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Question About Luminous Audio Passive Preamp


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Hello:

 

Seeking some advice. I hope I'm in the right place.

 

I started experimenting with Computer Audiophile sources and components (albeit MODEST) over the last 7 to 10 years.

 

I currently have  JRiver Media Center 27 on a Windows 10 64 bit system. 

 

That signal goes to an HRT Streamer HD>NHT Passive Volume Control>KRK Rokit8 sub>ADAM audio T7V powered studio monitors.

 

I want to use the HRT's balanced outputs, and balanced connections, exclusively, so that will require a different Passive Volume Control/Passive preamp.

 

I was looking at the Luminous Audio Axiom Mark II and a much cheaper version with balanced ins and outs from Nobsound.

 

My question is, is it worth spending 300 dollars on a passive preamp like the Axiom, or will the Nobsound suffice?

 

If it would make the difference in sound quality, this final tweak could be worth it, but for my relatively modest system, I'm wondering if it would be overkill.

 

Thanks for any input.

 

 

 

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2 hours ago, samtheman57 said:

Hello:

 

Seeking some advice. I hope I'm in the right place.

 

I started experimenting with Computer Audiophile sources and components (albeit MODEST) over the last 7 to 10 years.

 

I currently have  JRiver Media Center 27 on a Windows 10 64 bit system. 

 

That signal goes to an HRT Streamer HD>NHT Passive Volume Control>KRK Rokit8 sub>ADAM audio T7V powered studio monitors.

 

I want to use the HRT's balanced outputs, and balanced connections, exclusively, so that will require a different Passive Volume Control/Passive preamp.

 

I was looking at the Luminous Audio Axiom Mark II and a much cheaper version with balanced ins and outs from Nobsound.

 

My question is, is it worth spending 300 dollars on a passive preamp like the Axiom, or will the Nobsound suffice?

 

If it would make the difference in sound quality, this final tweak could be worth it, but for my relatively modest system, I'm wondering if it would be overkill.

 

Thanks for any input.

 

 

 

A $49 Schiit pre is doing just fine in my setup. Worry more about getting keeper interconnects, the Kimber Hero RCA's are a safe purchase. From all

the reading I've done, balanced cable benefits required a more expensive system to hear and a lot of good gear doesn't have XLR jacks. I plan to go

to an Axiom or better passive pre in the future but don't see the need until  i've put another $7k into DAC and amplification

Regards,

Dave

 

Audio system

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42 minutes ago, davide256 said:

A $49 Schiit pre is doing just fine in my setup. Worry more about getting keeper interconnects, the Kimber Hero RCA's are a safe purchase. From all

the reading I've done, balanced cable benefits required a more expensive system to hear and a lot of good gear doesn't have XLR jacks. I plan to go

to an Axiom or better passive pre in the future but don't see the need until  i've put another $7k into DAC and amplification

Sorry, should have included that the Schiit pre is the passive Sys

Regards,

Dave

 

Audio system

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I pulled the trigger a couple of days ago after doing some additional research and reading. Again, for the use of balanced connections from the HRT, and the balanced inputs and outputs on the KRK sub and ADAM T7Vs. This is the first tine where all the components have balanced inputs and outputs. Another issue is that, after isolating the USB DAC to a seperate, powered hub, and putting the speakers on a seperate circuit I still hear faint but perceptible "artifacts" when the volume on my current NHT Passive Volume Control is maxed with no signal is coming through the chain. It's been driving me a bit nuts. Hoping this will help, but it's not a major issue. I'll report back once I get the Luminous.

 

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The Axiom passive line controller is a very transparent unit that doesn't hog a lot of space on your rack or desktop. It will clearly pass on what your source transmits. If you don't need inputs for a large number of sources, than it certainly is worth auditioning > then likely owning. I auditioned it, but at the time needed a couple additional inputs. Last time I looked they offered a few different levels of the Axiom, but even the least expense was built around very good sounding ALPS pots and nice connectors. The great thing about Luminous Audio is the owner is an enthusiast, willing to take the time to help you select the right unit (or customize) to meet the needs of your source & amp. I've had a few of their cables, RCA & speaker, in my system over the years.👍

Server: Mac Mini 3.2GHz-i7, 512Gb - 16Gb macOS 10.15.x & Audirvana 3.5.x  DAC: -  Linestage: - Amp: -  Speakers: - 

 

When you're racing... it's Life. Anything that happens before or after, it's just waiting.
- Steve McQueen, Le Mans

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OK looking for further help here.

 

In order to get this preamp in my hot little hands, I am going to have to answer certain questions.

 

I tried numerous messages detailing my setup, but I'm not an audio engineer, and I feel like I have to pass a test where I have no knowledge or background.

 

I have an HRT Streamer HD as a source, which feeds a KRK 8s sub, ,which then feeds Two ADAM T7V monitors.

