SWR Soundメーカー750xの使用説明書/サービス説明書
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750x OWNER’S MANUAL SWR • CORONA, CA • USA.
IMPORT ANT SAFETY INSTRUCTIONS CAUTION: TO REDUCE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE COVER OR BACK. NO USER-SERVICE- ABLE P ARTS INSIDE. PLEASE REFER TO A QUALIFIED SERVICE TECHNICIAN. A. Read Instructions: All safety and operation instr uctions should be read befor e the product is operated.
INTRODUCTION Congratulations on your pur chase of the SWR 750x Bass Amplifier! Y ou now own a killer combination of massive power , easy-to-use contr ols, simply integrated onboar d ef fects… and pur e SWR tone.
750x – FRONT P ANEL FEA TURES • Dual independent input jacks compatible with both passive and active instr uments • Preamp Gain contr ol w ith r ed LED clip indicator • Aural Enhancer contr ol.
Frequency Response (power amplifier) (@ 850 watts RMS) –3dB @ 20 Hz and 40 kHz Sensitivity (full output under clipping, 8 ohms load, 100 Hz) Passive Input Jack: 62 millivolts Active Input Jack: 267 .
Impor tant: The minimum total impedance when operating the 750x is 2.6 ohms. This means you can safely use: a) A single 8 ohm cabinet b) A single 4 ohm cabinet c ) T wo 8 ohm cabinets (total: 4 ohms) d) One 8 ohm cabinet and one 4 ohm cabinet (total: 2.
when tr ying this, make sur e the Preamp Clip LED is not activated. If this occurs, tur n down your Gain control until the LED does not light. The first pr eamp tube stage is NOT monitored by the pr e- amp clip circuit for this r eason.
This r emains tr ue up to about the “2 o’clock” position. This position—a favorite for many users—brings out both the low end fundamentals and crisp highs and, at the same time, adds a little lower midrange to help cu t th r ough the band.
tion with the level of the clean “Channel One.” How do you contr ol the level of “Channel One?” By using the Gain Contr ol, which contr ols the level of the clean bass signal in the pr eamp. Also, the EQ Contr ol s ar e located after the Over drive cir cuitr y , s o they can have a drastic ef fect on t he distor ted tone.
8 • 750x OWNER’S MANUAL Pull Turbo Pulling the Bass Contr ol knob to the “out” position widens the bandwidth of the bass contr ol, and changes the center-point fr equency fr om 8 0 H z to 40 Hz. It has the ef fect of more clearly enunciating fr equencies down to 30 cycles (low “B” on a five string bass).
750x OWNER’S MANUAL • 9 The Ef fects Blend cir cuit is similar to that used on r ecording consoles with the ef fec ts l oop on a “side chain” to the nor mal circuit. Unless the contr ol is set to the full “wet” position, you will always get the full sound of your instr ument AND get the diversity an ef fects unit of fers.
Power On/Of f Switch Th is sw it ch tu r ns the complete unit on or of f. Setting the switch upwar ds to the “On” position tur n s o n t he unit, and the switch itself will illuminate in r ed.
W iring for the XLR jack at the Balanced Output is as follows: Pin 1 = gr ound, Pin 2 = + (plus), Pin 3 = – (minus) (American Standar d ) Note: T ur n of f transients appear at the Balanced Output when the amplifier is shut down.
The Ef fects Loop is compatible with most individual or multi-ef fect exter n a l e f fects devices. Many ef fects devices on the market have input level adjustments. For instance, some units have a switch that you can set for either –20 dB or +4 dB.
Preamp Out This jack provides another audio output, but it is located later in the signal chain than the Ef fects Send jack. This signal is post-EQ AND post-ef fects loop, but still befor e ( pre) the Master V olume contr ol. Y o u should use this jack when using an ef fects device in the ef fects loop and wish to achieve: 1.
Unlike power amps, ever y speaker cabinet has a pr e-deter mined impedance rating measure d in “ohms.” In most cases this rating is either 4 or 8 ohms (though ther e may still be some old 2 ohm cr eakers out ther e) . The higher the impedance of the speaker cabinet, the mor e r esistance to power it will of fer.
750x Power Deliver y Capabilities (Power Ratings) Aft er det er mining how the number of cabinets you wish to r un a f fects the total operating impedance, you need to take into account the power handling capabilities of your speaker cabinets as compar ed to what the 750x can deliver at that impedance.
Recommended single SWR Speaker enclosur es for use with the 750x include: • Megoliath 8x10 • Goliath Senior 6x10 • Big Ber tha 2x15 • Henr y The 8x8 • 12-Stack 4x12 • Workingman’s T ower.
RACK MOUNTING INSTRUCTIONS T o preser ve the beauty and r eliability of your amplifier, we r ecommend that you install your amplifier in a rack case. The 750x is completely r eady to be rack mounted and needs no additional par ts or accessories other than the rack scr ews and the case itself.
750x LIMITED W ARRANTY The 750x fr om SWR is war ranted to the original consumer pur chaser for TWO YEARS fr om the date of pur chase against defects in materials and workmanship, pr ovided that it is pur chased fr om a n Authorized SWR dealer . This war ranty applies only to products pur chased in the USA or Canada.
デバイスSWR Sound 750xの購入後に（又は購入する前であっても）重要なポイントは、説明書をよく読むことです。その単純な理由はいくつかあります：
SWR Sound 750xをまだ購入していないなら、この製品の基本情報を理解する良い機会です。まずは上にある説明書の最初のページをご覧ください。そこにはSWR Sound 750xの技術情報の概要が記載されているはずです。デバイスがあなたのニーズを満たすかどうかは、ここで確認しましょう。SWR Sound 750xの取扱説明書の次のページをよく読むことにより、製品の全機能やその取り扱いに関する情報を知ることができます。SWR Sound 750xで得られた情報は、きっとあなたの購入の決断を手助けしてくれることでしょう。
SWR Sound 750xを既にお持ちだが、まだ読んでいない場合は、上記の理由によりそれを行うべきです。そうすることにより機能を適切に使用しているか、又はSWR Sound 750xの不適切な取り扱いによりその寿命を短くする危険を犯していないかどうかを知ることができます。
ですが、ユーザガイドが果たす重要な役割の一つは、SWR Sound 750xに関する問題の解決を支援することです。そこにはほとんどの場合、トラブルシューティング、すなわちSWR Sound 750xデバイスで最もよく起こりうる故障・不良とそれらの対処法についてのアドバイスを見つけることができるはずです。たとえ問題を解決できなかった場合でも、説明書にはカスタマー・サービスセンター又は最寄りのサービスセンターへの問い合わせ先等、次の対処法についての指示があるはずです。
