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Old 15th April 2011, 10:33 AM   #1
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Default Paralleled LM1876's

Hi guys,
Am planning to go bi-amp with lm1876 for mid+high.I chose these because of low distortion levels and easy construction.
For lows,i run into a problem:i have 2.7 ohm woofers,and am considering paralled 1876s to drive them.Can this work out?I read somewhere that paralleled amps 'drive each other' ,how do i go about this?
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Old 15th April 2011, 10:35 AM   #2
AndrewT is offline AndrewT  Scotland
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Since you don't already know the answer nor the problems that you will face, I strongly suggest you are not ready for paralleling of chipamps.

2.7ohm driver is quite low impedance and an unusual value. Where did it come from?
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Old 15th April 2011, 11:07 AM   #3
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Quote:
Originally Posted by AndrewT View Post
Since you don't already know the answer nor the problems that you will face, I strongly suggest you are not ready for paralleling of chipamps.
Its just 20 wpc,not bad to start of with.
Quote:
Originally Posted by AndrewT View Post
2.7ohm driver is quite low impedance and an unusual value. Where did it come from?
Most of you wont consider them as woofers,i got them from a panasonic boombox.
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Old 15th April 2011, 08:09 PM   #4
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you should not jump into that conclusion, it is still a bass driver, i bet many peeps here used even worse ones in their life at least one time.
and who knows, they might actualy be suitable for your needs, in that case its a pefect unit.

2.7 ohm is realy low, and the problem of using chipamps in paralell is a wee bit complicated. You can with ease destroy both amps, and the speakers them self.
If i was You, i would just find out what is the power handling of Your panasonic speakers.
It may well happen that You can get away with a simple amp. Prehaps the output voltgae (and therefor current) can be limited with a simple resistive voltgae divider at the input, this can protect Your amp from overloading accidently.

Can You post some -any- information about the speaker unit it self?
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Old 16th April 2011, 09:09 AM   #5
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Originally Posted by Arty View Post
find out what is the power handling of Your panasonic speakers.
>Can You post some -any- information about the speaker unit it self?
I already pushed 22w (full range frequency) and it held up,just too much distortion.The magnet is 3" diameter and 0.4".There is nothing else printed on the magnet apart from the impedance.The original amp was a 6.5wpc at 3 ohm 10% thd.Despite the high thd,my dad swears the boombox is the best music system he has ever heard!
[/QUOTE]
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Old 16th April 2011, 11:17 AM   #6
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Default Here is the App for your chip in Bridgemode

It's a dual Power amplifier
and if you bridge it and heat sink it real good


and an use 2 appropriate output filters
Rl

.6uH in parallel with 10 OHms
it will work with work fine with your 2.whatever ohm load
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Old 16th April 2011, 06:06 PM   #7
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Originally Posted by ElecronicsEdC View Post
Here is the App for your
chip in Bridgemode
There is a big difference between 'bridged' and 'paralleled' amps.
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Old 16th April 2011, 06:27 PM   #8
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OK

your chip is a dual amp
to get the most out of a single dual you should Bridge
to Parallel I would use real low value summing resistors
.1 ohm high wattage

the resistors will dissipate off any differences
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Old 16th April 2011, 08:08 PM   #9
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You really need to use an lm3886
68watts

real clean
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Old 16th April 2011, 08:23 PM   #10
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SEMICONDUCTOR KIA6210AH - Electronix Online - Computer and Electronic Parts and Supplies
under 4 dollars

this is the chip inside altec lansing computer subs
I have one here it rocks

I pulled the caps out of the active LP filter
"that easy" converted it to a full range application
it was a 7 dollar thrift \ goodwill store score !

Last edited by ElecronicsEdC; 16th April 2011 at 08:33 PM.
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