Grimm Audio MU1 and MU2 Music Players

[PYP]

2 hours ago, Ronnie112 said:

we are on a different voltage here in Europe 🤣

My renewable source.  Grounding the wheel solves the issue of static buildup.

[Nicholas Dong]

Since the last firmware update 1.51, it has not been updated for 5 months. The expected firmware for other playback protocols has not arrived. Is Eelco encountering any problems?

[Eelco Grimm]

@Nicholas Dong The next firmware update is a _huge_ amount of work since we write most of the code ourselves. And we prefer to do it right the first time. Please remain patient for a few months. It will be very much worth the wait...

[aangen]

I spent a lot of time convincing a friend to get an MU1. He went on forever about I should I Should I SHOULD! He had the MU1 for two days an he immediately placed an order for an MU2. Now I am jealous.

[Nicholas Dong]

On 6/25/2023 at 5:59 PM, Eelco Grimm said:

@Nicholas Dong The next firmware update is a _huge_ amount of work since we write most of the code ourselves. And we prefer to do it right the first time. Please remain patient for a few months. It will be very much worth the wait...

Well, if I could play music without Roon, I'd wait a few more months, thanks to Eelco

[fuzzypoodle]

Hi, how difficult is it to install an internal SSD and enable it in software ? Thanks.

[aangen]

Do they sell an MU1 without a drive in it?

[TheAttorney]

12 hours ago, fuzzypoodle said:

Hi, how difficult is it to install an internal SSD and enable it in software ? Thanks.

The MU1wasn't designed to enable user-installable SSDs.

From memory of an older post, it's only viable if you are computer literate and Eelco agrees to supply the appropriate instructions and specific SSD models supported.

 

When I bought my MU1, it was possible to order it without an internal SSD, but IMO it would be unwise to ever not include the SSD - for future flexibility and salability.

[fuzzypoodle]

OK. Thanks. I will try to avoid a diskless units then ;-) .... 

[Low325]

You can send them in but pay a fee from Grimm I think? 

[aangen]

I have so many DACs already!
 

I just assumed because of this I could choose to not get involved with the MU2. But what I am reading makes that seem incorrect. Now it seems like I will soon have yet another DAC. Moohaha!

[PYP]

6 hours ago, aangen said:

I have so many DACs already!
 

I just assumed because of this I could choose to not get involved with the MU2. But what I am reading makes that seem incorrect. Now it seems like I will soon have yet another DAC. Moohaha!

will be very interesting to read about what you hear and any comparisons to your other two DACs.  

[Terrycwk]

Hello everyone, new MU1 owner here in Vancouver Canada.

 

Just wanna see if other users notice the fuse rating inside the unit is different from what it says in the user manual?  I’m waiting for a reply from the dealer now.

 

1.  200mA Fast blow (worldwide it says) in user manual

2.  630mA Fast blow in actual MU1 fuse tray.

 

It’s quite surprising to find that out.

[TheAttorney]

14 hours ago, Terrycwk said:

Just wanna see if other users notice the fuse rating inside the unit is different from what it says in the user manual?  I’m waiting for a reply from the dealer now.

 

1.  200mA Fast blow (worldwide it says) in user manual

2.  630mA Fast blow in actual MU1 fuse tray.

My UK-supplied MU1 has Fast Blow 630mA. I think the 200mA must be a typo.

 

I'm surprised it's Fast Blow though. Most mains fuses are Slow Blow to handle switch-on surge. Grimm must be particularly concerned about transients on the mains supply, as they also have that little button on the back for a two-stage power up or down.

[Terrycwk]

2 hours ago, TheAttorney said:

My UK-supplied MU1 has Fast Blow 630mA. I think the 200mA must be a typo.

 

I'm surprised it's Fast Blow though. Most mains fuses are Slow Blow to handle switch-on surge. Grimm must be particularly concerned about transients on the mains supply, as they also have that little button on the back for a two-stage power up or down.

Thanks TheAttorney!  I’m still waiting for the dealer to give me a reply on this question so will wait and see.  There’s actually a Grimm user group on FB and I do plan to post the question later on.

[Terrycwk]

12 hours ago, TheAttorney said:

My UK-supplied MU1 has Fast Blow 630mA. I think the 200mA must be a typo.

 

I'm surprised it's Fast Blow though. Most mains fuses are Slow Blow to handle switch-on surge. Grimm must be particularly concerned about transients on the mains supply, as they also have that little button on the back for a two-stage power up or down.

May I ask if you have changed the fuse?  If yes I suppose it would be F630mA right?

[TheAttorney]

5 hours ago, Terrycwk said:

May I ask if you have changed the fuse?  If yes I suppose it would be F630mA right?

