Michele
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Posts posted by Michele
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Many thanks for the manual link...
Grazie
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Many thanks.
I connected to 8 ohms ampli tap, lst impedence 10,4 ohms
Grazie
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On 6/11/2020 at 3:57 AM, ar_pro said:
From the MC2205 manual:
If a load impedance is used that is lower than the output impedance tap, then reduced power and possible distortion will result.
The LST is nominally a 4 ohm system, but the manual advises that its actual impedance will depend upon the position of the autotransformer switch.
Here's the McIntosh connection recommendations for different loads.
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I recognize this problem using sound test cd with the low frequency track.... in the beginning there was some vibration coming out from the cross-over back panel due to gasket worn out. i replaced in both cabinets and tested again with the same low frequency track with good result. i tried to increase little bit the volume looking the woofers moving good without any noise, but after few extra dB start to have some scratch noise coming from all speakers, woofer, mids and tweeters.. no any power guard alarm from ampli and the power showed by wu-meter was 20 watts... not both speakers left and right in the same time, first left and with one extra dB also the right.
Please note that the fuses has been already changed, and spectral balance control cleaned. With this scenario a start to think about the exhausted capacitor.
I measured the impedance of my LST and shoved on my Fluke instrument 10,4 Ohms: looking into cross over layout there is one 10 Ohms resistor connected in parallel of capacitor. So with this impedance, where is better to connect on my McIntosh output? 2, 4, or 8 Ohms?
Really many thanks for your comments, help.
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Hi, good evening,
happen on both speakers, medium volume... I discovered this problem with cd sound test low frequency track. Sound good up to abt 20 watts after that start this noise. Left and right speakers not at the same time. Same test with AR 3a and ok, sound good.
actually the speakers are connected to McIntosh 2205.
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Hello to everybody,
i think that the 2500 uF capacitor in the cross-over start to be tired, due to some strange noise in all audio spectrum with medium power.
Do you suffered the same in all your experience? In case this capacitor is exhausted, where i can find? The value is not standard ( not polarized value ).
Many thanks for yo comments/help.
regards, Michele
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Good day to every body...
I'm again asking your good experience regarding the proper connection of the tweeters on the frontal terminal...
Most probably are not properly connected, positive and negative, ( during past restoring ) and up to now I don't know how to check...
Have you an idea how the positive and negative wires must be connected on the front terminals? ( parallel and series of the speakers ).
Really many thanks for your kind help.
Michele
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Good day, the tweeters are with new dome due to damaged ones from previous owner...
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Ok Roy,
thanks again... I will keep you update regarding my restoring job.
keep in touch
michele
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Dear Roy,
..... unbelievable.... I bypassed the fuse and the sound is coming back !! Really many thanks for your support..
and what do you think about to leave in place the bypass jumper or change type of fuse?
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Dear Klaus good afternoon, many thanks for your reply. You mean that these caps are to keep the impedance in safe value for the ampli load.
Just to better explain my first question, is due to the fact that the low frequency of my LST are very poor and make one test bypassing these caps and resistance only for the woofer, immediately change the sound and coming good. Could be possible that the caps are exhaust? and affect the sound? What do you suggest?
Really many thanks for your help.
Michele
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Good day, somebody can help me to understand the reason of the caps installed on the input (negative wire) of the LST crossover?
Why is not installed also on the 3a?
Sorry for my stupid question.
AR LST crossover
in Acoustic Research
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JKent good afternoon, just to better understand... i tested with fluke ohmmeter the impedance on the LST terminals and the reading is 10,4 ohm. Looking into cross-over there is one 10 ohm resistor connected in parallel on the 2500 uF capacitor.. it is correct?
many thanks