Owner’s Manual
Greetings from the Home of Tone® …You, smart player and intuitive human, have put your trust in us to be your amplifier company. This is something that we do not take lightly. By choosing this instrument to be part of your musical voice, you have become part of the MESA® family… WELCOME! Our goal is to never let you down.
Table of Contents PRECAUTIONS OVERVIEW_____________________________________________________________________________________ 1-2 INSTANT GRATIFICATION & HELPFUL HINTS_________________________________________________________ 2 FRONT PANEL INSTRUMENT INPUT______________________________________________________________________________ 3 MUTE SWITCH___________________________________________________________________________________ 3 ACTIVE/PASSIVE SWITCH___________________________________________________________
IMPORTANT SAFETY INSTRUCTIONS Read these instructions. Keep these instructions. Heed all warnings. Follow all instructions. Do not use this apparatus near water. Clean only with dry cloth. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. Do not defeat the safety purpose of the polarized or grounding-type plug.
Operating Instructions Overview: Congratulations on your choice of the SUBWAY® D-800™ and welcome to the MESA/Boogie® family! First, we would like to thank you for choosing us as your amplifier company and trusting us to help create your musical voice. This is something we never take for granted and you’ll find that we are here and ready to assist you should you ever need help.
Overview: Front Panel The SUBWAY® D-800™ begins with the front panel input section, which is comprised of the INPUT jack, MUTE switch and ACTIVE/ PASSIVE switch. The INPUT jack feeds a high impedance monolithic J-FET input amplifier which provides appropriate loading to the pickup, and isolates the switching circuitry from the high impedance signal path.
FRONT PANEL (CONTROLS & FEATURES) POWER PROTECT LIMIT INPUT O/D INPUT MUTE ACTIVE ON PLAY PASSIVE DEEP VOICING FLAT BASS LOW MID HIGH MID TREBLE MASTER BOOST ™ INPUT JACK This jack is the instrument INPUT that feeds the first stage monolithic J-FET buffer amp of the SUBWAY D-800. The input sensitivity of this input buffer amp is adjustable with the ACTIVE/PASSIVE switch, the ACTIVE position being about 10dB less sensitive (lower gain) than the PASSIVE position.
VOICING CONTROL This active EQ control modifies the amplifier’s response from a more flat like curve (in the counterclockwise position) to a more vintage curve (in the clockwise position) by modifying and shifting the frequency response in all regions with a simple turn of the knob. As the control is rotated clockwise, the low end increases and the high end increases while the midrange decreases and shifts upward.
LIMIT LED This amber LED indicates that the power amp is nearing maximum power and is entering the soft clip/limit output tube emulation mode. Soft clip/limit output tube emulation mode mimics many of the desirable characteristics of tube amp output stage overdrive while eliminating the common solid state clipping artifacts. There is approximately 6dB of range on this circuit, driving beyond this, of course, will cause gradual output stage clipping.
8 ohm cabinets. Note that measuring speaker cabinets using an ohm meter will not give accurate results because ohm meters read DC resistance not AC impedance. AC impedance will always be greater than the DC resistance, a typical 8 ohm speaker will usually measure between 5 and 7 ohms, a typical 4 ohm speaker will usually measure between 2.5 and 3.5 ohms.
“really” ground, so additional techniques are incorporated within this network that allows 2 functional grounding spectrums within the same network, providing added RFI (radio frequency interference) rejection. The general rule is to start with pin 1 lifted, and if there is noise, try connecting it. It should also be noted that there are a lot of other possible causes for noise, this switch is often (read sometimes) a solution for ground loop noise between the PA and the bass amp.
TROUBLESHOOTING In the event that your amplifier appears not to work correctly, often enough the problem is not with the amp, but a related piece of equipment that it’s necessary to take a deliberate, systematic approach to troubleshooting in order to effectively identify and correct the problem. Yes, believe it or not, we have seen all of these things many times.
SYMPTOM NOISE (LOW FREQUENCY HUM) IN AUDIO 1. Defective instrument cable or problem with bass wiring (unplug instrument cable from amplifier, if hum goes away, this means that the noise is entering from outside the amplifier. Try known good instrument cable and/or bass) 2. Power source wiring is not grounded/earthed (check all wiring for missing grounding/earthing pins, have qualified electrician check building power wiring for missing ground/earth connections and correct as necessary.) 3.
FACTORY SAMPLE SETTINGS CLASSIC SLAP POWER PROTECT LIMIT INPUT O/D INPUT MUTE ACTIVE ON PLAY PASSIVE DEEP VOICING FLAT BASS LOW MID HIGH MID TREBLE MASTER BOOST ™ ROCK AUTHORITY POWER PROTECT LIMIT INPUT O/D INPUT MUTE ACTIVE ON PLAY PASSIVE DEEP VOICING FLAT BASS LOW MID HIGH MID TREBLE MASTER BOOST ™ J BASS FUNK POWER PROTECT LIMIT INPUT O/D INPUT MUTE ACTIVE ON PLAY PASSIVE DEEP VOICING FLAT BASS LOW MID HIGH MID TREBLE MASTER BOOST ™ FRETLESS POWER PROT
Specifications Output Power Rating: 400 watts rms @ 8 ohms, 10% THD (includes preamp O/D THD) [note 1] 800 watts rms @ 4 ohms, 10% THD (includes preamp O/D THD) [note 1] 800 watts rms @ 2 ohms, 10% THD (includes preamp O/D THD) [note 1, 4] Signal to Noise Ratio: -74dB (20-20kHz, unweighted) Maximum Available Gain: 79dB, (EQ controls flat, passive mode) Equalization: Bass: +14dB/-14dB @ 40Hz [note 2] Low Mid: +14dB/-14dB @ 200Hz High Mid: +14dB/-14dB @ 480Hz Tr
15/09/08
