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IanCanada's Latest RPi GB Goodies Impressions... and your tweaks, mods and hints...
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Old 11th November 2019, 07:47 PM   #1071
randytsuch is offline randytsuch
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IanCanada's Latest RPi GB Goodies Impressions... and your tweaks, mods and hints...
Quote:
Originally Posted by NicMac View Post
I did not know Bisesik made them.
Not the best pic, but here it is
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File Type: jpg IMG_4123.jpg (969.0 KB, 369 views)
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Old 13th November 2019, 06:41 AM   #1072
yunyun is offline yunyun
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Join Date: Jun 2019
Quote:
Originally Posted by iancanada View Post
I’m working on this comparison test for a while. I'd like to share my results here with you. Sorry for the delay. I could be wrong. Just for you to reference. I picked up these three because they have the same configuration. I could have more reports for others down the road.

#3 eBay 600:10K audio transformer

I bought this pair of 600:10K transformers off eBay. They are not expensive but look pretty decent. I didn’t expect too much from them. However the real listening test did give me some surprise. They have all the sound signature of a typical transformer I/v stage. Nature, analog, peaceful and without any additional flavor. I would stack with them if didn’t experience the other two. I ran them at my LL1544A transformer I/V PCB with same schematic and same configuration. The only thing is that the footprints don’t fit very well. If I have chance to design the transformer I/V II PCB I’d like to make it compatible with them.

If you have never tried the transformer I/V, I would highly recommend this one as starting point.

#2 LL1544A

My transformer I/V PCB was originally designed for them. I have been using them for a long time before I had the BisesiK transformers. I have to say I’m very familiar with the sound. For me, it’s my first transformer I/V that could touch the ‘high end’ in my heart. Besides all the sound signature of a typical transformer I/V stage, LL1544A has higher sound density and plays music more dynamically. Especially it has a very beautiful mid-high range which makes the music a little sweet feeling. I enjoy listening to my favorite vocal jazz with them very much. I could listen to music for a long time almost forgot I was doing comparison test.

LL1544A I/V stage will suitable for all kinds of music and all kinds of system

#1 Bisesik transformers

I must put them in the first position though they are not the kind of transformer I/V that you can fall in love with them immediately at the first time you use them. However, after two weeks of run in, I’m getting in love with them more and more and for now I almost can’t live without them.

If I had only one word to express them I would use the word ‘perfect’. They are not good at certain frequency range but good at all frequency ranges. The low rang could be extended much lower (why they are so big?) than other transformers which feature could be looked upon as common weakness of all transformer I/V stages. So I’m considering maybe I could degrade my speakers from B&W802 to B&W803 because of that. Just kidding! They sound not only with higher density at full frequency range but also play music much vividly. The bigger stage and bigger band you are listening, the stronger you feel about that. If I had another word to use, I would use the word ‘musical’. They play all music with emotion. You can feel the whole atmosphere surrounding you. When I’m listening violin with them, I almost couldn’t help cry. The Bisesik transformers are suitable for all kinds of music. But if you really like the classical music, my advice is that sticks with this one no need to consider any others.

I had a pair of Japanese Oyaide AR-910 pure silver XLR cables. They are pretty decent but I always feel the high range sounds a bit strange when I use them with other I/V stage. However, with Bisesik transformer, everything becomes correct and precision. When I use this configuration listening the sound track of film Pirates of the Caribbean, The Curse of the Black Pearl (I like the big band), I was almost shocked. The huge band and the whole stage were surrounding me and I can hear each hidden details. All instruments are playing vividly together at their positing. I can feel each of them. This feeling could be even better than I was in a real theater.

Though I put Bisesik transformers in the first position, but I wouldn’t recommend them for you if your system is not good enough. The better system you have, the more advantage of these transformers you can feel.

My system for listening test

Transformer I/V for test

1. ES9038Q2M DM DAC HAT (with three independent 3.3V voltage rails)
2. ShiledPi
3. FifpPi with Pulsar 90.xxx MHz clock
4. ReceiverPi
5. RPi3
6. LiefPO4 power supply with ultra capacitor conditioners at both 5V RPi rail and the 3.3V FifoPi clock rail.

The rest of the system
1. B&W 802 D2 speakers
2. PASS XA160.5 amplifiers
3. PASS XP-10 per-amplifiers


Ian
The distortion of the audio transformer is usually not low. Distortion is just that different people are singing the same song, so even if the audio transformer causes a lot of distortion, it may be good. However, the distortion caused by the audio transformer is not necessarily everyone's favorite.

