Glad to hear you’re enjoying the speakers. At the end of the day you have to like what you hear. We all have our own preferences. Enjoy the music!
May my hearing never improve to the point where I can hear bumps in the impedance curve. You are truly gifted.
Yeah, i understand where you are coming from. We do not have to convince anyone, about anything. If it sounds right for you, its all right!
But🙂Well, almost. If you are reasonably sane, you will want to and have to test ”it” against reality.
Well my really high fidelity speaker theory after 40 years of testing builds is: Go really big, or go home - as a utterly defeated and spanked weak-fi midget speaker donkey.
🙂🤚
In an earlier post I asked for suggestions about speaker pairing for Aleph J. Zen Mod was plugging Heresys. After much research, I ended up building Crites 1.5Ts. (https://critesspeakers.com/crites-speakers.html). They are a two way with horn tweeter driver and 12" woofer. My original speakers were Zaph MTMs with a subwoofer. For years I thought they were just fine and then I compared them to the Crites. Holy crapola, what a difference. I didn't know what I was missing. A whole other dimension (or two). I can't stop grinning every time I listen with them.
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I have to make a real fast decision as friends are coming over from the USA and might bring me the sweet FW pcbs without the need to pay for taxes and expensive shipping to EU.
What's the lowest required 8ohm speaker sensitivity that can be still properly driven by the 25wpc First Watt designs? Average moderate listening levels. Room size up to 25 sq meters (~270 sq ft)? I am considering building new pair of speakers next and those might be in the range of ~87-88db/1w - 2way or 3way classic troels designs.
What's the lowest required 8ohm speaker sensitivity that can be still properly driven by the 25wpc First Watt designs? Average moderate listening levels. Room size up to 25 sq meters (~270 sq ft)? I am considering building new pair of speakers next and those might be in the range of ~87-88db/1w - 2way or 3way classic troels designs.
I'm thinking mid hi high 80s. A room that size maybe less. Aleph J is great
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I have a second-hand pair of PMC Twenty 22s (quoted sensitivity 90dB) and get surprisingly good results with a single stereo ACA (driven by a Whammy), albeit in a relatively small UK room. I get the impression the the highish output impedance of the ACA allows for a slightly looser bass control, which suits the room and my musical tastes.
However, in the psychoacoustics domain reality is invented by the grey matter between a person's ears.
I would agree with upper 80's to lower 90's. It also really depends on the music and the room size too.
My thots as well. With the 18w SIT-3 i am happy with my big 87dB MTM. They sound find eith the ACAmini — until you want to turn it up.
dave
are your speakers 4ohms? F5 can handle a tougher speaker to drive than many other pass clones and puts out more juice in to 4 ohms. I did not particularly like the ACAs or aleph J on 82db 4 ohm speakers, but loved the aleph J on more sensitive 8 ohm speakers.
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M2X may also be a good option because it puts out 40w into 4 ohms
I have m2 and love it! i use the f5 and m2 and f6 for tougher speaker loads and j2 and aleph j for easier loads, soon adding a vfet to this group, (thank you Burning Amp raffle!)
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That's the reason I am choosing from F5 and M2x. Both drive heavier loads better and that leaves me with more options available in choosing next speakers project. M2 is an easier build as well and can be built without obsolete or hard-to-get jfets.
How sensitive are your speakers? Impedance?