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Graham Slee Power Amplifier |
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morris_minor
Moderator Group Joined: 27 Mar 2012 Location: Surrey Status: Offline Points: 6017 |
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Welcome to the forum, Dave!
Graham's posts are always interesting, and it's great to see the development process "up close". The posts about what was to become the Accession phono stage were made into a series of blog posts, which make for very interesting reading .
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Bob
Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
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BAK
Senior Member Joined: 14 Mar 2010 Location: Kentucky, USA Status: Offline Points: 1744 |
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Good to repeat. |
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Bruce
AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way! |
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brubacca
Regular Joined: 28 Jan 2021 Location: Pennsylvania Status: Offline Points: 49 |
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i'm amazed how big a small wattage amp can sound. Although buying speakers on the high 80s efficiency can go a long way as well. I have pairs of speakers rated at 85dB and 83dB and they need some gas to get going.
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Regards,
Charlie Pennsylvania, USA |
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Sylvain
Senior Member Joined: 18 Jan 2010 Status: Offline Points: 481 |
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Yes I concur with much of above. Proprius power BW 89db in a 4X5metre room admirably and energy to spare .....but Power is not everything but useful to be developed in Transient dynamics ........ 25 Watts into 8 Ohm and Focal go down to 3 ohm at phase periods and Proprius generate over 45 Watts .....Yes and also you have two Units one attached for each Speaker ......and no waste no long cable impedance etc.. Very Neat design and very satisfactory performance in a lounge setting with 89 to 91DB speakers
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shashirao
Senior Member Joined: 04 Apr 2015 Location: Minneapolis Status: Offline Points: 156 |
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Anyone experienced the Proprius with Magnepan speakers? I am looking at pairing the Proprius with either Magnepan LRS+ or Magnepan 1.7i speakers. If not, here are the specifications for the speakers - any thoughts?
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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I didn't expect to see 2.83V in the sensitivity spec. 2.83V is used to develop 1 watt into 8 ohms. It's the square root of 8. You'd use 2V for 4 ohm speakers. 2 x 2 = 4, and 4/4 = 1 watt. Or the harder way: 2V/4 ohms = 0.5A, and 0.5A x 2V = 1 watt. So, let's try 2.83 x 2.83 (rounded) = 8, and 8/4 = 2 watts. Or the harder way: 2.83/4 = 0.707A, and 0.707A x 2.83V = 2 watts. So, the sensitivity is quoted for 2 watts instead of the conventional 1 watt, hmm... That means the sensitivity quoted as 86dB, is twice the power as for 1 watt. And twice in power is 3dB. So the real sensitivity for 1 watt is 83dB. The Proprius will drive them, no problem.
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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Ernie
Senior Member Joined: 23 Jan 2014 Location: Birmingham UK Status: Offline Points: 386 |
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So 4ohms (3.2 minimum) 88db will be no problem either? Just a bit weary of 4 ohm speakers full stop. The specs do say amps from 15 to 250watts. Looking to have a listen to some Kef R7 Meta speakers. Anybody tried them?
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There are 10 kinds of people. Those who understand binary and those who don't.
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