Purifi-based monitor - options

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IslandPink
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#16 Re: Purifi-based monitor - options

Post by IslandPink »

Going through all options, I don't think I can get port velocity from Hornresp, but i will search on the DIY Audio thread as well.

In the meantime I did a quick sim of what the driver will deliver on the sealed 30 litre enclosure that I am going to first test the driver on.
This looks quite good. The group delay at 40Hz is slightly less, but similar to what the MLTL design gives, about 4.5msec.
PuriMLTL_4ohm_30L_SPL.JPG
PuriMLTL_4ohm_30L_SPL.JPG (49.17 KiB) Viewed 233 times
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chris661
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#17 Re: Purifi-based monitor - options

Post by chris661 »

Hi Mark,

Try:
Tools > Output > Horn.

Should give the frequency response of the port only.

Then:
Tools > Particle Velocity > Horn Mouth

I tend to find that drivers optimised towards high output (ie, anything with plenty of excursion) needs attention to air velocities if they're to be used at/near full power. Of course, at a few watts the problem disappears.

Chris
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#18 Re: Purifi-based monitor - options

Post by IslandPink »

Thanks Chris, will try that later.

Been a lovely weekend, and today it's like Christmas again. Nothing like a bit of unboxing where you didn't have to pay for the things yourself !
They seem like quality items - heavy for their size and nicely finished. The cone surrounds are very intriguing.

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#19 Re: Purifi-based monitor - options

Post by IslandPink »

I just got these going, leant against the OB's, on the floor, clip leads etc.
Although there's a limited amount you can tell from this , without equalisation, they just sound classy.
You can sit on-axis to them, no crossover, and there's no treble harshness.
The upper midrange part of the vocals is clean and pure, with subtlety.
Straight out of the box they give a spacious room-filling sound even at the low level I'm playing currently.
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#20 Re: Purifi-based monitor - options

Post by IslandPink »

I've got one speaker fitted to the 30L sealed box now.
It sounds great. The bass goes quite low , enough to hear a lot more about what these drivers do.
I put on the familiar Ry Cooder 'Boomer's Story' and have nearly played the whole album.
I reckon I can hear slightly more clearly through the mix than with the OBs, on tracks like 'Cherry ball blues' and 'Crow black chicken'.
Each sound seems pure and clean with all its character there as good as I've heard.
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#21 Re: Purifi-based monitor - options

Post by IslandPink »

'Swordfishtrombones' sounded excellent.
If the 'fix' for hysteresis in the pole piece makes it work cleanly down to low signal levels, then I can hear that.
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#22 Re: Purifi-based monitor - options

Post by IslandPink »

chris661 wrote: Fri Jun 11, 2021 6:20 pm Try:
Tools > Output > Horn.
Should give the frequency response of the port only.
Then:
Tools > Particle Velocity > Horn Mouth

I tend to find that drivers optimised towards high output (ie, anything with plenty of excursion) needs attention to air velocities if they're to be used at/near full power. Of course, at a few watts the problem disappears.
Here it is for 1W ... seems a bit high ... but I have no background on this.
PuriMLTL_4ohm_Velocity.JPG
PuriMLTL_4ohm_Velocity.JPG (45.88 KiB) Viewed 82 times
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#23 Re: Purifi-based monitor - options

Post by IslandPink »

Back with the listening tests. I knew it was time for 'Nuclear Burn', and it was certainly no disappointment.
Now for the rest of the LP.
"Peridots and periwinkle, blue medallions Gilded galleons spilled across the ocean floor" ( Mitchell )
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