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Old 12th April 2013, 04:49 AM   #51
lgo51 is offline lgo51  United States
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Default fix that input issue all the way 'round

Quote:
Originally Posted by ufokillerz View Post
i hope someone can help me with this
for the abletec alc1000 modules, the gain is 33.5
i would like to drop that to more comfortable levels like 28db, how can i do this?
would a H-pad work, this is a term i found online, and i am not 100% sure how this works, but 33.5 is way too much, and i rather not attach a attenuator outside of the amp.
You might consider using an input transformer with a 2:1 windings ratio, this would provide a -6 dB voltage transformation - giving you an effective gain of 27.5 dB (squarely in the 26-29 dB range commonly used). And, your driving preamp would now 'see' about a 40k load impedance - going by the report of a nominal 10-12k for the native amp. And, you would have complete galvanic isolation too Lundahl, Cinemag, or Jensen should be able to help with this.

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Old 7th May 2013, 07:23 AM   #52
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Default My exprience of ALC1000 is.

I started using the module about 4 month ago
But the real time I used it is just around a month.

It's because I had to send them back to profusion for RMA.
I've sent it twice,. First was because of faulty switch, module was damaged, Second, the module I got as a replacement made buzzing sound from the module itself so I sent it one more time.

For the first time,, RMA was quick and easy,, second RMA,, the sales manager started not answering, with my several times of email, No answer.. I just sent them for RMA because it was under warranty. Again, the module was damaged, ( by me,, because of faulty switch again.. the switch seems to be very weak, now I realise that) I send him again politely for another RMA. Wether I pay for repairment or replacement, I would wilingly do so, but just no reply. I sent him once again for the RMA,, No replies so far. I am very angry now for their attitude for customers. That module is for DIY, which means damage can be caused by mistakes, not knowingly. If they ask for the repairment fair,, That's fine. But no response at all is very annoying.

The sound itself is good. Very powerful at the bottom. Tight grip to the bass. Neat high sounds. Compared to Hypex Ncore NC400, I find Ncore's have wider sound stage. More revebs than ALC1000. ALC100 is more focused in the middle. Hypex Ncore400 -gain 26.5 ALC1000-33.5 a bit high to match with Pre amplifiers. The difficulty to assemble is... ALC1000 is easier to make monoblocks but it seems to be more volnerable to groundloofs. More volnerable to hums. That might be the case because it has higher gain. No detailed manual with ALC1000. But twice cheper with more power.

If you are considering getting a pair of ALC1000, be careful when conneting standbypin and disable pin. Do what you can not to damage the module - once is ok. twice of RMA -- you might expirience no replies from them.

Lastly,, Letting ALC1000 be on standby mode can make ongoing noise from the module. In standby mode, the module keeps making weak noise from the module- seems that it comes out from the capasitor.

Overally,, I think it is worth the money,, Price is more reasonable than Hypex or ICE modules.
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Old 7th May 2013, 07:33 AM   #53
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Where do you buy these modules for diy ? i only find them for oem.
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Old 9th May 2013, 05:53 AM   #54
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Profusion Splash Screen
I bought some here.
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Old 9th May 2013, 06:09 AM   #55
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Default Anyone used standby mode?

Anyone tried standby mode with ALC1000-1300?
What I did is to short standby pin and disable pin through a switch.
The manager of Profusion also said that's how it goes.

The problem is.. when the modules are in standbymode, I hear some hissing noise from the modules. It seems that the condenser makes that sound when in standby mode. Is it the case for others too? Any ways to fix the problem?

Secondly, When I switch it off, It makes about three times of short popping noise before the relay is open and completely turned off. The manuel says that when the main voltage is under a certain level, the power is turned off. Maybe that's why it makes the noise. The module seems to try to use the voltage from the capacitor, until it is completely turned off. While doing that, just before it is turned off, the module makes popping noise 3~4times. It's not big to the degree that it might cause the damage to the speaker. But the popping noise is bigger than when it is turned on and bothering as well. Any ideas to avoid this noise when turning off? Should I put another switch for standby mode? so I can put it in standby mode and then turn it off?
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Old 4th June 2013, 02:21 PM   #56
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So i bought one of the ALC0100-2300 modules, first impression are really good, dead silent with no signal and no noises what so ever from the onboard power supply.

Also shipping was lightning fast, bought it like last weekend and it arrived today.
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Old 22nd July 2013, 06:06 PM   #57
jpetek is offline jpetek  Germany
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has anybody a idea why some hifi manufactories use normal power supplies?
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Old 4th August 2013, 09:51 PM   #58
juanito is offline juanito  Europe
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Quote:
Originally Posted by Tekko View Post
So i bought one of the ALC0100-2300 modules, first impression are really good, dead silent with no signal and no noises what so ever from the onboard power supply.

Also shipping was lightning fast, bought it like last weekend and it arrived today.
Which pins do you coonect the input signal? From the pdf is not very clear. I'm hoping to recieve my alc0100 board sometime this week.
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Old 8th September 2013, 04:04 PM   #59
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Can someone tell me how i can claculate the input sensivity 33,5db in volt? My pre-amp (AV-Receiver) gives only 1V output and i think 33,5 db is way too high.

lgo51 said something about an input transformator, so can someone give me a link to the correct part which is needed? Why the hell do they make such high input sensitivity in their amps? Icepower are the same with 1,99v input in the ice 125asx2, i can only use 50% with 1V from my av-receiver with it.
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Old 10th September 2013, 08:06 AM   #60
Pabo is offline Pabo  Sweden
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To make it silent, experiment with adding some load from the standby output to GNDs. around 20mA can do the trick but you can go up to 100mA if needed.

It is the standby converter itself that makes the hizzing sound due to pulse skipping at light load.
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