Last edited by yunyun; 13th November 2019 at 06:45 AM.
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Old 13th November 2019, 08:14 AM   #1073
yunyun is offline yunyun
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Join Date: Jun 2019
Quote:
Originally Posted by iancanada View Post
Iím working on this comparison test for a while. I'd like to share my results here with you. Sorry for the delay. I could be wrong. Just for you to reference. I picked up these three because they have the same configuration. I could have more reports for others down the road.

#3 eBay 600:10K audio transformer

I bought this pair of 600:10K transformers off eBay. They are not expensive but look pretty decent. I didnít expect too much from them. However the real listening test did give me some surprise. They have all the sound signature of a typical transformer I/v stage. Nature, analog, peaceful and without any additional flavor. I would stack with them if didnít experience the other two. I ran them at my LL1544A transformer I/V PCB with same schematic and same configuration. The only thing is that the footprints donít fit very well. If I have chance to design the transformer I/V II PCB Iíd like to make it compatible with them.

If you have never tried the transformer I/V, I would highly recommend this one as starting point.

#2 LL1544A

My transformer I/V PCB was originally designed for them. I have been using them for a long time before I had the BisesiK transformers. I have to say Iím very familiar with the sound. For me, itís my first transformer I/V that could touch the Ďhigh endí in my heart. Besides all the sound signature of a typical transformer I/V stage, LL1544A has higher sound density and plays music more dynamically. Especially it has a very beautiful mid-high range which makes the music a little sweet feeling. I enjoy listening to my favorite vocal jazz with them very much. I could listen to music for a long time almost forgot I was doing comparison test.

LL1544A I/V stage will suitable for all kinds of music and all kinds of system

#1 Bisesik transformers

I must put them in the first position though they are not the kind of transformer I/V that you can fall in love with them immediately at the first time you use them. However, after two weeks of run in, Iím getting in love with them more and more and for now I almost canít live without them.

If I had only one word to express them I would use the word Ďperfectí. They are not good at certain frequency range but good at all frequency ranges. The low rang could be extended much lower (why they are so big?) than other transformers which feature could be looked upon as common weakness of all transformer I/V stages. So Iím considering maybe I could degrade my speakers from B&W802 to B&W803 because of that. Just kidding! They sound not only with higher density at full frequency range but also play music much vividly. The bigger stage and bigger band you are listening, the stronger you feel about that. If I had another word to use, I would use the word Ďmusicalí. They play all music with emotion. You can feel the whole atmosphere surrounding you. When Iím listening violin with them, I almost couldnít help cry. The Bisesik transformers are suitable for all kinds of music. But if you really like the classical music, my advice is that sticks with this one no need to consider any others.

I had a pair of Japanese Oyaide AR-910 pure silver XLR cables. They are pretty decent but I always feel the high range sounds a bit strange when I use them with other I/V stage. However, with Bisesik transformer, everything becomes correct and precision. When I use this configuration listening the sound track of film Pirates of the Caribbean, The Curse of the Black Pearl (I like the big band), I was almost shocked. The huge band and the whole stage were surrounding me and I can hear each hidden details. All instruments are playing vividly together at their positing. I can feel each of them. This feeling could be even better than I was in a real theater.

Though I put Bisesik transformers in the first position, but I wouldnít recommend them for you if your system is not good enough. The better system you have, the more advantage of these transformers you can feel.

My system for listening test

Transformer I/V for test

1. ES9038Q2M DM DAC HAT (with three independent 3.3V voltage rails)
2. ShiledPi
3. FifpPi with Pulsar 90.xxx MHz clock
4. ReceiverPi
5. RPi3
6. LiefPO4 power supply with ultra capacitor conditioners at both 5V RPi rail and the 3.3V FifoPi clock rail.

The rest of the system
1. B&W 802 D2 speakers
2. PASS XA160.5 amplifiers
3. PASS XP-10 per-amplifiers


Ian
I have noticed that there is an isolation transformer in the photo. However, in my experience, it is better to use a well-designed grounding box than an isolation transformer.
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Old 13th November 2019, 07:20 PM   #1074
sq225917 is online now sq225917  United Kingdom
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In my experience grounding boxes do nothing at all, better to use a functional EMI filter and DC blocker.
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Old 13th November 2019, 07:21 PM   #1075
sq225917 is online now sq225917  United Kingdom
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And all of the transformers tried are very low distortion mic pre amp style units.
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Old 13th November 2019, 10:38 PM   #1076
iancanada is offline iancanada  Canada
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IanCanada's Latest RPi GB Goodies Impressions... and your tweaks, mods and hints...
The one I'm using for power line is a balanced isolation transformer. This configuration is widely used in recording studios to reduce the noise. Too many PWM devices hooked up to the power line, so it's impossible to take good AC power directly from the wall. My XA160.5 mono blocks consume a lot of power. I have two of those, the 5KVA one sounds better than the 2.5KVA, especially the low range. But both of them are much better than without.

