@erik_squires nailed the purposes of a preamp and, while preamps may be vestigial, the impedance advantages they offer, not gain, are likely the reason for the improvements that some report hearing compared to driving their power amplifiers directly from a digital device.
Eliminated my preamp with amazing results
I pulled my preamp out completely. The result's were not subtle.
For those who stream music only... I was going from my laptop... to my DAC...to my preamp...to my amp. My preamps ONLY function was volume control. Source control not needed.
I started using Audirvana recently which comes with it's own high quality 64 bit volume control that was far better than the potentiometer in my preamp. It dawned on me that I could control volume using Audirvana and plug my DAC directly into the amp and bypass the preamp altogether. (Roon and Jriver also have excellent volume controllers) Note: Audirvana has an app download on a tablet/phone so it acts like a remote control. I'm loving it!
This not only eliminated the preamps volume control but it took out ALL the electronics associated in a preamp including some cables. A FAR more direct route. However, you must use caution and make sure the volume is controlled properly in the software since the amp will be fed wide open volume.
Having experimented with 'passive' preamps in the past (McCormack TLC-1) I thought the sound would possibly lose dynamics and bass response would suffer. WRONG!
The results were...Shocking!! Immediately the extended depth of the image was noticeably deeper. Background darker. The highs are the best I've ever heard. Pristine. The bass was dynamic, tight and most of all 'textured' in a way I never heard before. As I stated earlier the results are NOT subtle!
This is an experiment that took a few minutes to set up and yielded the best performance improvement of ANY other tweak I've ever tried. Not anything like using a passive preamp.
Equipment used... Peachtree DAC-itx.
Preamps...McCormack TLC-1 and Melos tube preamp.
Amp is McCormack DNA 0.5
Understand that different components will have different interactions with each other. Your results may vary. However, IF you don't like it, it takes just a few minutes to put the preamp back in the system. Nothing to lose and lot's to gain. After hearing this, I will NEVER go back to using a preamp.
Good luck!
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Harrison Labs 12 dB RCA Line Level Audio Attenuator Pair
Like erik_squires said you need to be cognizant of impedance matching. I believe tube amps like 10-20K volume pots while solid state like 50/100K. There are different kinds of passive pre’s and each can sound different. Digital, passives like Alps volume pot, Luminous Audio, and Light Speed. |
- 128 posts total