Relay Attenuator, another Allo game changer

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Relay Attenuator, another Allo game changer

Postby jazz » Tue Sep 12 2017 21:27

Hi

Allo has done it again: when you believe your system already sounds good enough, and you can sit back and enjoy the music quietly you see that Volumio has implemented a plugin for Relay Attenuator. So you buy this new device because in a message from this forum Allo said that I needed one.

The first thing you need to know is that if you use the Volumio volume control, you are missing things because only 100% of volume you will have all the bits (sure the experts will be able to explain this better than me), but even if you use a preamplifier, Relay does the different things with the volume.

The testing team:
-Raspberry Pi 3 powered with linear power supply, Allo isolator with LiFePO4 batteries, Allo Boss, Relay Attenuator
-Professional speakers Neumann Kh120A and subwoofer kh805. My 18 meter room has some acoustic treatments and it sounds great. This equipment is designed to mastering, I can perceive the smallest changes.

You have to burn relay a few hours, at least 50 hours, I know what you're thinking, but without burning relay slows down the music very fast.

What I've noticed on the Relay to love it:
1. The sound of the Boss with Isolator I thought it was very analogue, but now scale, not one, but many steps to make a sound that I can not imagine more analogue, not even with a turntable, unless you spend many (many) thousands of euros.
2. The focus on the sound scene is much better, there is more separation between instruments, although the scene is not wider, compared to no Relay everything is more together and confusing. The air sounds, it's hard to explain, if you close your eyes there's space around each instrument
3. There is more detail, and I do not speak of absurd details like a breath or fingers stroking the strings, I talk about reverb, and you hear that sound in the right channel and see how now they move to the left channel to disappear (decay, I do not know if it says so and n English)
4. There is more and better bass, very good bass. This can be a bad point if you don't like Boss's bassr or think you are short of sharp. Also note that I have a great subwoofer capable of great things.
5. The Boss is very musical, the sound is very nice, as Relay multiplies this, the voices are sweet, wonderful. You can only enjoy similar with tubes.

With piano 2.1 and Relay you will have very good things, and although piano scene 2.1 is better and is more detailed, it does not have the sweetness and magic of the Boss with Relay.

And all this for a ridiculous price. I tell you what Allo said: You need a Attenuator Relay.

Remember that it is only my experience and that I do not work for Allo or have any economic interest. My only interest is that you enjoy the music as I do.

Congratulations Allo! You've done it again.

Best regards.
RPI3. Odroid C2. Allo Sparky. Allo Isolator. Allo Kali. Allo Piano 2.1. Allo Boss. Audiophonics I-TDA 1387. IFI MICRO IDSD. IFI ITUBE 2. NEUMANN KH120A NEUMANN KH805
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Re: Relay Attenuator, another Allo game changer

Postby Mair » Wed Sep 13 2017 05:47

Wow!! Beam down the attenuator Scotty

Joking aside first: do you seed an isolator first? Second: wll in fit top or under the Boss?


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Rega Elicit-R, Rega rs3, Dali Spektor 1, Raspberry Pi, Boss Dac, Relay Attentuator.
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Re: Relay Attenuator, another Allo game changer

Postby Mair » Wed Sep 13 2017 05:52

From the looks you can tell that it must be connected to the Boss and another pair of rca to the amp. Right?

And does it support Picore as well as Volumio?


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Rega Elicit-R, Rega rs3, Dali Spektor 1, Raspberry Pi, Boss Dac, Relay Attentuator.
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Relay Attenuator, another Allo game changer

Postby jazz » Wed Sep 13 2017 10:11

Hi Captain Kirk ;-) hahahaha.

You put first Rpi3, then Isolator (with much better lifepo4), after Boss and then Relay. You connect the rca to your power amplifier or amplifier to the two connectors on the right side of relay (the other two are input of another input device, but it is not as good as if you used Boss).

Right now you only can control relay with volumio without adding more hardware. If you want to use other software that add buttons, or hifiduino or IR receiver in rpi and remote controller, and install and configure more software on their Rpi. You can find the Guide on this page of Allo.

Best regards
RPI3. Odroid C2. Allo Sparky. Allo Isolator. Allo Kali. Allo Piano 2.1. Allo Boss. Audiophonics I-TDA 1387. IFI MICRO IDSD. IFI ITUBE 2. NEUMANN KH120A NEUMANN KH805
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Relay Attenuator, another Allo game changer

Postby Zleepy » Thu Sep 21 2017 07:37

Hi,

I'm new here and like so many other trying to make up my mind abouth how my first raspberry Pi and volumino based streamer+amp setup should look like. Actually It will go to my dad but I will give it a thorough try first ;) .

