Doing a mono output to an 8 ohm speaker with the amp9?

[SuneL]

I'm not hte most handy with cirquits, so I was thinking of using the pre assembeled amp9 for my Roskilde Festival sound system.

Right now I have a 8ohm speaker set up with an old a/b 500 w car amp. It is run by a 12 v car battery (lots of htem over the 10 days).

My questions are:

Can I just replace my old car amp with the amp9?
Can I bridge it to make a mono output?
Is it any good with a 8 ohm speaker?

If yes to all or most of the above.... would it help to ad an extra battery, to make it 24 v?

Hope someone can help me with some tips/info :-)

Kind regards

Sune

[gnome]

I'm not hte most handy with cirquits, so I was thinking of using the pre assembeled amp9 for my Roskilde Festival sound system.

Right now I have a 8ohm speaker set up with an old a/b 500 w car amp. It is run by a 12 v car battery (lots of htem over the 10 days).

My questions are:

Can I just replace my old car amp with the amp9?

yes

Can I bridge it to make a mono output?

no, but you can parallel inputs and outputs however, but that doesn't help you a lot.

Is it any good with a 8 ohm speaker?

well it depends on how loud you want it, because you will only deliver about 5W into the speaker.

If yes to all or most of the above.... would it help to ad an extra battery, to make it 24 v?

yes you will probably want to do that because you maybe disappointed with the output.
But if you're happy with the loudness at 8ohm then stick with that, in fact for the sake of general harmony at Roskilde, don't participate in the loudness war, go for lower power and sit closer to the speakers.

Hope someone can help me with some tips/info :-)

Kind regards

Sune

[SuneL]

no, but you can parallel inputs and outputs however, but that doesn't help you a lot.

When you parallel, you just take the L+ and the R+ from the amp, and put them together into the speaker, and the L- and the R- and put them together into the other "hole" in the speaker to make a combined mono output right?

well it depends on how loud you want it, because you will only deliver about 5W into the speaker.

5w does not sound like much in comparison with my big a/b amp. Bu I did run it sonic impact t-amp with a ta2024 chip. However, that was not very loud.... only enough for early mornings ;-)

yes you will probably want to do that because you maybe disappointed with the output.
But if you're happy with the loudness at 8ohm then stick with that, in fact for the sake of general harmony at Roskilde, don't participate in the loudness war, go for lower power and sit closer to the speakers.

I have been to Roskilde many years now, and we are not in any competition to make the loudest sound system. However we are a pretty big camp, and do wanna have a system, that is loud enoght, that we don't get anoyed by the beats from the big camps in E like Promilleservice and others.

And thanks for the feedback :-)

[V-bro]

Your AB amp will have an internal voltage up-converter that enables really high power from 12v, even in to an 8 ohm load.

The AMP9 will be about 4 times as powerful from a 24V supply voltage and then will definitely make more noise than the 2021B amp.

Do keep in mind though that the AMP9 has fixed input gain and it is pretty low, so from an average MP3 player it will not be able to reach the full output power!! You will then need a preamp or step-up transformer like OEP A262A3E, which will be able to boost the output voltage of the MP3 player signal by about 600%...

[SuneL]

could I use my sonic impact t-amp with a ta2024 as a preamp, and just connect til speaker output from the sonic impact t-amp with a ta2024 to connect to the input channels of the amp9?

[V-bro]

could I use my sonic impact t-amp with a ta2024 as a preamp, and just connect til speaker output from the sonic impact t-amp with a ta2024 to connect to the input channels of the amp9?

No, it's a bridged output device and has no common ground on the outputs whereas the inputs of all these amplifiers do.

[SuneL]

Thanks for the help so far.. so just two more question for now :-)

Do you guys know where to find a good preamp with a volume control that also runs on 12v-24v like the amp9?

... and i now plan to connect my two 12v batteries in series. Some people tell me, that is has to be two of the exact same batteries... is that really so? I have two of the almost same. Same make and model. Both 90 amph agm batteries. One of them I just bought the other day, and one I bought last year, and it has been recharged a couple of times. As I remember, from when I was little, my dad always told me, that when I serialconnected new and old batteries, I would just not get more out of them, then was the worst one can deliver. Isn't that so?

hope you guys can help with this as well :-)

-Sune

[krilli]

It does make sense to me - Let's say we connect a 1Ah battery and a 2Ah battery in series. We take 1 Ampere out of it for 1 hour. Now one battery is empty, but the other still has a charge. If we keep playing, and if they are a lead-acid type that can't do deep discharge, the empty battery could be damaged. If they are a lithium type with a cutoff circuit, then the empty battery's circuit would disconnect the circuit with a half charge still remaining on the other battery. So roughly the same is best.

In your situation I'd take those two batteries you have and use them, without hesitation.