IN
MADE IN THE U.S.A. BY SLM ELECTRONICS 1400 FERGUSON AVE., ST. LOUIS, MO 63133
HEADPHONES/ LINE OUT
POWER
LOW Z
HIGH Z
LEVEL
CHANNEL TWO
CHANNEL ONE
RETURN
SEND
TIP = ONE, RING = TWO TIP = TWO, RING =ONE CHANNEL ASSIGNMENT
REVERB/ CHORUS
CA-1P 2018A
0
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
MASTER
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
26
27
28
29
30
26: Power Switch. Turns the preamp on and off – lights up when the preamp is on. 27: Line In. Connect the female end of the AC line cord here. Connect the male plug to a suitable source of line voltage. Refer to the voltage information on the back of the preamp for its voltage and current requirements. Note: This is a grounded plug. To avoid the possibility of electric shock, DO NOT defeat the ground connection in any way! 28: Headphones/Line Out Master. Use this jack to connect a pair of stereo headphones or to send an high impedance, unbalanced line level stereo signal to a house sound board, a recording console or an external power amplifier by means of an 1/4” stereo plug-terminated cable. The level at this jack is controlled by the Master Level knob (#25, front panel). 29: Low Z Bal. Use this jack to connect a low impedance, balanced line level mono signal to a house sound board, a recording console or an external power amplifier by means of an XLR-terminated cable. (Pin 1 is ground, pin 2 is signal +, and pin 3 is signal -.) The level at this jack is controlled by the Line Out Level knob (#31). 30: High Z Bal. Use this jack to connect a high impedance, balanced line level mono signal to a house sound board, a recording console or an external power amplifier by means of an 1/4” stereo plug-terminated cable. (Ring is signal +, tip is signal -, and sleeve is ground.) The level at this jack is controlled by the Line Out Level knob (#31). 31: Line Out Level. Adjust the level of the line out signal with this control - the further you turn to the right the stronger the signal. (This control works independently from the master level control.) 32: Channel Two output. Use this jack to connect an unbalanced, line level mono “direct out” signal from Channel Two to a house sound board, a recording console or an external power amplifier by means of an 1/4” mono plug-terminated cable. This signal is post-EQ and pre-Master Level.
ACTIVE PIEZO
10
LINE OUTPUT
CHANNEL OUTPUT
31
32
33
EFFECTS LOOP
34
35
FOOT SWITCH
STEREO INPUT
36 37 38 39
33: Channel One output. Use this jack to connect an unbalanced, line level mono “direct out” signal from Channel One to a house sound board, a recording console or an external power amplifier by means of an 1/4” mono plug-terminated cable. This signal is post-EQ and pre-Master Level. 34: Effects Loop Return. Patch into an external effects device using this jack and the Effects Loop Send jack (#35). Connect a shielded cable from the output jack of the external effects unit to this jack. 35: Effects Loop Send. Connect a shielded cable from this jack into the input jack of the effects unit. 36: Footswitch - CA-1P: Connect a one-button footswitch (such as the Crate CFP-1) here for remote on/off control of the chorus. When connected, the footswitch overrides the front panel chorus on/off switch. The footswitch tip controls the chorus; sleeve is ground. CA-1PD: Connect a two-button footswitch (such as the Crate CFP-2) here for remote on/off control of the DSP section and chorus. When connected, the footswitch overrides the front panel chorus on/off switch. The footswitch tip controls the chorus, ring controls the DSP; sleeve is ground. 37: Channel Assignment switch. This switch assigns the tip and ring connection of the Stereo Input jack (#39) as follows: Switch OUT: Tip = Channel One, Ring = Channel Two Switch IN: Tip = Channel Two, Ring = Channel One 38: Active/Piezo switch. Set this switch to match the type of pickup device on your instrument: for active electronic pickups, set the switch to “active” (out). For passive/magnetic pickups, set it to “piezo” (in). 39: Stereo Input jack. For instruments with stereo outputs (such as acoustic guitars with pickups in the bridge and a built-in microphone), connect a stereo 1/4” cable here to send one signal (for example, the bridge pickups) to Channel One and the other to Channel Two. The Channel Assignment switch (#37) determines which channel receives which signal.
CA-1P/1PD Block Diagram: ch. 1 out
channel 1 input active
piezo filter
stereo input
gain
left right line out effects
chorus
tones
rev/ effect send
low mid high shape
piezo
active
freq cut
footswitch
on
chorus
reverb mode effects send
on DSP
depth rate peak
CA-1PD only
effects return
ch. assign
line out phantom power low-z input tones
channel 2 hi-z input
gain
low high
rev/ effect send
ch. 2 out
chorus on
level
reverb return
hi-z bal. low-z bal.
right
master level left
headphones/ line out
CA-1P/1PD Technical Specifications: Channel One: Low: +/-15dB @ 80Hz Mid: +/-15dB @ 650Hz High: +/-15dB @ 10kHz Input Impedance: 25k ohm (Active), 2.2M ohm (Piezo) Input Sensitivity: 22mV RMS (Actv), 9mV RMS (Pzo) Sens. to Eff Send/Line out: 70mV Max Input Signal: 6v RMS (17v peak to peak) Feedback Elimination: Freq: variable from 80Hz to 4kHz Cut: variable from -0 to -30dB Channel Two: Low: +/-15dB @ 80Hz High: +/-15dB @ 10kHz Input Impedance: 3k ohm (Lo-Z), 20k ohm (Hi-Z) Input Sensitivity: 3mV RMS (LZ), 15mV RMS (HZ) Sens. to Eff Send/Line out: 9mV (LZ), 50mV (HZ) Max Input Signal: 10v RMS (28v peak to peak) Effects Loop: Line Out 1v RMS, Line In 1v RMS Stereo Input: Input Impedance: 20k ohm to Ch. 2 25k ohm Active to Ch. 1 2.2M ohm Piezo to Ch. 1 Input Sensitivity: 15mV to Ch. 2 22mV Active to Ch. 1 9mV Piezo to Ch. 1 Eff Return to Line Out Sens: 50mV Eff Return In. Impedance: 11k ohm Eff Send Out. Impedance: 2.2k ohm Line Out Out.Impedance: 220 ohm (Lo-Z), 2.2k ohm (Hi-Z) Ch. 1 Out. Impedance: 10k ohm Ch. 2 Out. Impedance: 10k ohm Power Requirements: 120VAC, 60Hz, 14VA; 100/110VAC, 50/60Hz, 14VA; 230VAC, 50/60Hz, 14VA Size and Weight: 1-3/4”H x 19”W x 7-5/8”D, 9 lbs. Crate continually develops new products, as well as improves existing ones. For this reason, the specifications and information in this manual are subject to change without notice.
©1997 SLM Electronics • A Division of St. Louis Music Co. 1400 Ferguson Avenue • St. Louis, MO 63133
P/N 47-434-02 05/97
