Tortuga Audio LDR3x DIY Preamp Controller w/ Remote - Page 2 - diyAudio
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View Poll Results: What type remote do you prefer to control your preamp?
Use a dedicated custom remote? 2 10.53%
Use the Apple Remote? 5 26.32%
Use an app on my iPhone, iPad or Android? 9 47.37%
Custom plus apps? 2 10.53%
Apple plus apps? 1 5.26%
Voters: 19. You may not vote on this poll

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Old 26th April 2013, 07:44 PM   #11
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Location: South Florida
Default Pre-release sale: LDR3x DIY preamp controller board

Good news!

We are now taking pre-release orders for the LDR3x DIY Preamp Controller Board at 20% off the regular price or only $260.

You can find more info and purchase your pre-release LDR3x via the following link: LDR3x DIY Preamp Controller Board | Tortuga Audio

All the best!

Morten
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Old 26th April 2013, 08:45 PM   #12
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what is the total cost, with the discount, for a balanced set up?
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Old 26th April 2013, 09:45 PM   #13
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Quote:
Originally Posted by kuribo View Post
what is the total cost, with the discount, for a balanced set up?
We're offering the same 20% pre-release discount on the Master/Slave matched set which is normally priced at $590. So the pre-release discount price is $472.

We still need to set that up on the website/store but it should be up and available by mid-morning US east coast time tomorrow.

Cheers,
Morten
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Old 27th April 2013, 09:50 AM   #14
Crom is offline Crom  United Kingdom
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Quote:
Originally Posted by CaptainWatt View Post
Each LDR3B is semi-custom built with its own matched set of 4 LDRs including software based correction curves to ensure excellent left/right channel matching. Aside from the hardware items mentioned above, there's no setup/tweaking etc required or even possible.
Thanks Morten, I've taken a look at the articles on the website - very informative! You mention that buffers may be added to the project but I've heard that they are almost a 'must have', otherwise the output impedance otherwise goes wild, ranging from few hundreds up to 2-3k. An ideal scenario would be to have both input and output buffer - the best you can get - to avoid compromising the transparency. You don't agree with this?

Cheers,
Crom
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Old 27th April 2013, 12:08 PM   #15
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Quote:
Originally Posted by Crom View Post
You mention that buffers may be added to the project but I've heard that they are almost a 'must have', otherwise the output impedance otherwise goes wild, ranging from few hundreds up to 2-3k. An ideal scenario would be to have both input and output buffer - the best you can get - to avoid compromising the transparency. You don't agree with this?

Cheers,
Crom
Hi Crom,

If you do a deep dive into the various audio forums including diyAudio you'll find numerous threads discussing the topic of impedance mismatch and variability as it relates to passive preamps in general. I certainly agree that impedance mismatch can be an issue and clearly acknowledge that in our website.

If you place a passive preamp between: a) a source that has a high output impedance, low line stage voltage, weak current capacity; and, b) an amp with low input impedance, you will likely be disappointed in the result, declare passive preamps as being flawed, and advise others to steer clear of passives. Your experience will tell you you're right (in that instance) but you'll still be wrong.

A possible "fix" for the above instance is a buffered passive preamp. However, "buffered passive" is an oxymoron. A buffer, whether solid state or tube, is synonymous with "active". A buffer has a power supply that interacts directly with the audio signal even if it's a unity gain buffer (no amplification). It will indeed solve the impedance mismatch issue between source and amp but will impart its own characteristics onto the audio signal.

I hesitate to suggest a hard and fast rule of thumb but it's likely that if the ratio of amp input impedance to source output impedance is 100:1 or higher that it really doesn't matter that the impedance varies widely over the passive's attenuation range. No point getting bogged down in technical minutiae on that. The proof is in the listening.

I personally use mostly SS amps and love the sonic quality of our LDRx preamps. Many of our customers have tube amps and are very impressed with the sonic performance of our passive preamps which is not surprising since tube amps typically have input impedance of around 1M making impedance mismatch a moot point.

I've run 700 ohm DACs into 15K ohm SS amps with our LDR passive preamp in between with excellent results.

Bottom line is passive preamps are not a good fit for every pairing of source & amp. But when they do fit, our LDR passive preamps beat or match most any active preamp for clarity, transparency and honesty to the source material.

