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Topic with many replies

Create your own festival stereo


Author Message
Written on: 18.04.2013 23:56
Lapiki
Posts: 22
Well... i wish i had thought of that, thank you very much icon_smile.gif this makes it a lot simpler.

I read found a post on diyaudio, about a guy that had the same diode question, so this should pretty much be the final schematic:

http://postimg.org/image/x2e6g74f9/

Any tips are much appreciated. The guy that i saw, also had a fuse connected to the battery, but i assume that that is if you want to charge the battery without unplugging it(i intend to be able to unplug it).

P.S. Saturnus, i saw that you use blue tac for dampening.. do you still use this, or have you found an better alternative?

[This article was edited 3 times, at last 19.04.2013 at 00:53.]
Written on: 20.04.2013 21:48
kristoffereid
Posts: 3
Hey! I bet I could find the answer to my question somewhere in this thread, but I'm looking for suggestions for amps and other things we're going to need to build a good stereo. We got these speakers at a flee-market today, they were cheap and sounded pretty good.

http://bildr.no/thumb/1442781.jpeg

Here's the info-label on the back:
http://bildr.no/thumb/1442786.jpeg

We need an aplifier that work with these speakers, can connect to devices with an aux, but doesen't use up all the power of a car-battery. Most of you seem to know a lot more about this than we do, so suggestions is greatly appreciated! icon_smile.gif

[This article was edited 3 times, at last 21.04.2013 at 13:14.]
Written on: 20.04.2013 22:12
kristoffereid
Posts: 3
I'm sorry about the big pictures...
Written on: 20.04.2013 23:20
Martin Horn Pedersen
Official RF person
Posts: 1273
I have removed the pics. They fuck up the forum design. You have to post them smaller or just post a link to them
Written on: 10.05.2013 00:17
Peter Gregersen
Posts: 9
@Kristoffereid. If you're looking for a suitable amp for that kind of setup, i would definitely recommend this cheap, but gret working amp: http://www.amazon.com/LP-2020A-Lepai-Tripath-Class-T-Amplifier/dp/B0049P6OTI.

It uses almost no power as well as it has phono and minijack inputs. For those kind of speakers, i would say you should get about 2-3 40-50 ampH carbatteries to run the stereo the whole festival, without recharging one single time.

Hope this helps.
Written on: 12.05.2013 16:02
kristoffereid
Posts: 3
Thank you Peter Gregersen! I just bought that Lepai-amplifier yesterday, and borrowed two 45ampH batteries from a helpful buddy. Looks like we made the right choices icon_biggrin.gif

[This article was edited 1 times, at last 12.05.2013 at 16:05.]
Written on: 17.05.2013 10:01
Engelman
Posts: 28
I got inspired by Kristoffereid's idea and thought i might get our camp a similar set up. I am thinking of going low-budget and getting a speaker from the flea market (preferably 4 ohms i guess), a Lepai or similar TA2020 amp and powering it on 8 D-cell batteries.

At previous Roskilde festivals we have had a 80's boombox jamming the whole week on one set of 8 D-cell's. We don't need high volumes but I guess the above mentioned setup would give us better sound quality and the possibility to use higher volumes at times.

Battery life is naturally my biggest concern.. If i use only one channel of the amp (mono speaker), will there be some power loss? Also, do you thing it is reasonable to expect the thing to last the whole week with maybe 5hours of low volume playing per day?

I an considering a mono setup as we are coming from Finland and portability is an issue...

Thank you!
Written on: 17.05.2013 11:29
Saturnus
Posts: 3048
A TA2020 is a switching amplifier. It will use more power if no speakers are connected to one or both channels, than if both channels are connected.

At low volume the amp uses about 1.2W so a typical set of alkaline D cells would last about 120 hours. Crank it up and the D cells loses capacity rather quickly but I'm sure it'll last the whole festival on one set if you're careful (or you can buy more).

