100W, 200W, or 300W?


I'm pretty new to this and could use some help. Working down my list of upgrades: did speakers, room treatment on order... I think next up is to replace my amp.

I'm currently using a Harman Kardon PA2000 stereo amp that I had sitting in storage. 100 WPC @ 8 Ohm. It's "OK", but it probably the weak point in my system right now.

For speakers, I picked up B&W 805D3 tabletops with stands.

88 dbSPL sensitivity, 8 ohm. They recommend 50-120W @ Ohm for the amp power on their site.

I pulled up an amplifier calculator and plugged in some numbers:

88 sBSPL, 8 ft distance, 85 dB volume w 15 dB headroom and this came out to 3W RMS w 94W peak

I have my heart set on blue watt meters so I see the following options:

1) MA5300 @ 100 WPC, no autoformers, integrated
2) MA7200 @ 200 WPC, has autoformers, integrated
3) MC302 @ 300 WPC, has autorormers, seperates


For the MA5300, I'm concerned that there isn't enough headroom. If I even get close to the 94W peak, it means that I'm pushing the amp to the max, so I'd probably be operating in an area of reduced sonic performance since it's being stressed. Is this a correct assumption?

The MA7200 looks like it'll leave plenty of headroom and it also has (for better or worse) autoformers which seems to be what puts the "mac sound" in macs.

The MC302 is just sexy as heck... but is there any realistic gain with my current set up that I would get by buying one of these? Or is it so much overkill that I am just throwing money away at this point?
eisenb11
One can always take the stance that ’too much is Never enough....'

A pair of Crown PA amps, capable of running a kilowatt a side...

Into a floor to ceiling line arrays, anchored into both....

’Dropping the needle’ might break the windows, but Hey...

Nothing exceeds like excess...;)
Something to note. A huge amount of speakers are 88 Db. Krell or some other amplifier manufacturers make the wattage ratings on some amps seem overstated -or are Krell et al understated I cant remember. The power supply is an important feature to consider when driving difficult loads. I’m with Erik Squires 1 step at a time. Try getting your maximum benefits with what you have now by using room treatment speaker position in relation to walls and your hot seat. Let your Ears be the judge. Calculations only take you some of the way. As for the Blue meters its an aesthetic choice which may be at odds with the sound you are after.

May I follow up on @almarg advice above and suggest you hold on to your new speakers which are excellent.
Amp: consider an ATC S(?) 150 integrated. It retails far below the Macs and, all things considered, it sounded excellent driving the model up from your speakers (804).
The driving power and clarity and subjective feeling of control were top-notch.
ATC is known for their speakers -- and I love their top 2-way and their 3-way models, but I was hardly expecting them to turn out so capable electronics... a totally unfounded bias as it turned out!
My room is a little smaller than yours: about 15x15x10 high. Sub is eventually on the TODO list to fill in the bottom end - but after amp and streamer upgrades.
@eisenb11 If your room really is these dimensions then I don’t think you’re going to need all that much power since your room isn’t that big. If you are not overloading your old harmon kardon then this is all the proof of that you need. But you do have a different problem- your room is square!

It is very difficult to get the bass to work properly in a square room! The most elegant solution is to employ a Distributed Bass Array and to correct minor problems, add room treatment. Standing waves are a huge problem in a square room, and room treatment won’t fix it on its own. You’ll need to break up the standing waves (otherwise you’ll have one-note bass with the rest of the bass almost non-existant).


If this were my system I would be looking at this issue first, rather than looking at increasing amplifier power! You need that amplifier power to make bass notes without distortion, but if they are being canceled out by standing waves in your room, no amount of power will fix that- because the more energy you put into the bass is irrelevant if it simply cancels itself.

The best distributed bass array system I’ve seen is known as the Swarm and is made by Audiokinesis in Texas. Essentially it is 4 subs, each about a 1 foot square by 2 feet high. You place them directly against the walls. Two are in front, and the other two are asymmetrically placed elsewhere in the room, maybe one to one side and one in the rear; by doing this standing waves are broken up and you get even bass distribution in the room down to 20Hz. They do not operate above 80Hz so you can feed them a mono bass signal (so they can all be fed from the same bass amp) and as long as they do not go above 80Hz then the main speakers will convince you that bass drums and bass guitar is in front of you since their harmonics will be coming from the main speakers.

I am very unconvinced that you need more power. In particular, if you took the bass notes out of the main speakers (some subwoofer crossovers do that) then you’ll find your amp has plenty of power.

@auxinput Being new to this, I'm still figuring things out - but that's why I came into this thread with an open mind - despite wanting a Mac, I'm now seriously considering other options and doing research on the many things that are being written in this thread - learned/learning a ton. After all, what would be the point in me asking for input if I didn't care what you all had to say! Keep the info flowing! :)

@ei001h Yeah, that's what I'm laerning - after listening to the videos, I really liked the detail from the Luxmans. Also, they seemed to tame the tweater without being overly mellow. My concern with the Macs now, if they may be a little bit too laid back for my taste. As you mentioned, I have a highly resolving speaker and I'm looking for something that will pair well with it, without overdoing it and getting me fatigued - currently with work-from-home in full swing - I'm listening to the thing all day!

I'm located in Redondo Beach, which is a suburb of Los Angeles. With COVID in full swing (and beyond) over here, I've been trying to limit going out for the time being.

What do you think of the Levinson integrateds? Haven't done much research into that brand yet, but I know that they've been around since I was a kid.

Did some initial searching for Luxman, but they seem hard to find used, in general. The few that I found appeaer to be Japan imports that need a step-down converter. Is this the norm? Or am I looking in the wrong places to find these?

@atasphere those are the general dimensions of my room, but it's more square-ish because there are things jutting into it like a closet, offset door, entry way, etc. I do have acoustic panels on the way (eventually) from GIK, but they're super backordered. Expect them at the end of the month. I have corner traps up to the ceiling to take care of an open corner. The other corner, can't fit corner traps, so I have a 6" monster trap that will go against the wall near that corner. 6" monster trap on the wall across from the speakers in the center. 6" alpha traps with some diffusion on either side of the wall across from the speakers. And two quadratic diffusors to go between the speakers. Should be interesting!