Yes, I replaced it with an SR Orange, and yes this was worth it for improved SQ.

 

I had a spare SR Orange that was rated slightly higher than 630mA, which is a slight risk I'm prepared to take as a temporary measure, as the SR's have a reputation for premature failure at the recommended rating. I'm waiting to see the recommended rating for MU2 before making any other fuse changes. With the extra circuitry, the MU2 could well have a higher rated fuse.

[Terrycwk]

15 hours ago, TheAttorney said:

Yes, I replaced it with an SR Orange, and yes this was worth it for improved SQ.

 

I had a spare SR Orange that was rated slightly higher than 630mA, which is a slight risk I'm prepared to take as a temporary measure, as the SR's have a reputation for premature failure at the recommended rating. I'm waiting to see the recommended rating for MU2 before making any other fuse changes. With the extra circuitry, the MU2 could well have a higher rated fuse.

Many thanks again!  Hopefully I will get a reply from the dealer soon on why the discrepancies.

[aangen]

Any updates on what the proper fuse value is? I have an inkling that Eelco probably doesn’t believe a fuse or a power cable impact the MU1 much. This seems pretty typical with most audio manufacturers. But I have positive experiences with fuses, power cables and interconnects in my system. I wouldn’t be shy to trying a fuse upgrade.

[Ronnie112]

4 hours ago, aangen said:

Any updates on what the proper fuse value is? I have an inkling that Eelco probably doesn’t believe a fuse or a power cable impact the MU1 much. This seems pretty typical with most audio manufacturers. But I have positive experiences with fuses, power cables and interconnects in my system. I wouldn’t be shy to trying a fuse upgrade.

In mine it is 630mA, so assuming that is the proper value. And although the electrical design of the Grimm MU1 makes it less immune to its surroundings compared to others, it does benefit from better fuses and powercords in my experience. Replacing the fuse with the Synergistic Purple fuse improved resolution and openness of the soundstage as well as slightly better dynamics. I'm inclined to go for one of those new Master fuses, but waiting for the fuse rating of the MU2 before I place my order. 

[Terrycwk]

5 hours ago, aangen said:

Any updates on what the proper fuse value is? I have an inkling that Eelco probably doesn’t believe a fuse or a power cable impact the MU1 much. This seems pretty typical with most audio manufacturers. But I have positive experiences with fuses, power cables and interconnects in my system. I wouldn’t be shy to trying a fuse upgrade.

As per message from a dealer in another forum the F630mA is the correct one and somehow the numbers are misprinted.  As many other users are using the F630mA, I’m just gonna follow the queue and get it replaced lol.

[Rafcam]

On 9/19/2022 at 4:47 PM, Stevem324 said:

I just ordered a MU1 to replace my ancient Bryston BDP-2.  I'll be using it my Bricasti M1SE.  I had my Bryston connected with an ethernet cable directly to my Netgear Mesh wifi booster.  I was thinking of getting a network switch to put between the wifi booster and the MU1.  Would it be beneficial to get a network switch for this application?  I was thinking of getting a Innous PhoenixNet, Melco, or SOTM switch but I don't want to waste my money if it's not going to make a major impact due the MU1's excellent noise rejection.  Would I be better off going direct from the wifi booster to the MU1 and putting my money into a very good AES cable and power cords?  Also I'm looking for suggestions for a good AES cable without breaking the bank.  I was thinking of getting a Triode Wire Labs AES cable.  Anyone have experience with that cable.  I've also had good experience with Revelation Audio Labs digital cables.

 

I'm not new to network switches and the audio SQ benefits that they provide.  In my basement system, I have a Etherregen, external After Dark OCXO clock, and Sonore Optical Module Deluxe with LPS for all of these components.  My streamer in this system is an Aurender W20SE connected to a May KTE. In this system, I have my main router ethernet wired to the Sonore OMD and fiber optic to the ER.

Thanks in advance for advice!

 

 

 

Any comments on difference in SQ between your BDP 2 and MU 1? I have a BDP 3 and am considering replacing it with an MU 1.

[Vincent des Champs]

On 8/5/2023 at 5:14 PM, Terrycwk said:

As per message from a dealer in another forum the F630mA is the correct one and somehow the numbers are misprinted.  As many other users are using the F630mA, I’m just gonna follow the queue and get it replaced lol.

@Eelco Grimm could you please confirm that 630 mA FB is the right fuse value/type?

 

Thanks!

[FredM]

F630mA is correct, Eelco responded the question on Facebook (Grimm Audio User Group)

 

 

[PYP]

article about Grimm Audio:

 

https://audioxpress.com/article/grimm-audio-building-the-dream