EDIT: Forgot to mention, the 1.2W is an amp6 or similar TA2020 amp with no power LED. A Lepai or similar amp has a red or blue LED to indicate that the amp is on. That naturally consumes power as well, roughly 0.4W. So runtime will be about 90 hours with such an amp.

(Yes, that means I'm saying the amp at low volume uses the same as 3 LEDs).

[This article was edited 2 times, at last 17.05.2013 at 11:40.]
Written on: 17.05.2013 12:22
Engelman
Posts: 28
Thank you so much for the answer! Very nice to hear that around 90hours of playback is possible.

Is there a similar pre assembled mono amp that could be then used for the setup im doing? I would like it to be mono, so I could put everything inside one speaker. I did a smaller version a few summers ago:

https://dl.dropboxusercontent.com/u/2376499/skobe/sk%C3%B6be.jpg

https://dl.dropboxusercontent.com/u/2376499/skobe/sk%C3%B6be2.jpg

Now i'm looking to beef up rig. The thing played at decent volumes for hours and hours but at around 80% volume, there was some nasty distortion...

FIY I used this amp in the previous "build":
http://www.kemo-electronic.de/en/Light-Sound/Amplifier-Splitter/Modules/M033N-Amplifier-18-W-universal.php

[This article was edited 1 times, at last 17.05.2013 at 12:27.]
Written on: 17.05.2013 13:01
Saturnus
Posts: 3048
No. Low power mono class D amps are extremely hard to find.

Problem isn't particularly great though as you can just parallel both the input and output of a stereo amp, and voila! you have a mono amp.

If I were to recommend one that would be suitable for this it would be: http://www.ebay.co.uk/itm/MKll-Tripath-TA2024-fully-finished-tested-pcb-2x15watt-/261214450843?pt=UK_MusicalInstr_Access_RL&hash=item3cd198349b

£8 incl. shipping isn't going to ruin a budget and the price is low enough that customs is avoided.

(Note that you must connect the same mono signal to both inputs. If you connect a stereo input and have paralleled outputs the amp will go up in smoke instantly).

[This article was edited 1 times, at last 17.05.2013 at 13:34.]
Written on: 24.05.2013 15:07
Peter Gregersen
Posts: 9
I need some help.

We have the following setup available this year:

Last years pair of speakers; included 2 x 2 15 inch midrange/bass units, with 1, 1 inch tweeter in both speakers. That setup played quite well and loud enough to get people dancing all night. But the bass was awful. (I know it's outdoors, but usually it sounds better with another amp.)

We have this amp which is super efficient and plays very, very good concerning the price.
:http://www.pioneer.eu/dk/products/25/29/182/PRS-D800/page.html

We could literally play for hours and hours and we didn't run dry of battery power once.

We would like to step things up a notch this year, and we have a PA speaker system, where the idea is to use the big sub and the satelites with the above mentioned amp.

Specs:
2 x satelites with 1 inch horntweeters and a 10 inch midragne unit. (125 RMS)
1, 15 inch sub with 300 wRMS,

My question is. If we use the new setup and unplug the old amp from the PA system, and replace it with the pioneer, would we then lose the bass power?

There are no separate sub channel on the amp. Should we buy another, and use it in a parallel with the sub and speakers separately connected, or in other words: How do we get the most power from the sub ?

[This article was edited 1 times, at last 24.05.2013 at 15:09.]
Written on: 24.05.2013 15:59
Peter Gregersen
Posts: 9
Saturnus wrote:

No. Low power mono class D amps are extremely hard to find.

Problem isn't particularly great though as you can just parallel both the input and output of a stereo amp, and voila! you have a mono amp.

If I were to recommend one that would be suitable for this it would be: http://www.ebay.co.uk/itm/MKll-Tripath-TA2024-fully-finished-tested-pcb-2x15watt-/261214450843?pt=UK_MusicalInstr_Access_RL&hash=item3cd198349b

£8 incl. shipping isn't going to ruin a budget and the price is low enough that customs is avoided.

