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Modulus-86  build thread
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Old 3rd February 2018, 05:07 PM   #3851
zgtc is offline zgtc
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Originally Posted by tomchr View Post
I'm currently using two RS-600-36 for the testing. Those are great in the lab but their fans are super loud. The RPS-400-series does not have a fan.
Not what I'm reading in the RPS-400 or even RPS-300 datasheets
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Old 3rd February 2018, 05:10 PM   #3852
zgtc is offline zgtc
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Not what I'm reading in the RPS-400 or even RPS-300 datasheets
OK sorry, my mistake, fans are optional, only TF/-SF series come with fans installed.
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Old 3rd February 2018, 05:29 PM   #3853
Studley is offline Studley  United Kingdom
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Default SMPS

Thanks for that Tom. Think I'll give the SMPS a go. You once advised me that it was a bad idea to put a power amps linear PS in a separate enclosure. Does that also apply to a SMPS?
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Old 3rd February 2018, 08:53 PM   #3854
tomchr is offline tomchr  Canada
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Originally Posted by zgtc View Post
OK sorry, my mistake, fans are optional, only TF/-SF series come with fans installed.
Correct. Also note that the "400 W" RPS-400-series will only deliver 400 W when fan cooled. At natural convection, it becomes a 250 W supply. I'm thinking that for audio use, that's just fine, though. Due to the crest factor of music, a fan will not be needed.

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Originally Posted by Studley View Post
Thanks for that Tom. Think I'll give the SMPS a go. You once advised me that it was a bad idea to put a power amps linear PS in a separate enclosure. Does that also apply to a SMPS?
Yep. The problem with umbilical cords is the added impedance of the cord and the pulse currents flowing in the cord. The cord is the problem. Not the supply feeding the cord.

Tom
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MOD686: Up to 240W/8Ω, <0.00025% THD. MOD86: 40W/8Ω, 0.000054% THD. HP-1: 3W/20Ω, -130dBc THD, 128dB DNR.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 4th February 2018, 05:24 AM   #3855
tomchr is offline tomchr  Canada
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Modulus-686 Vendor Thread: Modulus-686: 380W (4Ω); 220W (8Ω) Balanced Composite Power Amp with extremely low THD
Let's continue the MOD686-related discussions there.

I've updated my website to include the MOD686 as well: Neurochrome :: Modulus-686 :: 220W (8Ω); 380W (4Ω) @ 0.00026% THD+N.
I will flesh out the page some more once the first samples of the professionally assembled boards arrive.

...and am now accepting pre-orders: Modulus-686 Order Page

I'm trying a new measurement: 1 kHz + 5.5 kHz IMD. Siegfried Linkwitz seems to advocate for this measurement as in his experience it correlates especially well with the perceived listening experience. It is worth noting that the MOD686 performs 20-30 dB better than the best amps listed on his website: Amplifier Distortion
Note: I used 917 Hz + 5.5 kHz due to a limitation in the APx525 signal source.

Thanks,

Tom
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File Type: png Modulus-686 PROTO_ IMD 917 Hz + 5.5 kHz @ 1 W, 8 ohm.png (39.6 KB, 499 views)
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MOD686: Up to 240W/8Ω, <0.00025% THD. MOD86: 40W/8Ω, 0.000054% THD. HP-1: 3W/20Ω, -130dBc THD, 128dB DNR.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right

Last edited by tomchr; 4th February 2018 at 05:27 AM.
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Old 4th February 2018, 06:43 PM   #3856
HammerSandwich is offline HammerSandwich
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Quote:
Originally Posted by tomchr View Post
I'm trying a new measurement: 1 kHz + 5.5 kHz IMD. Siegfried Linkwitz seems to advocate for this measurement as in his experience it correlates especially well with the perceived listening experience. It is worth noting that the MOD686 performs 20-30 dB better than the best amps listed on his website: Amplifier Distortion
FYI, Linkwitz added a couple more to the LXMini's Amp page, but the 686 still beats them all. VERY impressive results, Tom!

People who are skeptical about SMPS perfomance, please note that the ATI Ncore's performance there seems to be limited by its linear power supply.
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Old 4th February 2018, 10:12 PM   #3857
soongsc is offline soongsc  Taiwan
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I had listened to the LXmini’s in Sea Ranch. Sounded a bit harsh and fatiguing, Siegfried attributes it to the cheap electronics. The larger system sounded more closer to my normally listening but with better bass performance. I am planning to get the MiniDSP 2x4HD this year, but using FIR filters to linearize the phase.
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Old 11th February 2018, 06:17 PM   #3858
sercan85 is offline sercan85
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Default My modulus86

Modulus-86  build thread
Modulus-86  build thread

Modulus-86  build thread

Modulus-86  build thread

Dear diyaudio friends
Finally i finish my modulus86. Firstly i would like to thanks toTom.
I buy pcb andi start. You know all process. I use all inner cables OCC. Signal lines and speaker lines are furutech alpha series occ.. dc voltage and 220vac line cables are elecaudio 2.5mm wire... my input connectors are neutrik xlr, my binding posts are WBT cu/gold. Transformers hammond 120VA 2x22vac. I made soft start with emi filter and speaker delay. My amp is dual mono L and R channel gnd not connect each other. I like dual mono desing ... my dac is es9028pro and it has on iv ad797 (diyinhk board and dimitris software) my player cubox i 4x4 and volumio. My speaker are sonus faber venere 2.5 and all cables are furutech alpha series occ (xlr,speakerand power chords and usb). My dac and modulus86 are so much good couple. They are amazing...my friends and i are schock, so much clear and transparent sound detail and vision perfect.. we dont want stop music. Thanks everyone
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Old 11th February 2018, 06:32 PM   #3859
sq225917 is offline sq225917  United Kingdom
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Finally getting round to bridging my Mod86p.

Click the image to open in full size.
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Old 11th February 2018, 09:04 PM   #3860
asuslover is offline asuslover  Romania
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Modulus-86  build thread
sercan85, love your finished amplifier!
sq225917 , love those parallel86! I have a couple of them and I have no complains!
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