New Firmware With Adjustable Impedance & Improved Auto-Calibration

impedance matching LDR Passive Preamplifiers With Adjustable Impedance - March 1, 2015 – Tortuga Audio has released a major firmware update for its LDR Passive Preamp product line allowing the user to change the input impedance of their LDR passive preamp. This firmware update also includes an upgraded auto-calibration algorithm resulting in improved sound stage and stereo imaging. The Adjustable Impedance feature allows the […]

What customers and reviewers are saying about our preamps logo

Owner Re-discovers Music Collection with LDR1

" I listen to a wide variety of music. I pulled out discs that I had not listened to in years and probably listened to more music, since receiving the LDR1, than I had listened to in the past 6 months. I was given a renewed sense of excitement that I had been missing for a long time. I can't think of higher praise.  Low level detail increased to a great degree. Previously obscured detail was laid bare. Each instrument and voice gained, not only an extra dimension in space but, resolution giving a sense of the artists emotional intent. Leading edge attack transients are more delineated throughout the frequency range. This was most noticeable with all types of percussion. Snare, cymbals, toms, and kick had much more snap and precision."
Tortuga Audio Passive Preamp recommended by

HiFi Pig Reviews the LDR6

"There is just a sense of absolutely everything having been stripped free of fuzz and imprecision. Instrumental placement isn’t approximate or inferred. Instead, instruments are precisely located at a fixed and exact distance from the others with the space between performers and the characteristics of the recording environment jaw-droppingly obvious.""... the LDR6 produces a sound completely free of colouration, with a soundstage that was just consistently deeper and better resolved than with any other passive pre-amp I have ever used.""...suitably matched, sonically, the LDR6 is an absolute gem. Jaw-droppingly transparent, with faultless microprocessor control, this pre-amp provides a level of transparency usually the domain of hair shirt enthusiasts, with the convenience of remote control." logo

RMAF2014 Report By Kemper Holt of

Volti, Tortuga, Triode Wire Labs, Border Patrol This system just made you want to stay and listen to music, mine or music I'd never heard before. Relaxing, exciting, clear, organic came to mind. Volti had their Allura A15/MT1s ($15,900/pr) looking and sounding great. Border Patrol's P21 EXD amp ($12,750) using push/pull 330Bs and external power supplied 18Wpc to drive the 99dB/W/m sensitive Alluras. Tortuga Audio showed the LDRx passive preamp ($1495) software driven and digitally controlled unit with resistive analog attenuator using light resistive diodes. The LDRx seemed to be a perfect fit despite its affordable pricing, helping the system have a clear and transparent presentation, wide stage, and big dynamic contrasts, kudos for bringing such great performance at a low cost. Another company bringing superb sonics at attainable prices was Triode Wire Labs cables, which were used to connect everything. Triode Pete had his renowned Plus power cords in use, and his American Speaker Cables and Spirit interconnects proving again that handcrafted, made in America, great sounding cables can be held to common sense pricing. The sound here had my friend contemplating a purchase, beautiful workmanship and elegant, yet exciting sound, great room.  (From
6moons logo

6moons Review of the LDR6

"The Tortuga Audio preamp equaled or surpassed all basic performance parameters against any contenders I had in house, passive, active, tube, FET and at any price level with regards to faithfulness. That put the Tortuga Audio LDR6 into the position of personal benchmark as my current reference for accuracy. The top competition may offer equal or superior performance but that's for the future to reveal. For now the LDR6 is my top dog.""If one looks at the results and factors in the price differences, the Tortuga comes off as a powerful little piece which more than vindicates Mr. Sissener’s claims about the virtues of passives in general and the LDR6 in specific. It offered an uncluttered yet exceptionally detailed and dynamic presentation that was fundamentally honest to the signal ahead of it.""The performance of the little Tortuga reopens the passive vs. active debate.""Music through the LDR6 is an ephemeral experience. It dances with fire for a brief shining moment and disappears, leaving you wanting more."
owner review

