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07-22-2008 Post does not mapped to Knowledge Tree
mumford
Posts 10
Joined on 06-10-2008

Post #: 1
Post ID: 7864
Reply to: 7864
Incorporating active crossovers into DSET
I am very interested in your DSET adventure, and is trying to learn more about the application of adding crossover elements into SET amps.  Looking at the schematic, I noted that you add first-order passive filters before the first stage of your amp and different sizes of couping capacitors between the first and second stage, and is wondering

[1]  Without using a buffer before your filters, does the source before the amp require any special attention?
[2]  Can you recommend any books, papers, webpages, etc, that you referenced in designing the crossovers? 
07-22-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,495
Joined on 05-28-2004

Post #: 2
Post ID: 7865
Reply to: 7864
How to make amplification without an unnecessary waste.

Mumford,

Let clear first with terminology. You post said about “Incorporating active crossovers into DSET” and I think it is not what you are interested; at least it is not what I am practicing. An active crossover implies a use a dedicated active stage/s just for sake of crossovering. I am religiously against it and I am considering that the active approach is a superfluous waste. Generally there is always an opportunity, even with such a simple amp as my Milq is, to present a filter to an amp, and in case of DSET a filter is an intricate part of design.

The filter I use usually called line-level passive. There are no rules how them are used: they might be high or low pass, the might be located before the amplifier stage, between the stages, in plate supply, in feedback or whenever you can imagine. It is all what and by what kind mince you would like to accomplish. Doing it you need to care about the fixed filter load, about an also of your source to drive the filters, about the slope of your filter and the most important the topology of a filter to the given filtering range. A parallel cap, the LR chain or the RL in feedback would write for you’re the very same curve – it is purely up to your intention and your ability to discriminated results that would desecrate what specific solution your would like to go for. Sure, there are some limitation in amps, particularly if you are willing to go for high order filters, but there are also always the opportunities to use subtraction filters and separated filters to writhe shaper curves… The possibilities are truly endless… 

 mumford wrote:
Without using a buffer before your filters, does the source before the amp require any special attention?

In my case it is very much so. With 6 channels the input impedance of my 6-Ch Melquiades is 5K, and this frequency-dependant 5K of very heavy to drive. Some there at my site I wrote that what my preams was out the sound was disastrous and only my DC coupled DACs were able to drive my amps.

 mumford wrote:
Can you recommend any books, papers, webpages, etc, that you referenced in designing the crossovers? 

No I cannot. First of all because I do not know any. The filters design is well know subject well covers in any book. However, I did not see a whole lot of people who use sane empirical ways to evaluate what filter they need and in what kind application. However it is all not very complex and you will not face any problem. Print your amps circuit and look at it creatively. Then you will find a LOT of places where you will be able to stick a filter. To circulate the filter it and then to fine adjust them very simile… BTW, in contrary to speaker filter the line-level passive filters are very predictably behave.

Rgs, Romy the Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
07-22-2008 Post does not mapped to Knowledge Tree
mumford
Posts 10
Joined on 06-10-2008

Post #: 3
Post ID: 7868
Reply to: 7865
Thanks
 Romy the Cat wrote:

Mumford,

Let clear first with terminology. You post said about “Incorporating active crossovers into DSET” and I think it is not what you are interested;

The filter I use usually called line-level passive.


I apologize for my mistake with terminology.  It is indeed the "line-level passive" that you are referring to.  Thanks for your advices.

Page 1 of 1 (3 items) Select Pages: 
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  Lamm Industries: a special interview with a special com..  I do not think so but I migh be wrong....  Audio News Forum     94  907034  09-18-2005
  »  New  5 Channel Version of Melquiades..  Very easy....  Melquiades Amplifier  Forum     21  162049  07-23-2006
  »  New  6 Channel Version of Super Melquiades..  The first Milq screw up....  Melquiades Amplifier  Forum     131  844684  08-08-2007
  »  New  A DSET is better then an expensive SET..  DIY Stradivarius...  Audio For Dummies ™  Forum     41  239887  09-21-2007
  »  New  Entry level DSET Melq?..  Look outside the Lundhal if you need more current to dr...  Melquiades Amplifier  Forum     10  72414  01-25-2008
  »  New  All Active! A DSET and multi-way acoustic system...  Hahaha...  Audio Discussions  Forum     14  78221  01-31-2008
  »  New  Dual channel SET..  Space exploration...  Audio Discussions  Forum     8  53922  04-17-2008
  »  New  Single-stage Melquiades vs. DHT amps..  A hallucination?...  Melquiades Amplifier  Forum     397  2499431  11-22-2008
  »  New  The DSET perspective examines the Herb Reichert article..  Are you still in Reutlingen, Germany?...  Melquiades Amplifier  Forum     5  65470  07-01-2009
  »  New  If you’re multiamping then use passive-line lever cross..  Crossover and DSET?...  Audio For Dummies ™  Forum     3  35622  01-21-2009
  »  New  Thomas Mayer’s Triamp..  It is much more then juts "properly calculated and...  Melquiades Amplifier  Forum     2  24663  03-03-2010
  »  New  Thomas Mayer’s Triamp..  It is much more then juts "properly calculated and...  Melquiades Amplifier  Forum     2  24663  03-03-2010
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