(Note that you must connect the same mono signal to both inputs. If you connect a stereo input and have paralleled outputs the amp will go up in smoke instantly).


I found this low power mono class D amp; Maybe that will do the trick?
Im considering usings it myself, just only connected to a sub.http://www.pioneer.eu/dk/products/25/29/182/GM-D8601/page.html
Written on: 24.05.2013 16:09
Saturnus
Posts: 3048
Peter Gregersen wrote:

Saturnus wrote:

No. Low power mono class D amps are extremely hard to find.

Problem isn't particularly great though as you can just parallel both the input and output of a stereo amp, and voila! you have a mono amp.

If I were to recommend one that would be suitable for this it would be: http://www.ebay.co.uk/itm/MKll-Tripath-TA2024-fully-finished-tested-pcb-2x15watt-/261214450843?pt=UK_MusicalInstr_Access_RL&hash=item3cd198349b

£8 incl. shipping isn't going to ruin a budget and the price is low enough that customs is avoided.

(Note that you must connect the same mono signal to both inputs. If you connect a stereo input and have paralleled outputs the amp will go up in smoke instantly).


I found this low power mono class D amp; Maybe that will do the trick?
Im considering usings it myself, just only connected to a sub.http://www.pioneer.eu/dk/products/25/29/182/GM-D8601/page.html



As far as I can tell the difference is that the Pioneer can only be used for subs not full range and it consumes at least 15 times more power, and cost over 20 times more.

[This article was edited 3 times, at last 24.05.2013 at 16:14.]
Written on: 24.05.2013 16:37
Peter Gregersen
Posts: 9
Saturnus wrote:

Peter Gregersen wrote:

Saturnus wrote:

No. Low power mono class D amps are extremely hard to find.

Problem isn't particularly great though as you can just parallel both the input and output of a stereo amp, and voila! you have a mono amp.

If I were to recommend one that would be suitable for this it would be: http://www.ebay.co.uk/itm/MKll-Tripath-TA2024-fully-finished-tested-pcb-2x15watt-/261214450843?pt=UK_MusicalInstr_Access_RL&hash=item3cd198349b

£8 incl. shipping isn't going to ruin a budget and the price is low enough that customs is avoided.

(Note that you must connect the same mono signal to both inputs. If you connect a stereo input and have paralleled outputs the amp will go up in smoke instantly).


I found this low power mono class D amp; Maybe that will do the trick?
Im considering usings it myself, just only connected to a sub.http://www.pioneer.eu/dk/products/25/29/182/GM-D8601/page.html



As far as I can tell the difference is that the Pioneer can only be used for subs not full range and it consumes at least 15 times more power, and cost over 20 times more.


You might be right saturnus. Just found it suitable for my own setup, and then I thought, well. its a class d amp with a power consumption of 24 A at continuos levels. It might only work for subs.

Maybe this would work: http://www.maximintegrated.com/datasheet/index.mvp/id/5177

@ Saturnus. - Would you be able to help with my question as well? icon_wink.gif
Written on: 25.05.2013 12:10
Hr. Adelsten
Posts: 9
Hello fellow speaker builders!

Last year i build a Boominater with all the mats and units after your guide Saturnus.
But this year i want to upgrade the sound lvl a little, and im able to take up to 5 extra Car batterys 60-80 Ah with me, so do you think is would be possible to upgrade the Amp6-Basic with a Amp9-Basic without change any of the old specks? And still be able to have power for the full festival?

