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Old 27th March 2005, 09:27 AM   #11
ash_dac is offline ash_dac  United Kingdom
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Hi ,


What do people think of the NAD 3130?

Is it worth upgrading components or cut my losses?

If I can fix the popping problem I may just resell it. My brother says that it's underpowered at 30W!



Regards,


Ashley.
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Old 27th March 2005, 10:17 AM   #12
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@Ashley:
Did you measure the continuous DC-offset at the output?
If it is less than 100mV, you do not need to worry.
Less than 5mV would be nice, but 100mV will not kill the speakers.
Probably the "pop" is resulting from the power up. During power up
the operating points of all nodes are jumping/sloping from zero to their normal steady state values. This is causing the "pop".
To get rid of it you could add a delayed output relay.
You should be able to find several designs for this here in the forum.


@ Chris:
The bug is here. Definitely. Back again, since last winter, when I found this forum.
It is simply the lack of time. I build my last amp 11-12 years back.
Heavy Duty 150W Amp
And right now I am listening to it. I am using it for my current subwoofer.
Tiny 12 litre subwoofer making 15Hz and 600ccm?
And crazy as I am.... right now I am working on two new active subs.
Each one will have a Sadhara Driver from Adire: 12", +/-27mm linear excursion. Size of each cube will be 40cm x 40cm x 35 cm.
The amps will be selfresonant class D, around 800Wrms.
I plan to integrate SMPSs which will give the provison to operate from 120V-277V / AC input voltage and 12V-16V DC car battery as well.
(All my friends are laughing about the 12V topic, because I do not have a car, just a motorbike....)
For DIY I am completely loaded with that two subs......

Heavy collision with time for my friends, work, sports......

But may be after completion of the two subs, I could start some nice
active small satelite speakers with the Dynaudio Esotec drivers of
my current subwoofer ..... ??? !!!!


Cheers Markus
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Old 27th March 2005, 11:04 AM   #13
ash_dac is offline ash_dac  United Kingdom
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Hi,

Amp is worth more than i thought!

http://cgi.ebay.co.uk/ws/eBayISAPI.d...760851483&rd=1

Regards,

Ashley
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Old 27th March 2005, 12:59 PM   #14
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Hi Ashley,
for me it is hard to believe that this amp does not have a
speaker relay. Are you sure about that? Or is there a relay,
which does not work proper and is always ON ?
If this amp really does not have a speaker relay, then you should
change this only if you want to use it on your own.
For ebay you should let it be unchanged IMHO.
If the amp has a speaker relay, which is not proper working,
then you should try to repair it, no matter if you want to sell it or not.

Good luck
Markus
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Old 27th March 2005, 01:06 PM   #15
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BTW:
To avoid the "pop", you could simply switch the speaker selector to the terminal without speakers, when you turn it on.....
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Old 27th March 2005, 04:04 PM   #16
anatech is offline anatech  Canada
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Hi Markus,
Time is what we all lack. Takes me a while and sometimes I get interested in something else. Wife is not happy with the basement!

The NAD does not use a speaker relay. Protection consists of a self reseting breaker on the PCB. Many times these need to be replaced. I use fuse holders on the back panel to replace those things. Your idea of using the speaker switch to eliminate pops is good. Most people won't do this. Also, I just worked on an amp with 250mV DC offset. I had to match the diff pair xistors (not NAD). Offsets dropped to about +20mV. Depending on the design, I may accept 100mV DC offset. I doesn't make me to happy though.

-Chris
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Old 29th March 2005, 08:01 AM   #17
djk is offline djk
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Doesn't have a relay?

That's a design choice, not a defect. Money is involved.

It doesn't have a remote, or provide draft beer either.

30W is underpowered?

Power is log, 300W only plays twice as loud as 30W.

Put that amp on a pair of Klipsch Cornwalls and try and tell me it doesn't play loud enough.

You don't like it?

Fine, its yours to get rid of.

Find something you like better before you dump it, it may take a bit more effort than you think.
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Old 29th March 2005, 04:28 PM   #18
ash_dac is offline ash_dac  United Kingdom
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Hi,

I currently have a pair of cheap speakers(surround sound monitors) connected to them bacause I was worried about the popping.

Now I have a work around I can probably buy a decent pair of speakers, and really see what the amp was intended to do.


Regards,


Ashley.
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Old 29th March 2005, 08:54 PM   #19
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Yes, I also think you can go for some nice speakers.
If you use the speaker selector to avoid the pop, it
should be fine, even for less rugged speakers.
And if that amp sounds fine, then why worry about
its age or low power?

DJK is right. Depending on the speaker, 30W will be
more than loud enough.
And also right, if 30W are not enough, then 50W also will not be
enough. Every doubling of our human loudness perception requires
a full dekade more power.....
If somebody is always running into clipping with his amp, he would
really need step up in large scale to overcome this succesfully.
(Or pick speakers with 100dB@1W)
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Old 29th March 2005, 10:59 PM   #20
anatech is offline anatech  Canada
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Of course, output power does not begin to tell the story with an amp. Things like current capability and overload recovery are very important. It's also nice if the heatsinks are big enough so the amp doesn't go boom.
I will say that a poor design can survive in low power because there isn't enough heat and energy to kill the amp. The higher power designs are not so forgiving.

Now I'm a guy that listens softly .... and cranks it sometimes. I find that amps 100 ~ 200W are enough because the headroom is for peaks. Even though the peaks may not show on a smaller amp, they are there.

-Chris
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