@luckyrainbow63 I own the K-300i and played it with my incredibly power hunger Thiel CS3.7 over the past week and a half. It sounded great. I think the K-300i was tested by a British mag to have over 400 watts at 2 Ohm. The Thiel goes down to 2.5 Ohm a lot. Unfortunately, I cannot find a link to the measurements that mag did. If I do I will post a link on this thread. Your Quads seem to be an 8 Ohm speaker and 150 watts should be perfect for it.
I am listening to the K-300i as I type this but this time with an Audio Mirror Tubadour III SE DAC and into the RAAL SR1a headphones. I had a shootout with the CODA CSiB | Krell K-300i | all Benchmark stack, to find the best pairing for my tastes for both the Thiel CS3.7 and my RAAL SR1a "earphones".
I sold the CODA this afternoon though I loved that integrated with the AMT3SE and my SR1a. I initially did not like the all Benchmark stack with the SR1a but I today I tried it with the AMT3SE DAC. I believe the AMT3SE was now burned-in properly because today for the first time I liked the HPA4 + AHB2 + AMT3SE as much as I like the Krell 300i + AMT3SE with the SR1a.
I am not 100% so I will give it another weeks worth of listening.
My K-300i sounds great with the power hungry Thiel CS3.7 and also with the power hungry SR1a. It has the most bass of the 3 units I have mentioned. It is also the smoothest of the 3. It is also a very relaxing sound but with great detail. The AHB2 monos sounds a bit crisper but that is lessened a bit today with the AMT3SE on the Thiel CS3.7.
So the winner of my shootout for duty with the Thiel was the Benchmark stack with the AMT3SE. The Krell 300i is now setup to only play with the RAAL SR1a earphones. A lot of money for that single purpose. So I may sell the Krell and get the dedicated RAAL HSA-1b headphone amp for the RAAL SR1a. It is half the price. I was thinking of switching amps every other week but the Krell is too big to do that easily.
Today I also played the K-300i DAC's HDMI ARC output with my TV and the sound was top notch. I heard this only via the SR1a because I do not want a TV in-between my speakers in my office. The Krell was initially bought for another room but my wife did not like that idea :).
I posted elsewhere my thoughts on the DAC module of the K-300i. I said that the RJ45 streaming is OK with my cheap CAT5 Ethernet wire. However, when I put my Fibre Optical streaming gears to the USB of the K-300i the sound was transformed to the level of the AMT3SE. That is a big deal. Especially for a one box solution.
I demoed the ML 585 with Magico A3 and the ML 5805 with some Wilson $16k speaker. The ML 585 for me is the better unit though I am told the internal DAC on the 5805 is a bit better. However, the Krell K-300i is still the one I would get even if they were both the same price. The Krell is about 1/2 the MSRP of the ML 585.
Keep an eye out for a FOR SALE on the Krell in a week or so. My 2 week old unit may go for sale depending on how the AMT3SE test with the Benchmark stack and the SR1a goes. Or I become sane and just get the RAAL HSA-1b for the SR1a.
BTW - if you post on A'gon to someone and use the @ symbol, such as
@luckyrainbow63, the @ user will get an email notification that someone asked the recipient a question.