Let me please hear icon_biggrin.gif


Written on: 25.05.2013 12:36
Saturnus
Posts: 3048
Car batteries might not be the best choice as you know. Really only a choice if you literally get them for free. At least get some marine or consumption batteries. For example get one of Hegner's 225Ah marine batteries over at www.festivalanlaeg.dk. That should run you some 120 hours at maximum volume (about 225 hours of normal festival use) if you get a 12V->24V dc-dc converter (minimum 10A capable). Think he sell those batteries for DKK800. Delivery possible on campsite.
Written on: 25.05.2013 13:15
Hr. Adelsten
Posts: 9
Well i do get them for free, but my main consern is if the 5 batteries will hold power for the full festival, but sound link it will if you say 225 hours play for 225 AH
Written on: 25.05.2013 13:51
Saturnus
Posts: 3048
Hr. Adelsten wrote:

Well i do get them for free, but my main consern is if the 5 batteries will hold power for the full festival, but sound link it will if you say 225 hours play for 225 AH


Yes. For that battery type. It'll take 320-360Ah worth in car batteries for the same running time if they're all in parallel (naturally means they have to be identical as well), otherwise you could be looking at over 400Ah of car batteries to get the same running time if you use them one by one.

An Ah isn't just an Ah. The amount of power you can get out of your batteries on continuous loads depends on the battery type, size, and load.

[This article was edited 1 times, at last 25.05.2013 at 13:54.]
Written on: 25.05.2013 17:00
Peter Gregersen
Posts: 9
I need some help.

We have the following setup available this year:

Last years pair of speakers; included 2 x 2 15 inch midrange/bass units, with 1, 1 inch tweeter in both speakers. That setup played quite well and loud enough to get people dancing all night. But the bass was awful. (I know it's outdoors, but usually it sounds better with another amp.)

We have this amp which is super efficient and plays very, very good concerning the price.
:http://www.pioneer.eu/dk/products/25/29/182/PRS-D800/page.html

We could literally play for hours and hours and we didn't run dry of battery power once.

We would like to step things up a notch this year, and we have a PA speaker system, where the idea is to use the big sub and the satelites with the above mentioned amp.

Specs:
2 x satelites with 1 inch horntweeters and a 10 inch midragne unit. (125 RMS)
1, 15 inch sub with 300 wRMS,

My question is. If we use the new setup and unplug the old amp from the PA system, and replace it with the pioneer, would we then lose the bass power?

There are no separate sub channel on the amp. Should we buy another, and use it in a parallel with the sub and speakers separately connected, or in other words: How do we get the most power from the sub ?

[This article was edited 1 times, at last 24.05.2013 at 15:09.]
Written on: 25.05.2013 17:37
Saturnus
Posts: 3048
@Peter, I think the reason no one is responding is that they are impossible questions to answer with any authority with having the exact same set-up themselves. Anything else and it would just be wild guesses.
Written on: 25.05.2013 19:35
Hr. Adelsten
Posts: 9
Saturnus, now i have been looking for some time, and i think im going to buy a 225 AH from Hagner, but The Amp9-Basic is 12 or 24 volt, so what will be the advantage of using a 12dc-24dc converter like you suggest?

Thanks for the Help so far!

And ofcource the great Boominator Design xD
Written on: 25.05.2013 19:42
Saturnus
Posts: 3048
Well. If you not running it on 24V then an amp9b doesn't make any sense at all as it will have the exact same output as an amp6 but just use twice as much power to do so . You need the converter to get 24V into the amp9b which will give you the 4x30W output (compared to 2x15W on amp6).

[This article was edited 1 times, at last 25.05.2013 at 19:44.]
Written on: 25.05.2013 19:55
Hr. Adelsten
Posts: 9
Okay, then i think i get it now icon_biggrin.gif
Do you have any 12-24v Adapters you recommend? And if soldering is need it will not be a problem icon_biggrin.gif
Written on: 25.05.2013 20:04
Saturnus
Posts: 3048
Look on ebay ... plenty there. Look for one with 10A (or 240W) rating.
Written on: 25.05.2013 20:17
Hr. Adelsten
Posts: 9
So if im right this one sold do the trick.
http://www.ebay.com/itm/New-240W-DC-DC-Converter-DC-12V-to-24V-10A-Boost-Step-Up-Car-Power-Converter-/181145705085?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item2a2d201a7d
And sorry for all the questions, but better safe then sorry..


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