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Old 25th August 2006, 06:12 PM   #1
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Default Lm3875 Vs Lm3886

Just finished a 3886 GC from one of Brian's kits and it sounds great. Integrated Glassware's attenuator and it made a nice package. Will need a second amp for Tri amp setup and wondered about the LM3875. Anyone care to compare the sound of these two chips?

Thanks,
Pete
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Old 25th August 2006, 07:21 PM   #2
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one has mute, the other doesn't
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Old 25th August 2006, 07:30 PM   #3
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My experience with these devices is limited. Could you expand on what this means in terms of the sound?

Thanx
Pete
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Old 25th August 2006, 07:36 PM   #4
traw is offline traw  United States
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i didn't notice notable difference.... i think sound difference could sometimes be derived from ommission of the Ci cap (between resistor from - input and ground on non-inv) that appears on 'reference' 3886 schematics.
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Old 26th August 2006, 12:48 AM   #5
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Don't recall whether I installed C1 or not, will check and try it both ways. Other than that your feeling is no difference between the two?

Pete
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Old 28th August 2006, 11:18 PM   #6
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LM3875 has less current output capability and hence, is a lower power part.

-SL
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Old 29th August 2006, 01:39 PM   #7
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i believe the 3875 is meant mainly for 8 ohm loads, whereas the 3886 is a little more flexible and handles 4 ohm loads better. i'm about to build a 3875 GC, i'd build a 3886 instead if there were kits available anywhere...
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Old 29th August 2006, 05:25 PM   #8
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Oh, and not Mute as has been pointed out already. The LM3875 is the no Mute version of the LM3876. If you have no limits on choice or cost then always use LM3886. The only reason to use LM3875 is to save money or if you can't get LM3886.

-SL
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Old 29th August 2006, 09:32 PM   #9
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The difference in Power prompted my original question, why use a lower powered device unless there was some sonic advantage? I guess I'll stay with the 3886 since the results of the first unit were so satisfying.

As to the availability of this chip, Parts Express sells them and I believe they are in stock.

Have had no luck trying to raise Brian about soma additional parts and boards, Any one have any info on that?

Thanks to all for their responses

Pete
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Old 3rd September 2006, 04:21 AM   #10
filgor is offline filgor  Australia
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Default LM3886 better in most ways

The 3875 is better in input refered noise by 2.5dB
(-115.8dB vs -113.3dB at 60W into 8ohm)
Because of this the 3875 also has slightly lower THD+noise at low power 20kHz.

However, the actual Harmonic Distortion of the 3886 is lower by about 3dB at most frequency and output power combinations.

So the 3875 is lower noise and the 3886 is lower distortion.
IMO they both already have very low noise and noise is far less irritating than harmonic distortion. So I would consider the 3886 as superior in sonic terms.

The 3886 also puts out more power for any given load or supply voltage,
At 35 volt rails and 8 ohm load:
the 3886 typically puts out ~60Watts
the 3875 typically puts out ~56Watts

As already mentioned the 3886 has the current capability to handle 4ohm loads more efficiently.

Hope this helps
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