Greg uses PS audio re-generator. I believe it's a better solution but I never got change to experience it.

Now I'm pretty nervous about the power line. It sounds differently in the different period of time. I don't know what's the magic of a 'grounding box', but I think a good EMI filter in front my balanced transformer could still make more help. Anybody has more experiences? I'm looking for the best power line treatment solutions. All suggestions are welcome.

Regards,
Ian
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Old 13th November 2019, 11:26 PM   #1077
misterdog is offline misterdog  United Kingdom
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I use a balanced mains transformer, DC blocker first.

Group buy: DCT03 DC trap (filter) for toroidal transformers

Both made a reasonable difference.
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Old 14th November 2019, 12:41 AM   #1078
Markw4 is offline Markw4  United States
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There was some discussion and the schematics for Monster HTPS 7000 MkII power conditioners in the Blowtorch thread not long ago. They work great, but possibly can't handle the current requirements of Ian's huge power amps. Maybe the next best thing to a regenerator. Maybe better in some ways than a regenerator too since the big CM filters on each output leg prevent ground loops forming around audio interconnection signal cables and back though power cables for various audio devices. At my place there is one for the stereo and one for the test bench to clean up power noise and ground loops. Then no audio coupling transformers are needed and distortion should go down because of that.

First post with the schematics is at: John Curl's Blowtorch preamplifier part III There is a bit more over the next few pages. Its worth reading.

Only place to get them now is ebay, and you only want the MkII version. Sometimes new ones still in an unopened box pop up. Around $500, but worth it. Highly recommended.

Last edited by Markw4; 14th November 2019 at 12:46 AM.
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Old 14th November 2019, 07:05 AM   #1079
bisesik is offline bisesik  Kazakhstan
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IanCanada's Latest RPi GB Goodies Impressions... and your tweaks, mods and hints...
Hi Ian! Thanks for review
Ian, it is really very important task - how to get the clean AC power? In my case I use EATON MX5000 (it is regenerator+UPS in one chassis, in one BIG HEAVYWEIGHTED chassis on the roof) for powering my house, and after that for audio system again the regenerator PS-Audio P10. Actually there is no need to use both of them, but it is hard to running around the house and trying to persuade everyone to sit in the dark while I listen to music So two regenerators in series connection - just my case. If to describe briefly the difference between wall outlet and Regenerator - listening through the keyhole versus entering to the hall. I see that the main problem of using the transformers and even more so "grounding boxes" - they can not do anything with distorted shape of the main sine curve caused by unsimmetrical load from the city. You simply can not impact to megawatts of city energy, sitting infront of wall outlet in your room . Ian you can easily check the shape of sine after or\and before your piggy-transformer (looks like he can not wait to say "oink-oink" - cute ) or even FFT with simple step down transformer - say, with turns ratio of 230:1 - direct to the sound card input, for example.
I have no such melomanic music room at my house and oftenly testing my stuff at my friend' house, and the results of using the regenerators are pretty the same in terms of impact to the SQ.

YouTube

But seems it is possible to use less expensive regenerators than especially designed for audio. Something similar to this stabilizer should make very similar work I believe: Стабилизаторы <<ИнСтаб>> 5000–12000 ВА (настенное исполнение) - купить на сайте официального производителя
Actually it is the AC REGENERATOR. But you forced to sell them below $1000 (for 12kW) if you call it as regular stabilizer instead of magic REGENERATOR

I heard the junior model with DAC (IS350) - the effect was the same as with PSAudio regenerator.
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Old 14th November 2019, 01:37 PM   #1080
Terry Demol is offline Terry Demol  Australia
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Quote:
Originally Posted by Markw4 View Post
There was some discussion and the schematics for Monster HTPS 7000 MkII power conditioners in the Blowtorch thread not long ago. They work great, but possibly can't handle the current requirements of Ian's huge power amps. Maybe the next best thing to a regenerator. Maybe better in some ways than a regenerator too since the big CM filters on each output leg prevent ground loops forming around audio interconnection signal cables and back though power cables for various audio devices.
CM filters (chokes) on power lines will do nothing to prevent ground
loops forming.

Balanced power can help reduce induced hum / noise in existing ground
loops by reducing the fields.

I always prefer just running balanced audio wherever possible. XLR Pin 1 to
chassis, not audio ground.

TCD
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