"The Wire AMP" Class A/AB Power Amplifier based on the LME49830 with Lateral Mosfets - Page 141 - diyAudio
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Old 28th May 2012, 08:36 PM   #1401
QRikard is offline QRikard  Sweden
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Quote:
Originally Posted by AP2 View Post
Current availability: 28/05
12xDPS-600-45/55V (Reg LME)
20xDPS-600-55/65V (Reg.LME)
10xDPS-600-65/75V (Reg.LME)

Regards
What is the price of these? Have the shipping been decided and in that case how should we order?
I'm interested in 2 of the 45/55V version, i assume that the performance is equivalent to the higher power version opc tested.
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Old 28th May 2012, 08:38 PM   #1402
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I'm interested in 55/65V version. Please provide more information.
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Old 28th May 2012, 08:42 PM   #1403
qusp is offline qusp  Australia
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the price has been disclosed in the thread 136EU for the group, i'm in talks with Roberto as to how we will have to order, i'm seeing if I can get mine shipped direct as otherwise i'll be stuck with VAT even though I dont owe it, but you guys in EU should probably get shipped together as much as possible to keep work for them to a minimum and maybe keep shipping costs down. i'm in for 2 x 45/55, or 55/65 depending on Roberto's answer to my question

i'll help coordinate as ive already been talking to Roberto about it, but best not waste money on double fees shifting monies around.

what more information is needed?

Last edited by qusp; 28th May 2012 at 08:45 PM.
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Old 29th May 2012, 12:16 AM   #1404
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Ahh, I didn't want to get these yet but in for penny in for a pound... will have to do some extra overtime to cover the spend

2 x 45/55V should be ample for my needs
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Old 29th May 2012, 02:03 PM   #1405
lolo is offline lolo  France
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well, put me in for 6x 45/55v, anything higher and I won't manage to get the heat out passively without going into stupidely low bias settings..

thanks!
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Old 29th May 2012, 03:33 PM   #1406
qusp is offline qusp  Australia
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yeah i'll stick with the 2 x 45/55 which I believe means all of those are gone. honestly though i'm torn between 45/55 and 55/65 the lower will allow me to push higher bias, the latter will allow more flexibility with future setups. I would like to earmark 2 of the 45/55 though, i'll think on it as doesnt look like the 55/65 are going to run out shortly. I may also pick up just one dps400 for sub duties, but i'll have to see
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Old 29th May 2012, 08:01 PM   #1407
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lolo, which case are you planing to use?
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Old 29th May 2012, 09:47 PM   #1408
QRikard is offline QRikard  Sweden
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So i'm not the only one starting to get doubts about 45/55 vs 55/65...
My main issue is that i haven't decided on speakers yet so i don't know how much power i currently need. Second i'm new to the audio world so i don't really know what to expect and i don't want to be limited by the amp when selecting speakers so more power might be a good option even if it feels like a waste of electricity now.

I'm aiming for a 3U 19" rack chassis 400 mm depth with heatsinks on both sides (pesante dissipante from modu). According to the spare parts section this comes with four 200x40x120 mm heatsinks (two per side) each with a temperature coefficient of 0.5 C/W so 0.25 C/W per channel.

Lets assume 400 mA bias that was a good compromise if i remember correctly. That means 36 or 44 W per channel and 127 resp 189 W into 8 ohm according to opcs worksheet.
If we assume that the efficiency of the amp is 65 % that means that 35 % of the output power goes into the heatsink. Which means another 45 resp 66 W. This results in a total dissipated power of 80 W resp 110W (ignoring power supply).
Using the temperature coefficient of 0.25 C/W this results in a temperature difference of 20 C and 27.5 C relative the room temperature. Lets include a derating factor of 0.9 for safety (i live at sea level so it should be 1). This results to a final temperature increase over room temp (25 C) by 25 C for the 45/55V version and 32 C for the 55/65V version.

Both of these sound safe to me for being worst case calculations assuming that my calculations are correct. But i have a feeling that something is missing because this sounds to simple in some sense...
Anyone with a wild estimate on how much power (average) will be dissipated during normal run assuming a fairly inefficient speaker and reasonable listening volume (no hearing damage)?

Still the major problem i have is what type of power do speakers usually require to be driven with reasonable volume without clipping? If i can get away with 45/55 V supply thats great but if there is a significant risk that i will run into speakers that require more i don't want to come up short...
So i would really appreciate some guidelines on this from the more experienced people around.
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Old 30th May 2012, 02:37 AM   #1409
qusp is offline qusp  Australia
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youve already bought the modushop? the heatsink fins on the pessante are a bit pissant for their size and i'de want to make sure they really are rated for that passively.

pretty new area for me too really, need to work it out, probably i'll change to 55/65 but I want to make sure I dont end up in a position I dont have a choice. that being said though, unless I do change I dont think there are any 45/55 left for you to choose

Last edited by qusp; 30th May 2012 at 02:40 AM.
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Old 30th May 2012, 04:33 AM   #1410
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Guys, get 55/65V version. If they'll run hot, you can still cool them actively

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