The BMU Bandits

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Ithilstone
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Re: The BMU Bandits

Unread post by Ithilstone » Fri Jul 12, 2019 12:42 pm

TheMadMick wrote:
Thu Jul 11, 2019 4:13 pm

It arrived a few days ago. I ordered the 3kVA one as the kW550 pulls nearly 20A transiently on start up. Probably overkill but it also has no fuses being wired straight into the supply lead. I also took the late Doc's advice and wired in a Schuko socket to get rid of the fuse in the plug.

The wiring diagramme on the web page is a bit confusing (probably my age?) but once I got that sorted it was quite simple. Be aware that the glands seem to be sized for PVC/PVC SWA cable. However a bit of creative thinking got round that.

First impressions - I was a little disappointed when the BMU buzzed a little but that stopped quite quickly. On playing a couple of tracks, I found the bass much better defined and much more articulate. Not sure if it's the DC blocker or the Schuko plug & socket. Personally, I don't care. Hope it continues.

At least the DC blocker seems to have stopped the buzzing. Not that it annoyed but I figure it can't be good for the transformer and another BMU is not on the cards.

Hope this is informative. :grin: :grin: :grin:
Can you post a link as I do not see one with description of 3kVA
also some photos of wiring would be appreciated - and generally some photos of finished unit ;]]
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Fretless
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Re: The BMU Bandits

Unread post by Fretless » Fri Jul 12, 2019 1:11 pm

Image

Image

Image
Main: NVA: P50sa - SSP - A40 - LS6 - Cube2 - BMU
Pi: Allo DigiOne Signature/Volumio/Tomanek LPSU/Jitterbug
DAC: Metrum Acoustics Musette CD Transport: Cambridge CXC
Headphones: AudioQuest NightHawk Carbon Amp: Schiit Magni-3
DAC: Musical Fidelity M1DAC Digital i/c: Profigold Oxypure OCC

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Fretless
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Re: The BMU Bandits

Unread post by Fretless » Fri Jul 12, 2019 1:14 pm

That is the standard version. The high power model is here:

https://www.atlhifi.com/shop/fully-asse ... d-in-case/
Main: NVA: P50sa - SSP - A40 - LS6 - Cube2 - BMU
Pi: Allo DigiOne Signature/Volumio/Tomanek LPSU/Jitterbug
DAC: Metrum Acoustics Musette CD Transport: Cambridge CXC
Headphones: AudioQuest NightHawk Carbon Amp: Schiit Magni-3
DAC: Musical Fidelity M1DAC Digital i/c: Profigold Oxypure OCC

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Ithilstone
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Re: The BMU Bandits

Unread post by Ithilstone » Fri Jul 12, 2019 2:02 pm

Thank you Fretless
That's the massive jump in price - not sure if it is needed when combined with NVA BMU
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Docfoster
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Re: The BMU Bandits

Unread post by Docfoster » Fri Jul 12, 2019 5:11 pm

TheMadMick wrote:
Thu Jul 11, 2019 4:13 pm
On playing a couple of tracks, I found the bass much better defined and much more articulate. Not sure if it's the DC blocker or the Schuko plug & socket. Personally, I don't care. Hope it continues.
Concurs with my own experience of using a DC blocker with a balanced mains supply (no Schukos).
System 1: JRiver MC24 > Dell Latitude 7270 > Asus Xonar Essence One Muses Edition > One4 Class A power amp (with Dynamic PSU boards) > DIY 3 ways (based around Goodmans 18P woofers)
LC Audio Technology mains DC filter > Sovereign MTBPS balanced power supply
TQ (Wonfor) Ultra Black speaker cables and interconnects.

System 2: Anything with a headphone socket > Inca Tech Claymore > Reworked Goodmans Magisters

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TheMadMick
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Re: The BMU Bandits

Unread post by TheMadMick » Fri Jul 12, 2019 10:08 pm

Docfoster wrote:
Fri Jul 12, 2019 5:11 pm
TheMadMick wrote:
Thu Jul 11, 2019 4:13 pm
On playing a couple of tracks, I found the bass much better defined and much more articulate. Not sure if it's the DC blocker or the Schuko plug & socket. Personally, I don't care. Hope it continues.
Concurs with my own experience of using a DC blocker with a balanced mains supply (no Schukos).
That's what I find odd. All the pundits said there should be no effect. I had difficulty in seeing that. However, if anything, I expected a reduction in relatively high frequency hash - and that happened to a certain extent. However, the bass improvement was a bit of a (pleasant) surprise.

There you go. Funny the things that happen in this hobby.
NuVista 3D, kW550, MA PL200, BMU, Atlas Mavros, Blusound Vault.

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Fretless
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Re: The BMU Bandits

Unread post by Fretless » Fri Jul 12, 2019 10:16 pm

I was one of the great unwashed who thought that mains was mains and wouldn't make any difference to the performance of an audio system.
Now I begin to realise that it does.

Same thing happened to me with cables; 'why bother - it's only bits of wire and the sound is made by the things in boxes'.

:angry-banghead: :angry-banghead: :angry-banghead:
Main: NVA: P50sa - SSP - A40 - LS6 - Cube2 - BMU
Pi: Allo DigiOne Signature/Volumio/Tomanek LPSU/Jitterbug
DAC: Metrum Acoustics Musette CD Transport: Cambridge CXC
Headphones: AudioQuest NightHawk Carbon Amp: Schiit Magni-3
DAC: Musical Fidelity M1DAC Digital i/c: Profigold Oxypure OCC

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Fretless
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Re: The BMU Bandits

Unread post by Fretless » Sat Jul 20, 2019 10:37 am

Image

The DC Blocker is the little thing in the corner, dwarfed by thr BMU.

I have immediately noticed an improved sense of overall control, rock-solid stability and a sharper edge on fine detail in the soundstage. Now there is a new, intensely crystalline focus.

As for bass. The subsonic effects present in Laurie Anderson's 'Gravity's Angel' have never been more earthshakingly audible.

Remarkable.
Main: NVA: P50sa - SSP - A40 - LS6 - Cube2 - BMU
Pi: Allo DigiOne Signature/Volumio/Tomanek LPSU/Jitterbug
DAC: Metrum Acoustics Musette CD Transport: Cambridge CXC
Headphones: AudioQuest NightHawk Carbon Amp: Schiit Magni-3
DAC: Musical Fidelity M1DAC Digital i/c: Profigold Oxypure OCC

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