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Old 23rd March 2008, 05:39 PM   #1
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Default mono amps

i have been curious about chip amps for a minute and i was wondering if there was a kit maker out there that has a front to back mono,not bridged stereo, design. i'd like to do a pair of mono amps . what type of power can i expect in comparison to a regular stereo setup?
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Old 23rd March 2008, 06:22 PM   #2
AndrewT is offline AndrewT  Scotland
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There will be a few suppliers doing mono chipamp kits.
The power from a mono chipamp should be near identical to that from a stereo amp with two chipamps or one dual chipamp inside.
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Old 24th March 2008, 09:55 AM   #3
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I believe that monobloc amplifiers can potentially provide for additional dynamics.

Readily available mono "power amplifier" kits include, audiosector.com, chipamp.com, k50, and k106. There are more. You can find those with a search.

Perhaps Andrew will happen along and suggest the location(s) of readily available preamplifier kits? (hint) That would be great.
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Old 25th March 2008, 07:29 AM   #4
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hi guys, i just got in from work. i took a look at the audiosector ssite and from what i caould see , his setup starts out as a stereo amp. i may be mistaken. i don't want to have to bridge to get mono. i want to go mono from the beginning. any suggestions? if you could please post links to sites. as far as volume control,i want to use the nht passive volume control for starts i may feel the need for dact at a later date.
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Old 25th March 2008, 07:29 AM   #5
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this is a link to the dact peice i'm considering:

http://nhthifi.com/current/products/pro/pvcpc.html

the goal isa 60$dvd player, the passive volume control, the mono chip amps , a a diy two way speaker and call it done. i need about 50-100 watts per side to make it right
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Old 25th March 2008, 09:04 AM   #6
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That's altogether very interesting.

The link leads to a remarkably expensive potentiometer. Normally, I'd pay about $1. The challenge of quality on the item in the link isn't difficult because its 4.7k--not much in the way of audio signals because it doesn't do much (unless you use the XLR version).
However, that item comes with a slight risk, that if the source device has a capacitor (dc block role) at the output, then bass response could be insufficient, due to the unusual load.
Reference: Spec for line level is 10k, and I'd rather see 20k, just in case.

Suggestion: Instead of any sort of passive preamplifier, use those funds for the recommended preamplifier that fits, "known good" with your power amplifier modules of choice.

Suggestion: On shopping for power amplifier module kits, check out "monobloc" and "dual mono" configurations because those seem to fit with your description.
Reference: Check for reliance on preamplifiers, because "may be operated without" doesn't mean optimal results without an active buffer/active preamplifier. This occurs whenever the power amplifier module has already been engineered to operate optimially along with a active preamplifier--as an expected parameter.
Reference: You can find details on satisfying preamplifier-poweramp options (creates a complete amplifier) here at diyaudio.com with the search. There are many options.

Suggestion: If PA use or hearing damage isn't required, then you might want to widen the scope of the shopping to include LM1875, which in maximum sensible configuration produces only 30 watts--yet it is known to do so in high fidelity without a preamp, and still gives fierce driver control along with good dynamics. Its a "soft clip" style and it does operate 4 ohm drivers if you wish. Although it may miss the mark on your power requirements, it does accomodate your choice of potentiometer/passive preamp, as listed in the link above.

If these answers sound a bit odd, its because my writing skills are terrible and because I don't know the exact application for which to match up an amplifier. So, its going to make a lot more sense (no guarantee whatsoever) if you mention the application.
What kind of music do you prefer? Is this for home theatre? Will it be operated without eq (quite difficult for popular music)? What is the nature, size, efficiency of the speakers? Are party volume levels expected? Is there a ready comparison point for this new project?

Hey, and, have fun!
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Old 25th March 2008, 05:58 PM   #7
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i just nticed a goof on mym part. the link i posted is to the nht piece, not nht. that's what i get for "tired-typing"
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Old 25th March 2008, 06:36 PM   #8
badman is offline badman  United States
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www.marchandelec.com has some chipamps and amp kits that are available for monoblock config.
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Old 25th March 2008, 08:39 PM   #9
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Quote:
Originally posted by audfile74
i took a look at the audiosector ssite and from what i caould see , his setup starts out as a stereo amp. i may be mistaken. i don't want to have to bridge to get mono. i want to go mono from the beginning.
The LM3875 "setup" on Audiosector is dual mono, no bridging (although I don't understand your mysterious aversion to bridging). You can also get LM3886 dual mono boards/kits from chipamp.com.
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Old 26th March 2008, 01:32 AM   #10
CarlosT is offline CarlosT  United States
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The LM3875 amp from Audiosector is a mono amp in that the PCB is pre-scored to be split into two mono sections. This is an excellent board if you're not combining channels which it sounds like you're not.

The rectifier section is also pre-scored and can be detached which is handy.
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