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Speaker recommendations for Proprius?

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RichardSwan View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RichardSwan Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2021 at 6:09pm
Originally posted by Graham Slee Graham Slee wrote:

My concern is your square room. It cost me dearly to realise just how much influence room shape has on the tonal response. I was aware of acoustics but didn't think it would have such an impact as it did. I'd had an extension built to the workshop, but I'd lost one foot off the width due to the construction method I'd asked for. The extension was to be my office where amongst other things, I could audition my work. I could not audition a thing! The almost equal height to width caused boom. My posh new office ended up being workshop space, and the workshop got partitioned off to become my office. Being a foot wider with the ceiling height six inches lower solved the boom problem. I used the Amroc calculator to find where to place the partition wall, which gave a room ratio that fitted the "Bolt" area and the "Bonello" response. I went considerably further than most would do to absorb the room mode pressure zones using BBC absorber homemade clones. The room modes are still audible but not as prominent.

There is little that can be done in a domestic situation, and I'm not suggesting you go to the extremes I had to go to. However, if your aim is for good sound, which I think it is, I would seriously look at ways to improve your acoustics. I would be thinking about losing three feet off one floor area dimension - perhaps by fitting something like this?


If you can't, then I'd go for a bass reflex whose port resonates anywhere but the strong frequencies shown on the calculator, somewhere between 70 and 90 Hz.

Thanks, Graham. I don’t have much flexibility to change room dimensions, so it seems I will have to try to audition a selection in the space I have, and then choose..... There might be an option that I can explore.... What would be your opinion if the room was 18’ x 13’6” x 10’ high, with the speakers along the long wall?


Edited by RichardSwan - 04 May 2021 at 6:19pm
Origin Live Sovereign, Origin Live Enterprise (12"), Lyra Kleos, Accession MC, Solo Ultra Linear DE
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RichardSwan View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RichardSwan Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2021 at 6:16pm
A
Originally posted by Aussie Mick Aussie Mick wrote:

Hi
  I run Accession MC direct to Proprius to drive a pair of PMC Twenty5.22. It’s fabulous! I agree with Graham about the square room, I’m sorry - just a month ago a I moved from a 6m x 6m room to a 8m x 5m rectangle. Holy cow! My system sounds a great deal better in every way. 
A friend built a false wall in a square room (made it a storage space) so as to have a rectangle for his hifi and it looks great. Cheaper I suspect than upgrading components or speakers to achieve the same improvement.
Good luck!
Mick.
Thanks very much, Mick.... I had no idea that room shape could make such a huge difference....
Those PMC Twenty5 22i speakers could be a real contender and at a great price point....Smile
Origin Live Sovereign, Origin Live Enterprise (12"), Lyra Kleos, Accession MC, Solo Ultra Linear DE
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bags Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2021 at 7:59pm
To answer the question what do I mean by efficient, two of my pairs of speakers are resistive 8 ohm loads, a typical valve speaker if you will.  The third pair are a more like a real world 6 ohm load.  They typically respond well to biamping (4x Proprius rather than 2 is a consideration on your budget.)  The less resistive pair sounded good whereas the more resistive pairs really sounded great.

Of the resistive pairs one was 93db efficient whereas one was only 88db efficient.  As expected, the 93db speakers were louder at any given volume setting, but both were dynamic like real music is.

Bear in mind that other folk on this forum use speakers that are less resistive with propriuses and are very happy with them. I'm sure Graham also tested them with a wide variety of speakers in development..  However, to my ears the more resistive load allowed the amps to perform at their considerable best.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2021 at 8:37pm
Good points well made. I liked Bags' earlier advice about using the new amps with your existing speakers. That allows you to start from a sound you know, then experiment with speaker positions and where you sit. Graham is right as I've written many times... room dimensions are the starting point, I have a nearly square room and it took some figuring out on the positions for hifi and furniture, then I added some bass traps.

If it helps I have used a lot of different speakers with my Proprius amps in my listening room. I suggest it will be about matching your preferred sound and the speakers you try.

Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 04 May 2021 at 9:11pm
Originally posted by RichardSwan RichardSwan wrote:

What would be your opinion if the room was 18’ x 13’6” x 10’ high, with the speakers along the long wall?

Much better!

With speakers set apart 7 feet you can afford them to be 3 feet out into the room, and you would be 3 foot 6 away from the 'back wall'. Just try and keep it symmetrical.

Not simple enough for Google-Bot to understand...
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