Which stereo amp to try under $30k

mayoradamwest OP

almarg
The impedance curves shown in John Atkinson’s measurements of your speaker indicate, on paper at least, that the speaker is highly unfriendly to tube amplification. Especially in key parts of the bass region that you are concerned with, e.g. 50 to 100 Hz or so, taking into account the phase angle plot as well as the impedance magnitude.

Totally agree with Al on this, I might just add that the -64 phase angle combined with the low impedance at 70hz could be seen by the amp as 2ohm or even lower.

But because the 802d’s are 91db, only 50watts will do the trick, so long as you don’t want party levels..
But!!!! that 50w needs to almost double to 4ohm 100w and again to 2ohms 200w, to make sure the amp has good current, and it needs to do that without breaking a sweat, and stay stable doing it.
Solid state amps with bjt (bi-polar) output stages will be your best best.

This will do a magnificent job, and you can select your own amount of Class-A bias on the front on the run, also good for hot days, just back it off.
https://gryphon-audio.dk/shop/power-amplifiers/antileon-evo-stereo/
or the cheaper Mephisto https://gryphon-audio.dk/shop/power-amplifiers/mephisto/


Cheers George

I second the Gryphon Diablo 300 recommendation!  For the money, there are few integrated or even separate amps that are in its class.

Very powerful and gives very nice bass.  Not overly punchy, but cool and organic.

You should be able to get great bass now with the McIntosh (the Grateful Dead always did). I've always thought the Nordost line sounded bright. Try different cables - which, I know, is another entire thread. 

Hullo MayorWest, apologies for the delay in responding, I wanted to check with Boulder to make sure i wasn't giving out incorrect information.
 It was a pre owned 2060 that i initially suggested, as you say a pre owned 2160 would likely be a budget buster, and more to the point, i don't believe there has yet been a used 2160 on the market.

Basically your information is correct, as confirmed by Boulder

"With regard to your enquiry, the 1160 and 2160 are very different beasts, although, both absolutely stunning as you would expect from the stable of Boulder.
The 2160 is 600 watts/channel in pure Class A operation, the amplifier is biased as not to act or double up to the equivalent of a log burner, it will run warm, but nothing to be concerned about.
With regard to its power, it will handle any load you care to place (speaker type) through it.
I’ve had the pleasure of hearing this amplifier, and as you would expect, it’s jaw dropping.
The 1160 is biased more towards a class A/B status, rated at 300 watts/channel, it’s no slouch though, very open with a massive soundstage.
You’ve also made a correct assumption with regard to 2x 1160 used to bi-amp or bridge.
They totally come alive in this configuration, extremely musical open and dynamic, everything you would expect really."



It can be plugged into a regular outlet and is configured for the market it is sold in. I understand that some owners of the 2000 series upwards do install a dedicated 32amp circuit in order to get the best from it. I've done the same here.

 I will admit to being fairly nonplussed at the idea that 2050's sound sterile. IME these are the most richly textured, lifelike power amplifiers i have heard. But i will admit to preferring mine when fed by a valve preamp- i use a Wavac - it sounds less awesome than with a Boulder preamp, a tad rounded off at the frequency extremes, but gains some seductive magic while maintaining an iron grip at all frequencies.
 I'm unfamiliar with the review you referred to, but i found the positive feedback review of the 2060 to perfectly encapsulate what i experience with my 2060, to the extent that i now trust their reviews above all others



"https://positive-feedback.com/Issue27/2060_boulder.htm

Mayoradamwest,

I read that you were in the San Francisco area. Here is an even that you may be interested in?

Philip O’Hanlon, who is the North American distributor for Gryphon Audio will be hosting with Audiovision San Francisco the evening of Friday 9/27 through Sunday 9/29 with Audio Vision S.F. at the Holiday Inn on 1500 Van Ness Avenue for their 20th Anniversary event, presenting a full Gryphon system with choice music. you may want to drop by if you are in the area.

  GO HERE for more info