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Old 2nd December 2010, 09:46 AM   #1111
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Quote:
Originally Posted by Nick122147 View Post

So it seems like 2 x s350-48 is still the way to go to be sure to avoid this noise.
O.K. I am not sure if you mentioned here the use of torroidal tansformers for T3. It would also make sense because there is existing ready developed the powersupply unit including speaker relays. My views regarding this supply possibility have changed a bit. I found a good SMPS more dry and quick while the torroidal use sounds more relaxed and fuller. This is not a correct comparison because of two different amps listened. Maybe you have made a more correct comparison:

same board - two/three supply types ...

Wishes
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Old 2nd December 2010, 10:48 AM   #1112
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Originally Posted by Nick122147 View Post
I got myself a Meanwell SE-600-48 to try with a pair of T3 and T3e psu boards. That was a big dissapointment, the se-600 runs its fan constantly. It's very loud so it's unusable for living room audio.
I then tried to connect one S-350 36V meanwell onto two T3's with each their T3e. Hadn't tried this exact combination before, last time used the two channel T3e psu board.
But it was the same issue, some high frequency shhh noise, quite audible on my 99db speakers. maybe it will not be a big issue on something like 88db speakers. When I disconnect one amp so that one meanwell only powers one T3, then this noise disappears.

So it seems like 2 x s350-48 is still the way to go to be sure to avoid this noise.
I can confirm this issue and the noise is there also on lower sensitive speakers. So if running the T3 with SMPS the correct is to feed them from two separate SMPS.
I'm using two 400W/48V now and there are not any noise at all.

I must say I'm quite happy with this setup, for the price it's fantastic.
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Old 2nd December 2010, 06:34 PM   #1113
smithie is offline smithie  United Kingdom
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hi guys
ive recieved this amp and power surply and have been busy playing around with.
its already been asked afew times without reply and i would like to ask it again....
can someone please quote the output impendence for the version v1.2 80watt+80watt 8ohm board, irun a sat/sub type speaker combination and ive been trying to use my plate sub amp via the amps speaker terminal connections,the trouble is this way is useless,it lacks life/drive and suffers a one note bass effect,not to mention the level has to be turned up all the way to get the volume from the sub plate amp...this is the only amp that has produced these results,thats why im after the value of the output impedence...somethings a miss/mis-match somewhere.
all the best
smithie
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Old 2nd December 2010, 09:51 PM   #1114
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Is the output of the Tripath amp connected to the input of the plate amp? That absolutely won't work - the amp needs a certain range of load impedance, about 4-8 Ohms.

You'll want to split the signal before the Tripath, and send that to the plate amp.

Or did I misunderstand the connection description?
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Old 2nd December 2010, 09:57 PM   #1115
col is offline col  Australia
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yeah, he's got one of those dumb plate amps that take "high level" inputs. I advise abandoning them and just split the "low level" input. If you want to do it properly get a pre amp:

06072009150

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Old 2nd December 2010, 11:40 PM   #1116
smithie is offline smithie  United Kingdom
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"Is the output of the Tripath amp connected to the input of the plate amp? That absolutely won't work - the amp needs a certain range of load impedance, about 4-8 Ohms."

and can i ask why you think this wont work? or is this just you opionion?
from my understanding of the process the plate amp hardly puts any extra loading on the power amps output,works fine with every other amp ive owned(both valve and solid state) are you telling me that a class d-amp just cant handle this set-up? tried a fatman valve/chip amp the other week with out problems,infact the subs worked a treat via that method so im struggerling to see your resons for that statement.
regarding spliting signal before the tripath,thats been tried.

"yeah, he's got one of those dumb plate amps that take "high level" inputs."

its always a pleasure recieving technical quotes and answers back to your post,so if anyone has any feel free to send them,opinions like above are totally wasted on me however.
i have a valve pre-amp so ive tried most options with this amp,and using pre-outs from a valve pre-amp into my sub plate amp and using the tripath to power the main drivers just doesnt work in my system or to these ears,if your bible is what hifi then maybe its acceptable
i choose speaker output connection to my plate amp by choice,not because i have to,theres plenty of arguments as to which way to go,but to these ears and system when my plate amp is boasting the main amps signal the sub bass is more in keeping with the tone and flow of the mains(good or bad) as its amplifing the same signal that the main drivers are seeing and not some totally different signal being produced by the low level pre-amp output.

so once again the question remains, does anyone know the output impedance of this amp?
all the best
smithie

Last edited by smithie; 2nd December 2010 at 11:42 PM.
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Old 3rd December 2010, 08:26 AM   #1117
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Originally Posted by smithie View Post
"Is the output of the Tripath amp connected to the input of the plate amp? That absolutely won't work - the amp needs a certain range of load impedance, about 4-8 Ohms."

and can i ask why you think this wont work? or is this just you opionion?
There's a filter on the output of the Tripath amp, and it needs a certain load impedance, or the filter action is changed. These amps are rather particular in that regard.
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Old 3rd December 2010, 08:43 AM   #1118
smithie is offline smithie  United Kingdom
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hi kristleifur
many thanks for explaining that,i understand what your saying now,these chip amps are all new to me so alittle more reading up on my part is needed i guess!
all the best
smithie
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Old 3rd December 2010, 08:46 AM   #1119
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Originally Posted by smithie View Post
hi kristleifur
many thanks for explaining that,i understand what your saying now,these chip amps are all new to me so alittle more reading up on my part is needed i guess!
all the best
smithie
My pleasure How is the synergy with your speakers? You had Audio Nirvana gear, right?
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Old 3rd December 2010, 09:17 AM   #1120
smithie is offline smithie  United Kingdom
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hi
im using hawthrone open baffle speakers that are re-inforced with augie(subs) bass drivers,there very high sensitivity drivers(the main drivers).
Hawthorne Audio Silver Iris (15 inch coaxial OB driver) review - [English]
im using these with audionote valve pre and power amps,the plate amp used to power the bass re-inforcement.
ive been running the tk2050 for afew days,i was hoping to set it up exactly the same as my above system but as you know i can not now do this due to the plate amp issue so at present im running the plate amp via my pre outs.
at first i found the tk2020 amp very smooth,wide soundstage but very flat depth,i also found the treble recessed and the little details in the music that make things seem more real just wasnt there.
of course this is just my opinion and to my ears and in my system,also bare in mind that its only been running for afew days just incase theres a break in effect.
all the above isnt ment to be a negative remark,its just how im hearing it,the amp is a bargan and certainly impressive in its own right and could certainly shock afair few people with its sound quality alone,throw in how much these cost including the power surply and your on to a winner
i was hoping to get alittle nearer to the sound of my power amps(then again valves just do somethings others cant),the valve preamp adds a nice effect to the tk2050 which suits me,ive also hard wired and replaced the input cable with some better quality cable which has certainly opened up the sound,ive also replaced the caps with obligetto types which has done wonders for the top end...so its all work in progress still.
would love to get rid of the on board volume pot but i take it thats not such a simple thing to do,as at present its running through two volume pots
the trouble is when the on board volume pot is turned to max i get hum/noise through the speakers,i dont know if this is due to the amp or something else related in my system,so i may not be able to ditch the volume because of this if i can not sort it.
hope this has given a little insight.from my prospective at least.
all the best
smithie
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