DIY Sony VFET lottery discussion

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#947
2 tickets are being recycled. New new winners have been pulled out of the hat:

gijsh
chromenuts

An email will be sent later today to everyone who entered to let them know how this round turned out.

EDIT: Thanks to biju55 who already has VFETs and decided to wait for the VFET-less kits later in the year and give this opportunity to someone else. One other member that was drawn previously did not respond to PMs, emails hard bounced, did not get in touch.
 
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#952
I'm completely not qualified to quantify any of the below in technical terms—but having actually built these awesome speakers—and compared them to a set of 96db dual/single driver designed speakers that I also have—the Monkey Coffins plus Vfet will get to room leaving volumes—certainly plenty loud with NO shortage of bass—my subjective opinion. Room isn't small either—but again, my opinion. 16' ceiling peak, 12 x 26' with an additional U shaped wrap extension on one side ending in a kitchen space. They present significantly louder than any other speakers I've had in my system (89db and 96db "ratings" respectively) maybe due to being a 3-way. Also had M2X monos here to go back and forth to. Vfet holds it's own! Love it.

Variac said:
So, is the Monkey Box/Coffin efficient enough for this amp?..
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planet10 said:
is the Monkey Box/Coffin efficient enough for this amp?

Except for the transition from 12Ω down to 4Ω as the woofer takes over, the impedance is nicely flat. The reactive phase at low frequencies might be an issue.

The amplifier will output less power below the transition and they might be a bit bass lite. If this is the case the Rs in the midtrange & tweeter circuit might require.have sufficient range reduction (changing the impedance response) to compensate.

This does not consider how much electrical damping the amplifer is expected to exert on the loudspeaker. Being sealed more internal damping might cure that if it is the case.

A little less than 90dB certainly efficient enuff i'd your room is not too large and you don’t crank it way up.

dave
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planet10 said:
The actual measure shown suggests 89dB as more accurate.

As i read the graph worst at 100 Hz and just above resonance. Definitely right in the lower & midbass, and reaching up to the upper bass. I would fully expect that this loudspeaker could have issues in the bass. Someone will have to try it out.

And unlike an earlier speaker where Nelson suggested shunting a 22Ω R, the low impedance would preclude tha on these.

dave
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#954
Jason said:
2 tickets are being recycled. New new winners have been pulled out of the hat:

gijsh
chromenuts

An email will be sent later today to everyone who entered to let them know how this round turned out.

EDIT: Thanks to biju55 who already has VFETs and decided to wait for the VFET-less kits later in the year and give this opportunity to someone else. One other member that was drawn previously did not respond to PMs, emails hard bounced, did not get in touch.
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Hello Jason,

Seems Im the guy. Replied to your PM and send message to the diyaudio store email.

Thanks.
 
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