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The AKAI 1720 model reel to reel tape recorder described in this Manual is quite an old unit - circa late 1960's. As a consequence, the description of the mechanical details - and adjustments thereof - is quite critical. The manual does this quite well. The schematics are also well presented and have detailed PCB overlays. Probably the only negative is that some half-tone detail has been lost from the original manual as it has been scanned in simple B&W.
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Perfect source for service manuals: fast and professional transaction; high quality, perfect readable and largely scaleable PDF; complete schemes, diagrams and spare part list. Tnx a lot, cu again!!!!
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This was the Sony CCU-500A Service manual I was looking for.
The price was reasonable.
The permission to download was quck.
I will use Owner-Manual.com for all my manual needs.
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Excellent printing quality.
A complete and very usefull service manual with all details.
GREAT SERVICE AT VERY LOW PRICE!
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Multi Channel Surround Setup
x Center speaker size (CENTER) Initial setting : LARGE � If you connect a large speaker that will effectively reproduce bass frequencies, select �LARGE�. Normally, select �LARGE�. However, if the front speakers are set to �SMALL�, you cannot set the center speaker to �LARGE�. � If the sound is distorted, or you feel a lack of surround effects when using multi channel surround sound, select �SMALL� to activate the bass redirection circuitry and output the center channel bass frequencies from the front speakers (if set to �LARGE�) or sub woofer. *1 � If you do not connect a center speaker, select �NO�. The sound of the center channel will be output from the front speakers.*2 x Rear speaker size (REAR) Initial setting : LARGE � If you connect large speakers that will effectively reproduce bass frequencies, select �LARGE�. Normally, select �LARGE�. However, if the front speakers are set to �SMALL�, you cannot set the rear speakers to �LARGE�. � If the sound is distorted, or you feel a lack of surround effects when using multi channel surround sound, select �SMALL� to activate the bass redirection circuitry and output the rear channel bass frequencies from the sub woofer or other �LARGE� speakers. � If you do not connect rear speakers, select �NO�.*3
z About speaker sizes (LARGE and SMALL)
Internally, the LARGE and SMALL settings for each speaker determine whether or not the internal sound processor will cut the bass signal from that channel. When the bass is cut from a channel, the bass redirection circuitry sends the corresponding bass frequencies to the sub woofer or other �LARGE� speakers. However, since bass sounds have a certain amount of directionality, it best not to cut them, if possible. Therefore, even when using small speakers, you can set them to �LARGE� if you want to output the bass frequencies from that speaker. On the other hand, if you are using a large speaker, but prefer not to have bass frequencies output from that speaker, set it to �SMALL�. If the overall sound level is lower than you prefer, set all speakers to �LARGE�. If there is not enough bass, you can use the equalizer to boost the bass levels. To adjust the equalizer, see page 40.
Hooking and Setting Up the Speaker System
x Rear speaker position (REAR PLACE)* Initial setting : BEHIND This parameter lets you specify the location of your rear speakers for proper implementation of the Digital Cinema Sound surround modes in the �VIRTUAL� sound fields. Refer to the illustration below. � Select �SIDE� if the location of your rear speakers corresponds to section A. � Select �MIDDLE� if the location of your rear speakers corresponds to section B. � Select �BEHIND� if the location of your rear speakers corresponds to section C. This setting only effects the surround modes in the �VIRTUAL� sound fields.
z *1~*3 correspond to the following Dolby Pro Logic modes
*1 NORMAL *2 PHANTOM *3 3 STEREO
90° A 60° B C 20° 30° C B A
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