Not that there aren't some fabulous sounding active preamps out there. But when you consider the price/fabulous ratio of those fabulously expensive actives, our LDR passive is quite the bargain.

Cheers,
Morten
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Old 13th June 2013, 01:32 PM   #16
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Default Production boards and parts have been ordered!

Good news! Orders were placed earlier this week for production boards and parts for the LDR3x Preamp Controller Board.

Barring any last minute glitches we expect to have finished boards ready to ship starting June 24th if not sooner!

If you're interested in the LDR3x Preamp Controller Board, you can still pre-order one at a 20% discount off the regular price. The pre-release discount ends once we have finished boards ready to ship.

Cheers!
Morten
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Old 30th June 2013, 12:07 AM   #17
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Default The LDR3x DIY Preamp Controller Board is shipping!

Well, it's taken a bit longer than planned but we're pleased to announce that the LDR3x DIY Preamp Controller Board has been released and pre-release orders are shipping!

Final pricing is:
Master Board for unbalanced inputs - $295
Matched Master & Slave Boards for balanced inputs - $495
Tortuga Audio IR Remote - $49

You can find more information and purchase the LDR3x via the website/store at: LDR3x DIY Preamp Controller Board | Tortuga Audio

Click the image to open in full size.

The LDR3x allows you to build your own high performance LDR based passive (or active if you include a buffer) preamp that can be controlled remotely and also locally via rotary encoder/switch or discrete pushbutton inputs and a simple potentiometer.

Built around precisely matched digitally controlled LDRs, the LDR3x offers the DIY'er the ability to build preamp that will rival the audio performance of even the best high end preamps.

We'll be posting more pics next week and tweaking the technical manual which has been updated as of today (6.29.13) to reflect the final design/build. We still need to include more detailed artwork describing the board and the interfaces.

You'll notice from the pic that the board isn't fully populated. The board has certain functionality that isn't available to the DIY'er and thus those relavant parts are not included. We also plan on using these boards in our future iterations of our own preamp products.

All questions, comments and inquiries welcome.

Cheers,
Morten
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Old 2nd July 2013, 04:19 PM   #18
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Default Updated LDR3x Manual

Thanks to customers, we've corrected some obvious omissions from the tech manual so it's been updated accordingly. We also added some info/appendix on the reference Alps encoder that we know is compatible with the LDR3x.

The latest LDR3x manual can be found here: http://www.tortugaaudio.com/document...l_Rev0.B.1.pdf
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Old 7th July 2013, 02:01 PM   #19
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Question Group Buy?

If you're interested in the LDR3x Preamp Controller but you're looking for a price break, why not organize a group buy? Discounts would depend on the size of the group buy. How about 25% off for a group buy of 10+ unit?
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Old 14th July 2013, 01:13 PM   #20
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Default And we have a winner!

When I first announced that we would be offering the LDR3x DIY Preamp Controller Board, I mentioned that we'd give away a free LDR3x to one forum member from the pool of members who provided input/suggestions prior to releasing the DLR3x for sale.

I'm pleased to announce that diyAudio member Crom is the winner!

We'll be popping an LDR3x into the mail later this week and look forward to hearing about Crom's DIY preamp project as it evolves.

Click the image to open in full size.

The LDR3X is a digitally controlled, analog audio preamp controller in the form of a populated 2.5 inches wide by 4.7 inches long printed circuit board.

The LDR3x allows the do-it-yourself (DIY) audiophile enthusiast to build their own exceptionally transparent and articulate audio preamplifer that rivals the performance of even the best high end preamp costing 10-100 times more than the LDR3x. It can be controlled via an optional IR remote, mutl-function encoder and even via discrete digital inputs.

By itself, LDR3x is an unrivaled passive preamp/controller. Mated with a user provided buffer stage (with or without gain), the LDR3x enables the DIY’er to build a truly top notch active preamp.

The LDR3x utilizes light dependent resistors (“LDR”) in lieu of conventional potentiometers or stepped resistive attenuators for volume control. Simply put, LDRs sound better than any volume pot or stepped attenuator.

Precision control of the LDRs and all other functionality of the LDR3x is done via a software driven on-board microcontroller (microprocessor).

Don't hesitate to post a question here or PM me.

More info can be found via our website/store at LDR3x DIY Preamp Controller Board | Tortuga Audio

Cheers!
Morten
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