HA2500 HA2500 2 250 WATT BASS AMPLIFIERS Hartke
Safety Instructions/Consignes de sécurité/Sicherheitsvorkehrungen/Instrucciones de seguridad WARNING: To reduce the risk of fire or electric shock, do not expose this unit to rain or moisture. To reduce the hazard of electrical shock, do not remove cover or back. No user serviceable parts inside. Please refer all servicing to qualified personnel.
Table of Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Guided Tour . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction Congratulations on purchasing the Hartke Model 2500 Bass Amplifier! Although this unit is designed for easy operation, we suggest you first take some time to go through these pages so you can fully understand how we’ve implemented a number of unique features. The Model 2500 provides 250 watts of power to a 4 ohm speaker system or 180 watts to an 8 ohm speaker system. With that kind of power, the Model 2500 is EXTREMELY loud and punchy.
Features The Hartke Model 2500 bass amplifier offers all the newest concepts in bass amplification. Here are some of its main features: • Power to spare — The Model 2500, a full 250 watts delivered to a 4 ohm speaker system or 180 watts to an 8 ohm speaker system. • Our unique Transient Attack® circuitry which ensures that every nuance of your bass performance is reproduced faithfully. • Two Pre-Amp input knobs, allowing custom blending of solid state and tube type sounds.
Guided Tour - Model 2500 Front Panel 1 � 4 � � � � � �� �� HA2500 2 �� � 1. Passive Input jack - If your bass guitar has passive circuitry, connect it to the Model 2500 here. This standard, 1/4” unbalanced jack provides a high impedance (100 k Ohms) input sensitivity of 20 millivolts. 2. Active Input jack - If your bass guitar has active circuitry,* connect it to the Model 2500 here. This standard, 1/4” unbalanced jack provides a high impedance (100 k Ohms) input sensitivity of 60 millivolts.
Guided Tour - Model 2500 Front Panel 5. Compression control - This determines the amount of compression (peak signal reduction) by simultaneously adjusting both threshold and compression ratio (which ranges from 2:1 to infinity [limiting]). At the fully counterclockwise “Off” position, the circuitry is bypassed and no compression is applied (the knob clicks when set to the “Off” position). As the knob is raised clockwise (at settings from “1” to “∞”) increasing amounts of compression are applied.
Guided Tour - Model 2500 Rear Panel 1 3 5 4 6 2 1. Fuse sled - This contains a fuse holder and shows the currently selected voltage rating for your Model 2500. Make sure the voltage rating is correctly set before powering up the amplifier! Fuse ratings are 10 amp for 115 vac and 6.2 amp for 230 vac. For information on how to change the voltage rating, see Appendix B on page 14. 2. AC input - Connect the supplied standard 3-pin “IEC” plug here. 3.
Guided Tour - 2500 Rear Panel 5. Effect Send jack - Use this 1/4” unbalanced jack to send low impedance (100 ohm) signal from the Model 2500 to a professional outboard effects processor such as a reverb, echo, chorus, flanger, or harmonizer device.* Output level is approximately 0 dB to +4 dB and is post-EQ and post-compression but unaffected by the setting of the Master Volume control.
Setting Up and Using the Model 2500 Setting up your Hartke Systems 5500 Bass Amplifier is a simple procedure which takes only a few minutes: 1. Remove all packing materials (save them in case of need for future service) and decide where the amplifier is to be physically placed. To avoid potential overheating problems, be sure that the rear panel is unobstructed and that there is good ventilation around the entire unit, particularly behind the rear-panel fan. 2.
Setting Up and Using The Model 2500 7. Experiment with altering the balance of the two Pre-Amp knobs, listening to the effect each has on the overall sound. Depending upon the specific instrument you are using and your personal taste, you may prefer the sound of one over the other, or you may prefer a particular blend of the two. Note that, when both are used at equal settings, the amplifier will be twice as loud as when only one is used.
About Equalization The Hartke Systems Model 2500 Bass Amplifier gives you enormous control over shaping the sound of your bass, using a process called equalization. To understand how this works, it’s important to know that every naturally occurring sound consists of a broad range of pitches, or frequencies, combined together in a unique way. This blend is what gives every sound its distinctive tonal color.
About Equalization To find out how each graphic equalizer slider affects the sound of your particular bass, start with all ten bands flat (that is, all ten sliders at their detented “0” center position). Then, one by one, raise and lower each slider, listening carefully to the effect of each. If you don’t specifically need to utilize the ten-band graphic equalizer, bypass it by setting the In/Out switch to its “Out” position.
About Compression The dynamic range of a sound is the difference between its loudest and softest points. For example, as you play your bass, you’ll probably find that some notes (for example, notes played on the upper frets of the lowest string) are considerably louder than others.
Specifications Input Sensitivity Passive Input Active Input 100 k Ohms, 20 mv. 100 k Ohms, 60 mv. Rated Output Power 250 watts @ 4 ohms 180 watts @ 8 ohms less than .5% Total Harmonic Distortion Signal To Noise Ratio approx.
Appendix A: Sound Set-up Templates Below you will find blank 2500 set-up templates that you can use to write down your favorite settings. Feel free to photocopy these pages if needed.
Appendix B: Block Diagram Model 2500 15
Appendix C: Changing the Model 2500 Voltage 16
Hartke 45 Gilpin Avenue Hauppauge, New York 11788-8816 Phone: 1-800-3-SAMSON (1-800-372-6766) Fax: 631-784-2201 www.hartke.
