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Pass Aleph 2 dual power modes?
Pass Aleph 2 dual power modes?
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Old 12th February 2018, 12:21 AM   #1
raman15 is offline raman15  United States
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Default Pass Aleph 2 dual power modes?

My first post to this forum...been a lurker for a long time. After over 10 years of procrastination I decided to build out my dream system. I always wanted to build a line array speakers first then the Pass Labs power amp etc. After listening to my friend's IDS-25 speakers which really giving me confidence....I used the Murphy Corner Line Array design and built out the speakers. I did replace the drivers in the original design with the Vifa TG9FD10-08. The results were outstanding. I can post the details and pics of the construct separately if desired.

Long story short....The Pass Aleph 2 came in right after. Absolutely jaw dropping detail, presence, transparency and soundstage. I cant stop describing the superlatives. It's like listening to a live recordings while in studio. May still play with the bias a bit (less than 11mV DC offset). and replace the power supply configuration (may elaborate on a different thread)

Here lies the fundamental problem... After 20+ days of listening, testing the system I get my first electricity bill....O-U-C-H!!! Really! did not plan for this and its totally my fault. I work from home and have my system on all day streaming jazz radio or Spotify.

The question I have is ......can I with a switch cutoff half the output stage for normal background listening (save power) and only flip it full on when I do my late night listening or have friends over? Let's say I want to be green whiteout mentioning the current hole it will cause in my wallet. I don't want to change my listening habits either and definitely do not want to switch amps.

Credit to Mauro Forlani for providing the enclosure design Audiocostruzioni
The complete enclosure was manually milled (wish I had CNC)

cheers
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Old 12th February 2018, 12:58 AM   #2
raman15 is offline raman15  United States
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some pics of the speakers.....
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Old 12th February 2018, 05:16 AM   #3
2 picoDumbs is offline 2 picoDumbs  Australia
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The Aleph is not the best circuit for that idea because of it's single ended nature.
You will end up current clipping at bias settings below 1A.
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Old 12th February 2018, 05:38 AM   #4
aspringv is offline aspringv  Australia
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Pass Aleph 2 dual power modes?
...build another amplifier (this is diyaudio after all!). Something class AB, or a chipamp maybe, or one of the class D builds, and make a switchbox to select which amp to use.

Seems a shame though! That's a lovely set of builds.
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Old 12th February 2018, 07:05 AM   #5
Luke is offline Luke  New Zealand
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beautiful amps. but cant help you other than to suggest a class ab and switch box. Why not a low bias F5?
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Old 12th February 2018, 07:09 AM   #6
aspringv is offline aspringv  Australia
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Pass Aleph 2 dual power modes?
... install solar panels?
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Old 12th February 2018, 07:11 AM   #7
Luke is offline Luke  New Zealand
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Quote:
Originally Posted by aspringv View Post
... install solar panels?
or turn amps of when not in use and change power companies
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Old 12th February 2018, 02:14 PM   #8
Eric is offline Eric  United States
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Pass Aleph 2 dual power modes?
What a beautiful build! I have a pair of Aleph-2 boards kicking around that I toy with building from time to time... No doubt about it, 600w of continuous power burn is a big deal. In the winter, it helps keep the room warm. In the summer, it just creates competition with the air conditioning.

If you haven't replaced ALL of your lighting with LEDs, this can help offset things. Alternatively, pack up those energy sucking evil devices and mail them to me
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Old 12th February 2018, 02:53 PM   #9
raman15 is offline raman15  United States
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Haha...Thanks folks for your responses. Brought a smile to my face.

There is no going back here. However I do see the schematics for the Aleph 5 and 2 are almost identical except for the bias and output stages. My thought was that can I offload these to a separate board and call it "configuration board" and very easily switch from Aleph 2 to Aleph 5? 300W in savings will help
I could use high quality gold plated jumper sets or even use a bank of relays (w/gold contacts) with a single switch to toggle between the two configurations? Not sure If I'll need to do anything major with the PSU?

I know many of you may poopoo the concept of introducing relays etc. in the signal path....and my sentiments are similar.
Either mechanism could be easily accommodated on the back panel or under the covers without impacting the visuals.

Your thoughts.....
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Old 13th February 2018, 01:22 AM   #10
aspringv is offline aspringv  Australia
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Pass Aleph 2 dual power modes?
I'm not intrinsically against any of those things...

Thinking aloud here, but if you've a transformer with split primaries, you could have a selector switch that wires the transformer for 120/240V operation, thus halving the voltages on the rails when in 240V mode. That's about the cleanest solution I can think of.
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