Searching for 12v small amp (no class T or D)
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Forum Name: 12v Powered Systems
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Topic: Searching for 12v small amp (no class T or D)
Posted By: SebP
Subject: Searching for 12v small amp (no class T or D)
Date Posted: 30 January 2012 at 3:55am
| Hi, I'm searching for a small 12v amp, can be between 10 to 20 watts RMS, mono or stereo, no filter or correction, just simple and good amp (no class T and no class D). Any idea? |
Replies:
Posted By: infrasound
Date Posted: 30 January 2012 at 12:00pm
| Why not class T/D? |
Posted By: Saturnus
Date Posted: 30 January 2012 at 12:58pm
|
It's not possible.
A class A/B amp has a (highly) theoretical efficiency of 65% so it's basically not possible to get more than 11.7W out of a class A/B amp at 12V supply voltage into a 8 ohm load when it's fully bridged.
With realistic real life efficiencies the limit is around 8W for class A/B amp into 8 ohms fully bridged on a 12V supply.
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Posted By: rich_gale
Date Posted: 30 January 2012 at 3:20pm
funny. my car amplifier will kick out 300w rms at 8r running at 14.4v. If the published specs were indeed lies, the 8watts you suggest it is producing is the loudest 8watts I have ever heard. It annoys me, and probably many more people on here the way in which you go about informing people with repeated unhelpful information like the above. What makes it worse is that you are so good at making it sound as if you know what you are talking about. In what way, shape, or form, does your response help the original poster? ------------- REFLEX ALL THE WAY.... (however, im playing with horns again...) That ok Mister Valiant? :) |
Saturnus wrote:Posted By: rich_gale
Date Posted: 30 January 2012 at 3:25pm
|
id look at a small 2 channel from the likes of sony. BOOM:- http://www.ebay.co.uk/itm/SONY-AMP-XM-44ONX-/250978100986?pt=UK_In_Car_Technology&hash=item3a6f75e6fa#ht_500wt_1361" rel="nofollow - http://www.ebay.co.uk/itm/SONY-AMP-XM-44ONX-/250978100986?pt=UK_In_Car_Technology&hash=item3a6f75e6fa#ht_500wt_1361
perfect. this will give you about 80watts rms into 4r bridged @12v from what i remember when i used to use one. it sounded brilliant. and cost me 10 quid. at 8r you probably going to be running an rms amp power of 50watts? even if it were 10 watts rms it'll do the job, and has an idle current draw of just 400mA ------------- REFLEX ALL THE WAY.... (however, im playing with horns again...) That ok Mister Valiant? :) |
Posted By: SamV
Date Posted: 30 January 2012 at 3:29pm
| I might have something suitable but not sure if I want to sell. It's a lovely Caliber CA60 |
Posted By: rich_gale
Date Posted: 30 January 2012 at 3:39pm
Thats the sort of thing right there! i wish modern stuff had such a good 'workhorse' look about them. I wish the old PG M series were not so expensive these days. My MMATS LM2125 has that no nonsense look about it too. ------------- REFLEX ALL THE WAY.... (however, im playing with horns again...) That ok Mister Valiant? :) |
Posted By: Saturnus
Date Posted: 30 January 2012 at 4:37pm
|
Not funny. We both know your post is not true. The supply voltage to the amp is not 12V or even 14.4V. There's a built in dc-dc converter, so it technically doesn't count as 12V (or 24V for that matter). I'm just stating fact. It might be helpful to know what the limits are when you don't have access to a dc-dc converter. |
Posted By: rich_gale
Date Posted: 30 January 2012 at 6:57pm
|
why bring into your unhelpful information into this topic, especially in the condescending manner you introduced it. basic fundamental electrical knowledge is not what the original poster asked for. He just wants a unit that will take a 12vdc input and give him the power he asks for. If not for the reason of being condescending, what point were you trying to make? It doesn't make sense to me why anyone would think to write what you did. What help did you offer, what did you get out of it? its nuts if you ask me. ------------- REFLEX ALL THE WAY.... (however, im playing with horns again...) That ok Mister Valiant? :) |
Posted By: Saturnus
Date Posted: 30 January 2012 at 7:37pm
| rich, you get dummer to listen to by the post. It's obvious at this point you have too many posts if you can't figure it out. |
Posted By: slaz
Date Posted: 30 January 2012 at 7:44pm
|
Now now girls .... calm down. @Rich .... yeah he's being a bit pedantic about the 12V supply business, but technically correct. @Saturnus .... it would have been more sensible/correct to ask if the OP meant a module running off 12V natively, or a integrated, cased, amplifer machine ... wouldn't it ? ------------- REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON |
Posted By: rich_gale
Date Posted: 30 January 2012 at 10:37pm
I been here a long time. and not run into idiots like you before. you are like a grey cloud mate. so unhelpful. hopefully you'll go away soon. Slaz puts it perfectly. its no skin off my nose, I get bored of his continued desire to be pedantic in an unhelpful and misleading way. I just hope this prick doesn't deter too many people from using common sense. ------------- REFLEX ALL THE WAY.... (however, im playing with horns again...) That ok Mister Valiant? :) |
Posted By: slaz
Date Posted: 30 January 2012 at 11:19pm
.... although I must say I've been a bit inclined before now to get a tad pedantic when folk ask highly ambiguous questions - without thinking a bit, and stating something about requirements/expectations/performance/priorities/context etc. We shouldn't have to ask a zillion questions before offering help/advice/solutions. ------------- REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON |
Posted By: SebP
Date Posted: 31 January 2012 at 1:54am
|
What I want can be an amp module or integrated, it's not a problem. This amp will be used for speaker measurement, essentially response curve that can be done anywhere on 12v. I don't want class T or D because I've founded these amps are more sensitive to the load than A/B class. I think I will use just 1 watt on measurement, but need headroom so why 10 to 20 watts. |
Posted By: SamV
Date Posted: 31 January 2012 at 1:59am
|
What you really want is a Genesis amp. They are lovely sounding things. However they are technically class G/H. That said any small amp from a respected manufacturer would do you. This doesn't include Sony, unless it's their premium stuff. Anyways, what's your budget? Which reminds me, I wonder what Gordons upto these days. |