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Old 4th January 2015, 10:07 PM   #1
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Default First amp advice

Hello!

I am new to the site and have been browsing the forums for some time to get some advice on my upcoming project. I love the DIY aspect and have installed my complete truck stereo which consists of a 4 way setup, amps, processing, etc. Last year I built myself a pair of Karma Indignia's based on the audiokarma schematics. The speakers used and crossover parts can be found here:

https://www.parts-express.com/projec...050f94883ec8a2

My question is as follows: What would be a good first amp to build to run these speakers? I am primarily considering either chipamp.com's lm3886 stereo kit or the audiosector lm4780 kit. I am assuming I want a stereo kit and not a dual mono kit. I would like a really nice sounding amp that I can keep for the years to come. I do not think an ebay kit is my first choice given the QC issues people report.

Further down the road I would like to build something really really audiophile like the honeybadger with the deluxe 4u chassis. I want to get my feet wet with a smaller simpler amp for now.

Thank you for everyone's advice!
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Old 5th January 2015, 11:14 AM   #2
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Are these to be installed in the truck...

Gajanan Phadte
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Old 5th January 2015, 11:00 PM   #3
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Hey,
Sorry for the confusion. These will be used in my bedroom or living room.
Peter
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Old 5th January 2015, 11:37 PM   #4
davym is offline davym  Scotland
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The Chipamp kit apparently needs a number of modifications to get the best from it, I have built one and it's very decent.

The Audiosector kit might not need so many mods, you attach the PSU boards to the amp boards (if I remember correctly) so it's a gain clone as opposed to a chip amp.

Both kits will work very well but some prefer the LM4870's sound saying it's less harsh, I don't find LM3886 harsh but it depends on implementation/personal taste/system etc
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Old 6th January 2015, 07:43 AM   #5
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Thanks,

Would the audiosector amp be enough for the speakers? Also, are there any other diy kits available at similar quality?
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Old 6th January 2015, 08:29 AM   #6
Philfr is offline Philfr  France
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Hi pamantea,
Is your speakers have DA175 Dayton, 85 db, 8 Ohm, alu cone ?
What is your listening, quiet or like for party ?
Your source ?
Phil.
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Old 6th January 2015, 04:56 PM   #7
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Quote:
Originally Posted by Philfr View Post
Hi pamantea,
Is your speakers have DA175 Dayton, 85 db, 8 Ohm, alu cone ?
What is your listening, quiet or like for party ?
Your source ?
Phil.
Hi Phil,

Yes, I am using the DA175-8 7" woofer and the DC28F-8 1-1/8" silk dome tweeter. The frequency response is attached and was pulled from:
AK Design Collaborative - Insignia-Class Economy Speakers (a.k.a Indignia) - Page 29 - AudioKarma.org Home Audio Stereo Discussion Forums

For the most part, it will be between quiet and party. I don't think I will ever really need to use the volume to reach "party levels". I am thinking about making a GrubDAC and wiring it with the amp. Would that work? Or are there better suggestions than the GrubDAC at around the same price point? I will then use an iPod or iPhone connected via USB.

Thanks!
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Old 6th January 2015, 07:21 PM   #8
Philfr is offline Philfr  France
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Quote:
Originally Posted by pamantea View Post
Hi Phil,
Yes, I am using the DA175-8 7" woofer and the DC28F-8 1-1/8" silk dome tweeter.
Maybe LM3875 add some "smooth" to your speakers..
Phil.
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Old 7th January 2015, 11:48 PM   #9
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Quote:
Originally Posted by Philfr View Post
Maybe LM3875 add some "smooth" to your speakers..
Phil.
Is the LM3875 more smooth than the other options? What about power?
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Old 8th January 2015, 07:17 AM   #10
Philfr is offline Philfr  France
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Quote:
Originally Posted by pamantea View Post
Is the LM3875 more smooth than the other options? What about power?
http://www.ti.com/lit/ds/symlink/lm3875.pdf
Power is 56 watts with 8 Ohm load, it is very adequate because your drivers are "killed" with about 15 watts near 40 hz..
And yes, LM3875 are a little smoother, that may be better at listening due by alu cone..
Phil.
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