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Dear Hafler / Dynaco enthusiasts!

The following page lists manuals and schematics for various Hafler and Dynaco products. If you are looking for something specific, please check the list below. This list comprises everything we have available at this time. If you do not find what you are looking for, please note that Radial purchased the Hafler brand and was not involved in any of the manufacturing. Thus, we do not have source information. We are however working hard at increasing the data on the web site and are encouraging folks to provide data that we can share. So if you have schematics, manuals or anything else that you believe would be of value to fellow Hafler and Dynaco enthusiasts, please send them our way.

The following documentation is provided as reference only. Hafler (division of Radial engineering Ltd.) has no way to assure that the information provided is accurate or represents the latest revision of a given product. Any use of the schematics presented herein is your sole responsibility and is done so under the understanding that you are taking the full and entire risk for their accuracy and that you shall hold Radial (Hafler) harmless under any and all conditions.

Hafler (Radial Engineering Ltd.) does not currently offer any form of repair service for products built before 2015 as we do not have access to parts. We kindly ask that you get in touch with your local repair center to see if they can assist by downloading one of the many documents made available on this site.

In the first case we'll have to rely on software to reproduce the tracks; there are several of them, and we'll probably deepen the discussion with a separate article, but for now we'll just report the most widespread (as well as free): Foobar2000. Using a PC as a source is, without discussion, the best technical solution. But it is one of the least immediate that you can use, both hardware and software side. The first aspect is related to the fact that, if you want a PC designed specifically for listening to music, you will have to fold on specific houses able to contain the noise and vibrations emitted by ventilation. As for the software side, instead, you will need to remove everything that is not necessary for listening to music in order to have optimal performance.

Once this is done, the essential next step is to purchase a DAC level. The one installed in the vast majority of PCs is very bad and risks being a heavy bottleneck for the rest of the system. There are, however, level sound cards that can avoid having an external DAC. They tend to be used less for two reasons: the first is that these cards can only be used with the PC, while the external DAC allows use with other sources; the second is that they are poorly shielded from interference generated inside the PC. So if we opt for the DAC, it will have to be connected, via USB cable (which we are working on for its introduction in the catalogue), between source and amplifier.

Another component that is not fundamental but certainly of interest is the DSP. DSP stands for digital signal processing; with these three words we indicate the processing of signals represented in real time numbers. The DSP is therefore a microprocessor dedicated exclusively to process a continuous signal after its sampling, which therefore does not replace the sound card, but is placed side by side with it. The first advantage of having this component in your system is the reduction of the load on the computer CPU. This is an aspect that, however, given the computing power reached today even by a mid-range PC, is disappearing.

Secondly, we assume that the analog signal is converted into a stream of numbers. The computing power for processing the digital signal allows many advantages over analog processing, such as the detection and correction of transmission errors, and also data compression. All these operations, aimed at improving dynamics, reducing distortion and improving the signal-to-noise ratio, are therefore carried out before passing through the DAC, which converts the signal back into analogue format.

A DSP therefore brings undeniable benefits to our listening. But its application is even more interesting when combined with a microphone. With this combo, through some DSPs, it is possible to "probe" the listening environment so that the changes made to the track by the processor make high, medium and low frequencies equalized according to the context in which they are emitted.

Timeline - Neil Young Online Archives

So maybe this is a good time to discuss the various Streaming boxes music lovers can use to stream from services like NYA or Qobuz or Deezer, to a very decent quality, but non-streaming Audio Receiver.

The Baby Boomer demographic has to be heavily skewed with music lovers that bought a good home stereo in the last 20 years, but now, it is not giving them access to the music streaming services... Since Qobuz is actively trying to help it's listeners better use what they have, there is a page on their site that actually shows the names and some info on about 30 different Streaming boxes or Network Players....Of this list which I went through with diligence, I found around 6 or 7 that look like they need to be looked in to much more deeply by people on the PONO group, and by this Baby Boomer demo in general.

Among these , and NOT ranked by any order whatsoever : WTX Microstreamer ; D-Stream Audio WR-100D Wi-Fi Audio Adapter ; Klipsch Gate ( though tech support was horrific according to existing reviews, so this might be dangerous to try till you know more) ; iFi - SPDIF iPurifier Power Conditioner ( you would use this with chromecast Audio to dramatically reduce jitter from the optical digital connection, and then allow the DAC in your receiver to do the digital to audio conversion) ...

Does anyone have any experience with any of these? I am considering buying something in this category for my Living room stereo...a Pioneer SC05 Receiver with 2 big Bowers and Wilkens towers. Good sounding stereo, but as it was from around 2007 or 8, there was no streaming even considered( though it does do DLNA, and my PC can send J River music to it over the wifi, but this crashes /fails so often I have written this off ) ...

The Pioneer SC 05 has a good anti-jitter system built in to it -- to help its DAC with CD players or other optical input jitter....and this is a very clean sounding system. Right now I am streaming to it with Qobuz using my Android phone ( LG V 20) and a Chromecast Audio dongle with the optical cable accessory. I don't actually hear any jitter --maybe due to the PQLS or Precision Quartz Lock System Pioneer built into it...never intended for Chromecast, but maybe ideal for it...Even so, I would be inclined to improve this source quality, and in the future, will probably want to get the Qobuz Sublime 24 bit 192 subscription, rather than the CD quality I have now for streaming.

I am assuming there are plenty of people in the same boat with this type of set up ???? And ultimately, the Neil Young Archives will benefit from this discussion :-)

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