My system has NEVER felt (and sounded) this good

"Your newsletter prompted me to say a big belated “thank you” for making the very best preamp I have ever used. From tube to solid state, vintage Western Electric and Marantz to modern Cello and Krell, nothing comes close. My downsized system is unbelievably dynamic yet completely natural and without any hint of strain, harmonically accurate and rich especially with “challenging” brass and woodwind instruments, always happy to play back what it receives. My system has NEVER felt (and sounded) this good." - Steven K Lee Logo

Owner Commentary on the LDR3x

"Today I received the LDR3x board and I am FLOORED by the sound quality. I've been using a TVC [transformer volume control] for several years and was very happy, but the LDR simply blows it away. I am hearing detail I never knew existed in recordings I have listened to hundreds of time before. Bass is better, treble is clearer, etc….the sound is killer. I am retired and have been pursuing this hobby seriously for 40 years. The last 20 years of my career was as a music wholesale salesperson – I worked for Telarc for 7 years and then for an indie distributor where I sold several audiophile labels, so I have some serious experience listening. This volume control is fabulous."   
owner review

Owner Feedback on the LDR3x

“CONGRATULATIONS! The LDRx is quite a revelation with exceptional musical qualities! I must stress that I’ve been using a Vishay bulk foil plus Holco shunt resistors,silver wired stepped attenuator for the last 20 years (Audio Synthesis’ PASSION) and that this unit was highly rated. Indeed, it is a very, very good passive control unit and I’ve been quite satisfied with it. Well, it is quite an achievement that the LDRx does everything better in a clear audible way! The music simply sounds fuller, warmer with more body and detail. Everything sounds more natural as if no electronic gear is being used. No small achievement in a system that combines a digital source, a digital 3 way crossover, solid state amplification and an all dipole loudspeaker arrangement comprising Quad’s ESL63 electrostatics, a pair of Volt bass/mid drivers and a Gradient subwoofer. No nasty boxes at all! Well, what can I say? Thank you, Morten and Merry Christmas!” – Francisco Fragoso logo

Owner “I have an LDR1 and it is fabulous.”

I have an LDR-1 and it is fabulous. Best preamp I ever owned at any price. When I bought it I thought I would get super transparent sound at the cost of thinning things out. Usually, that is the price for transparency. I took the risk anyway. I was dead wrong. The transparency is indeed the best I ever heard - but it is so full sounding - I can't believe my ears. Now, warm and full are not the same. It is not warm. It is truthful to the recording. Regardless, it is that fullness and weight and supreme smoothness without sounding bloated and without giving up one iota of detail which makes this a world class product. I doubt things could get more than 5% better at any price- even $100,000. The LDR1 is the most perfect preamp I could ever imagine.
owner review

Owner Review of LDR1

"Let me state up front that the LDR1 is the most pure, neutral, transparent, noise-free and grain-free component I have ever heard." Logo

Reviewer REALLY liked the LDR1 Passive Preamp!

"I like my tube preamp. I liked the S&B TVC that I auditioned a few years back. I REALLY like Morten's LDR1. Characteristics I found with the LDR1 can be summarized as follows: > natural full bass with good transients and heft > excellent midrange balance > improvement of a narrow band midrange ring that my speakers suffer from > clean with good transparency. Possibly a bit less transparency than I have heard before with my system, but I've never experienced so balanced a midrange in my system before which may affect that perception. > consistently great sense of tonal color, with good saturation. > highly listenable, even allowing me to listen into and appreciate music that I often find strident (even with the tubes, Chicago and Otis Redding recordings for instance). Possibly there is some softening of the edges of notes? I don't know, but it certainly was no negative for me. > a real sense of flow and a lack of sibilance and high frequency hash that brought back some memories of how things sounded with my old Phillips and B&O turntables. I did not expect this but it was great. In summary, the LDR1 is highly recommended."