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Class D Switching Power Amplifiers and Power D/A conversion

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Old 6th July 2011, 12:07 PM   #2001
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Quote:
Originally Posted by PressureFM View Post
Ah, that's why I was puzzled.

The PHT-407N I've used in my Boominator are 8 Ohm tweeters though, hence the confusion

So my Boominator is actually not well suited for the AMP6B and here all along I thought it was rocking

Mine is definitely only 13 Watt RMS then.
Not exactly. You also have a filter built in (hopefully) so that the impedance is still 4 ohms per side.

But I do recommend an active filter and a 4 channel amp when you're using the PHT-407Ns. It makes sense since they're (as you know by now) really good quality, and getting an active filter will really get them singing. (It will also eliminate the power lost in the L-pad).
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Old 6th July 2011, 12:20 PM   #2002
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Originally Posted by Saturnus View Post
Not exactly. You also have a filter built in (hopefully) so that the impedance is still 4 ohms per side.

But I do recommend an active filter and a 4 channel amp when you're using the PHT-407Ns. It makes sense since they're (as you know by now) really good quality, and getting an active filter will really get them singing. (It will also eliminate the power lost in the L-pad).
Yeah, I do have a filter built-in using capacitors and inductors, as well as a fully assembled AMP9B.

I basically only need input-trafo's (Neutrik NTE10/3) to get the AMP9B rockin'.

But to be honest I am at a bit of a loss as to how to make an active crossover solution?
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Old 6th July 2011, 12:25 PM   #2003
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Originally Posted by PressureFM View Post
Yeah, I do have a filter built-in using capacitors and inductors, as well as a fully assembled AMP9B.

I basically only need input-trafo's (Neutrik NTE10/3) to get the AMP9B rockin'.

But to be honest I am at a bit of a loss as to how to make an active crossover solution?
Ever heard of minidsp? MiniDSP kit | miniDSP
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Old 6th July 2011, 12:30 PM   #2004
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Originally Posted by Saturnus View Post
Ever heard of minidsp? MiniDSP kit | miniDSP
Yeah, I did stumble upon it while researching / reading this thread but had totally forgotten about the miniDSP.

Guess that is my safest route and thanks for bringing it to my attention
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Old 6th July 2011, 06:25 PM   #2005
PCFreak is offline PCFreak  Sweden
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Hello guys, i've been reading this thread for a couple of days now since im planning on building a boombox and this looks like the design im going to use, im gonna run with the 4xHP12W@8ohm and 4xPHT-409@8ohm on a Amp9B. im gonna change the size a little in order to fit the 12"Bas.
Im only gonna use the Boombox for 8hour max and will probably be using a OptimaYellow 12v 38aH gel battery (expensive) so hopefully the battery will cover 8h on a Amp9b.
Since the people whos gonna listen to my boombox is not bothered with sound quality im not gonna change caps or something like that because it's a bit to complicated for me.
Now i just have a few questions;
1. Does the side rooms (where the elements are) need ventilation or any type of basreflex pipes, or should the side rooms be closed to 100%?
2. How long will i be able to play on 12v with the Amp9B, im buying the Amp9B because i don't need so long playtime and it has higher output for future projects.
3. On your design (the first, probably the second aswell) i can't see any space for the battery, is the inner walls cut to make it fit. Maybe the battery you use is small enough to fit?
I hope i can get my questions answered and i reserve myself for misspellings etc. my english is not the best!
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Old 6th July 2011, 06:35 PM   #2006
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A "little" change in box size? That's an understatement. To get the same tuning with HP12Ws the box must be 397 liters internally. I kid you not. The HP12W is a very very poor choice for a compact speaker. So you can drop that idea right away.

2. You didn't read a lot in this post if you missed that, same voltage = same output. The amp9b does not output more than an amp6b on 12V, in fact slightly less.

3. It's small enough to fit

Last edited by Saturnus; 6th July 2011 at 06:39 PM.
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Old 6th July 2011, 06:39 PM   #2007
PCFreak is offline PCFreak  Sweden
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Oh okay, but the 10s does not excist at any reseller untill august and i kinda want to run with 12s, do you know any 12 that's on the same level as the HP10W? otherwise it looks like i have to wait for the 10s and go with them?
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Old 6th July 2011, 07:42 PM   #2008
Wubbaz is offline Wubbaz  Denmark
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Originally Posted by PCFreak View Post
Oh okay, but the 10s does not excist at any reseller untill august....
Yes they do. Check around, there was even a list with all the suppliers in Europe. Plus-elektronik.de should have them in stock.

Off-topic: How do I make it default that I do not subscribe to every thread I make a post in? It is annoying to have to change the notification type each time I post. Cheers
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Old 7th July 2011, 03:34 AM   #2009
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I bought my 10s from ljudia.se

Wubbaz: isn't it only the first message that follows yours that gets sent to your email? stop posting and it won't spam you i guess. :P

Seriously tough I don't have a clue.

Hi, just wanted to come by to tell you that the boominator preformed splendidly at Roskilde festival 2011. the sun-panel actually managed to cover 3-4 mobile charges per day plus the audio output. Rarely played it at full volume though, it's so loud!

I may change the batteries to a more capable type, SLA doesn't really do well with getting flat.

Have a good summer and so on!

Regards, Marcus.
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Last edited by Darkwithin; 7th July 2011 at 03:36 AM.
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Old 7th July 2011, 12:29 PM   #2010
donnib is offline donnib  Denmark
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Originally Posted by Wubbaz View Post
Yes they do. Check around, there was even a list with all the suppliers in Europe. Plus-elektronik.de should have them in stock.

Off-topic: How do I make it default that I do not subscribe to every thread I make a post in? It is annoying to have to change the notification type each time I post. Cheers
I personally would not recommend Plus-elektronik.de. I ordered June 16 and still not received them. They claim the shipment disappeared and now waiting for new shipment but the information from the shop is very poor.
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