Hello I have had the above amp since 1989 and have been using Mordaunt Short MS30 speakers for the last few years. However I often need to replace the woofers or tweeters presumably due to the incompatibility. Can anyone recommend some suitable speakers to replace the Mordaunt Shorts.
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Some amps have a single RCA socket for a powered sub. If it has not got one of these then the amp has no output for a powered sub. If so then you can only use a none powered subwoofer, which will connect via the speakers of the amp, see the subwoofer manual for how to do this.
I assume you want to use the SU-G91 as a power amplifier to drive your speakers. If your receiver has connections for inserting an equalizer (may be labeled pre-amp output and power amp input), remove the jumpers between the pre-amp and the power amp, then run cables from the pre-amp to the SU-G91 inputs. You can have an equalizer between the receiver and the integrated amplifier. If this is not available, use the recording output (for a tape recorder on older receivers). Note that the volume control on the receiver will be bypassed with this connection.
Use an amplifier with NO MORE than 150 Watts per channel or you be buying new speakers. At this power level don't expect booming bass boost without damaging the speakers. The Rotel generates 130 per side which is very near the safe maximum for those speakers... and the specs look good. If you are not satified with the sound, the speakers are LIKELY the problem. Look at getting good commercial speaakers instead of CONSUMER grade speakers. Go to a music store dealing with bands and musicians and view the products they have to offer. Consumer speakers often fail when people turn up too much bass. At high listening levels hearing damage can result.
Being a 500W amplifier, you need to connect speakers with 300W each. The correct method to connect speakers is red terminal of speaker should be connected to red terminal of amplifier & black to black. The left side to left side speaker & right to right speaker. There may be main & remote terminals. Main speakers are the speakers at local place of the amplifier & remote for remotely placed speakers. I do have Technics SU-V85A which is somewhat similar. Enjoy! A nice piece to listen.
Usually this is a defect in the output amp IC. If you have no experience with repairs of these types of units, have it checked by a service shop. If the output AMP IChas failed, it will cost about $75 for a replacement. This unit uses an RSN3306P IC .
test you speaker maybe there is a bad connection some where is the spk. box its self ,try changing speakers left to right . it the spk. are ok open amp see all the connections within the amp . if this dose not work contact me by mail: firstname.lastname@example.org