 

All I can do is relay these stats:

 

 HRT USB DAC:

Full Scale Output 2.25 V RMS (RCA), 4.5V (XLR)
Output Impedance 50 Ohm (RCA), 50+50 Ohm (XLR)
Frequency Response (20 Hz/20 kHz) -0 dB / -.2 dB
Noise Floor (DC to 30 kHz) 5 uV RMS (RCA), 9 uV (XLR)
S/N Ratio (DC to 30 kHz) 113 dB (RCA), 114 dB (XLR)
S/N Ratio (A-weighted) 119 dB (RCA), 122 dB (XLR)
THD+N (1 kHz Full Scale) .002%
THD+N (1 kHz -20dB) .0002%
Jitter Contribution (DC to 30 kHz) >144 dB below full scale
Isolation > 500M ohm
Sample Rate up to 192 kHz
Bit Depth up to 24 bit
USB Transfer Protocol asynchronous
Power Requirements (USB Buss) 480 mA

KRK 8S Sub:Powered: Yes
Speaker Size: 8"
Driver Type: Glass Aramid Composite cone
Total Power : 109W Class D
Frequency Range: 30Hz-205Hz
Crossover Frequency: Variable - 70Hz/80Hz/90Hz/100Hz
Maximum Peak SPL: 112.8dB
--------------------------------------------------------------------------------------
ADAM Audio T7V Monitors:
U-ART 1.9†Accelerated Ribbon Tweeter with HPS Waveguide

Polypropylene 7†woofer and rear-firing bass-reflex port

Cumulated Amp. Power RMS: 70 W

Frequency Response: 39 Hz - 25 kHz

Max. SPL Per Pair at 1 m: ≥110 dB

So after sending all this a week ago through E Bay,Tim said he was out of the office this morning in an e mail and he needed to know  : I REALLY need info on your amp and spks. Spk effic in db/watt. Amp's input imp. and sensitivity. Please, Tim                                                               

So, is ANY of the above sufficient information, or am I still not getting him what he needs?

 

Never worked so hard to buy something in my life.

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On 2/20/2021 at 12:38 PM, Martini said:

The Axiom passive line controller is a very transparent unit that doesn't hog a lot of space on your rack or desktop. It will clearly pass on what your source transmits. If you don't need inputs for a large number of sources, than it certainly is worth auditioning > then likely owning. I auditioned it, but at the time needed a couple additional inputs. Last time I looked they offered a few different levels of the Axiom, but even the least expense was built around very good sounding ALPS pots and nice connectors. The great thing about Luminous Audio is the owner is an enthusiast, willing to take the time to help you select the right unit (or customize) to meet the needs of your source & amp. I've had a few of their cables, RCA & speaker, in my system over the years.👍

Thanks for your input on this Martini. I'm having some issues getting information to him (see post above) Appreciate your thoughts.

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1 hour ago, samtheman57 said:

OK looking for further help here.

 

In order to get this preamp in my hot little hands, I am going to have to answer certain questions.

 

I tried numerous messages detailing my setup, but I'm not an audio engineer, and I feel like I have to pass a test where I have no knowledge or background.

 

I have an HRT Streamer HD as a source, which feeds a KRK 8s sub, ,which then feeds Two ADAM T7V monitors.

 

All I can do is relay these stats:

 

 HRT USB DAC:

Full Scale Output 2.25 V RMS (RCA), 4.5V (XLR)
Output Impedance 50 Ohm (RCA), 50+50 Ohm (XLR)
Frequency Response (20 Hz/20 kHz) -0 dB / -.2 dB
Noise Floor (DC to 30 kHz) 5 uV RMS (RCA), 9 uV (XLR)
S/N Ratio (DC to 30 kHz) 113 dB (RCA), 114 dB (XLR)
S/N Ratio (A-weighted) 119 dB (RCA), 122 dB (XLR)
THD+N (1 kHz Full Scale) .002%
THD+N (1 kHz -20dB) .0002%
Jitter Contribution (DC to 30 kHz) >144 dB below full scale
Isolation > 500M ohm
Sample Rate up to 192 kHz
Bit Depth up to 24 bit
USB Transfer Protocol asynchronous
Power Requirements (USB Buss) 480 mA

KRK 8S Sub:Powered: Yes
Speaker Size: 8"
Driver Type: Glass Aramid Composite cone
Total Power : 109W Class D
Frequency Range: 30Hz-205Hz
Crossover Frequency: Variable - 70Hz/80Hz/90Hz/100Hz
Maximum Peak SPL: 112.8dB
--------------------------------------------------------------------------------------
ADAM Audio T7V Monitors:
U-ART 1.9†Accelerated Ribbon Tweeter with HPS Waveguide

Polypropylene 7†woofer and rear-firing bass-reflex port

Cumulated Amp. Power RMS: 70 W

Frequency Response: 39 Hz - 25 kHz

Max. SPL Per Pair at 1 m: ≥110 dB

So after sending all this a week ago through E Bay,Tim said he was out of the office this morning in an e mail and he needed to know  : I REALLY need info on your amp and spks. Spk effic in db/watt. Amp's input imp. and sensitivity. Please, Tim                                                               

So, is ANY of the above sufficient information, or am I still not getting him what he needs?

 

Never worked so hard to buy something in my life.

On 2/20/2021 at 12:38 PM, Martini said:

The Axiom passive line controller is a very transparent unit that doesn't hog a lot of space on your rack or desktop. It will clearly pass on what your source transmits. If you don't need inputs for a large number of sources, than it certainly is worth auditioning > then likely owning. I auditioned it, but at the time needed a couple additional inputs. Last time I looked they offered a few different levels of the Axiom, but even the least expense was built around very good sounding ALPS pots and nice connectors. The great thing about Luminous Audio is the owner is an enthusiast, willing to take the time to help you select the right unit (or customize) to meet the needs of your source & amp. I've had a few of their cables, RCA & speaker, in my system over the years.👍

Thanks for your input on this Martini. I'm having some issues getting information to him (see post above) Appreciate your thoughts.

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OK, Tim just contacted me and said he has what he needs with above info.

 

I will get back on the differences, if any between balanced and unbalanced connections, although it may be subjective.

 

I like that this preamp can be modded for upgrades.

 

 

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