As I have learned that the volume control is one of the more critical components in the audio chain, I've thought about a setup with Pi3+BOSS+Relay feeding a DIY power amp without volume control. Do you more experienced guys have any comments on a setup like that?

My concern is the relay as the only volume control. I'm worried it's too easy to accidentally turn the volume too much up... How convenient is it to control the relay board via the Volumino plugin? Does it remember the volume setting from last session when powering up? Is it possible to set a max volume on the relay to elimiate any finger slips leading to blown eardrums..?

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Relay Attenuator, another Allo game changer

Postby jazz » Fri Sep 22 2017 13:22

Hi,

I use it with self-powered speakers, which is the same as using it with a power stage. It's very good for that.

You can limit the volume in the Volumio options.

The volumio plug-in volume control for me is correct, if you want more precision you will have to use hardware components.

The volume is zero when you power on, if you use volumio plug-in.

Best regards.
RPI3. Odroid C2. Allo Sparky. Allo Isolator. Allo Kali. Allo Piano 2.1. Allo Boss. Audiophonics I-TDA 1387. IFI MICRO IDSD. IFI ITUBE 2. NEUMANN KH120A NEUMANN KH805
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Relay Attenuator, another Allo game changer

Postby Zleepy » Fri Sep 22 2017 15:00

Thanks Jazz, very helpful info!

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Relay Attenuator, another Allo game changer

Postby knudsen » Wed Oct 04 2017 13:49

jazz wrote:Hi Captain Kirk ;-) hahahaha.

You put first Rpi3, then Isolator (with much better lifepo4), after Boss and then Relay. You connect the rca to your power amplifier or amplifier to the two connectors on the right side of relay (the other two are input of another input device, but it is not as good as if you used Boss).

Jazz can I ask; is it possible to have it on top of Boss, and at the same time have a second source connected to the input connectors, and if I need to hear this second source I just pause in Volumio and start the source? Also, am I wrong that the resistor principle ought to result in a higher output impedance (possibly much higher)? My power amp has a 6000ohm input impedance, so from the rule of thumb I should definetly not exceed 600ohm output impedance from the source.

Well, there must be some big holes in my understanding, as the attenuator apparently will use from 0ohm - 10kOhm. So I will exceed the rule of thumb by an order of magnitude. I guess that can't be right.. :(
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Relay Attenuator, another Allo game changer

Postby jazz » Fri Oct 06 2017 07:24

knudsen wrote:
jazz wrote:Hi Captain Kirk ;-) hahahaha.

You put first Rpi3, then Isolator (with much better lifepo4), after Boss and then Relay. You connect the rca to your power amplifier or amplifier to the two connectors on the right side of relay (the other two are input of another input device, but it is not as good as if you used Boss).

Jazz can I ask; is it possible to have it on top of Boss, and at the same time have a second source connected to the input connectors, and if I need to hear this second source I just pause in Volumio and start the source? Also, am I wrong that the resistor principle ought to result in a higher output impedance (possibly much higher)? My power amp has a 6000ohm input impedance, so from the rule of thumb I should definetly not exceed 600ohm output impedance from the source.

Well, there must be some big holes in my understanding, as the attenuator apparently will use from 0ohm - 10kOhm. So I will exceed the rule of thumb by an order of magnitude. I guess that can't be right.. :(


Hi Knudsen,

Yes, it is possible that you have a second source connected, I have not had good experience with that. I do not like the sound. Regarding the other issue, I think like you, and in this case can make the bottleneck attenuator, but I do not have enough knowledge of electronica to ensure it 100%.

Best regards
RPI3. Odroid C2. Allo Sparky. Allo Isolator. Allo Kali. Allo Piano 2.1. Allo Boss. Audiophonics I-TDA 1387. IFI MICRO IDSD. IFI ITUBE 2. NEUMANN KH120A NEUMANN KH805
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Relay Attenuator, another Allo game changer

Postby allo » Fri Oct 06 2017 08:07

Not a good idea to have both sources connected in the same time. Always use only one analog input

Regarding your AMP, the best it to ask the manufacturer what value of pot they recommend . Its actualy a bit complicated.

The AMP will see the DAC + POT in parallel . so that usually 100Ohm (dac) + 2500KOhm(1/4 of max 10k from pot) = about 99Ohm

Your DAC will see the AMP + Pot in parallel = 5.9K
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