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Old 17th April 2011, 02:06 AM   #1
keidori is offline keidori  United States
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Default gainclone speaker questions

I am looking to build a gainclone and Ive been researching the matter for a few days now. I can't find any solid information on compatible speakers or specs. Bottom line is I have 2 speaker cabs that are rated for 4-6ohms at 150w RMS and I was wondering how I would go about building a gainclone that would be compatible with these cabs. Below is the manufactures specs. Any help in the right direction would be greatly appreciated.

# Dual 8" woofers and silk dome tweeter
# Power Handling - 150W RMS
# Freq response - 42-23,000 Hz +/-3dB
# IMP - 6 ohms
# Fused circuitry
# SENS. - 89 dB/2.83V/m
# X-over point 3500Hz
# THD < 0.5% about 75Hz at 1W resonance 55Hz +/- 5Hz
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Old 17th April 2011, 06:01 AM   #2
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Have a look at the specifications of the various chip options, some will drive loads of 4-6 ohms and there are a variety of power outputs. Just about an LM3875, 3886 or 4780 will do the job, either as a single chip or parallelled.
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Old 17th April 2011, 06:21 AM   #3
keidori is offline keidori  United States
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Default thanks

Ill take a look thanks for your recommendation.
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Old 17th April 2011, 10:45 AM   #4
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ran 86db jobbies off lm3875 and ref c for ages.... works just fine.
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Old 17th April 2011, 12:59 PM   #5
AndrewT is offline AndrewT  Scotland
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Use a 3886 single as the amp.
Do not parallel yet. Learn first.
Use a lower transformer voltage, following National's guidelines for 4ohm loading. The 4ohm bass/mid will dominate the loading seen by the amplifier and the amp PSU must be designed to not overheat the chipamp with that 4 to 8 ohm speaker.

BTW,
you are in the chipamp section. Don't build a GainClone. It will give all beginners a headache.
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Old 17th April 2011, 01:13 PM   #6
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Quote:
Originally Posted by AndrewT View Post
BTW,
you are in the chipamp section. Don't build a GainClone. It will give all beginners a headache.
This is a trap I still fall into (ie calling a chipamp a gainclone... I think that a lot of people don't realise that a gainclone is actually a clone of the original 47 labs gaincard, which from memory had a very minimal parts count (ie none of the stuff that helps to make the amp stable under all conditions).

I think that there is a wide adoption of the word gainclone to mean any amp based on a chip such as the LM3886, LM3875 etc. Perhaps there should be something in the forum heading to set this straight

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Old 17th April 2011, 01:20 PM   #7
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I like the 75 for beginners, as you can snip off N/C pins and end up with a 5 pin case similar to LM1875, much easier to cope with 5 pins at the start than a bazillion.
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Old 17th April 2011, 01:26 PM   #8
AndrewT is offline AndrewT  Scotland
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But the 3875 has a guaranteed maximum cold output current of only 4Apk.
Great for 8ohm speaker, not so good for a 2.7ohm speaker.
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Old 17th April 2011, 01:50 PM   #9
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True that....
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Old 17th April 2011, 03:06 PM   #10
6L6 is offline 6L6  United States
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AndrewT -

What exactly do you mean by "GainClone" (As opposed to "Chipamp")? A point-to-point wired LM1875? A point wired LMXXXX? One of the same without all the stability components? Just curious in your observations on the subject and your terminology.

Last edited by 6L6; 17th April 2011 at 03:09 PM.
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