What have I got myself in for?
The cabinet is 1,750mm tall, 550mm wide and 600mm deep. With 25mm thick panels of Euro birch ply, the volume is approx 480 litres, or 16.95 cubic feet.
Lovely Jarrah veneer, with Jarrah hardwood trim.
The driver is Lii's top spec reference unit, with this client receiving pre-production versions. Beautifully made, in polished chrome...very heavy.
Adding some quality Cardas terminals and solid core thin cabling.
With a low Fs of 28Hz, the cabinet has been tuned to 30Hz, using a wide slot-port.
Grill cloth will be a Marshall vintage style.
Should be fun.
The cabinet is 1,750mm tall, 550mm wide and 600mm deep. With 25mm thick panels of Euro birch ply, the volume is approx 480 litres, or 16.95 cubic feet.
Lovely Jarrah veneer, with Jarrah hardwood trim.
The driver is Lii's top spec reference unit, with this client receiving pre-production versions. Beautifully made, in polished chrome...very heavy.
Adding some quality Cardas terminals and solid core thin cabling.
With a low Fs of 28Hz, the cabinet has been tuned to 30Hz, using a wide slot-port.
Grill cloth will be a Marshall vintage style.
Should be fun.
Attachments
It’s cute that they offer the impedance plot, but not the frequency response.… only a « description » of how it sounds, according to them.
The least one could expect at $2,000 a pair.
The least one could expect at $2,000 a pair.
I have a pair of the 10" silvers, also in large enclosures. Really good with lots of polyfill and a little EQ.
GM, thanks for your feedback....always appreciated. May I pick your brains on two matters?
1. With the wide baffle, what negative diffractions could be produced?
2. Is there a way to calculate the F3 of the cabinet, using the 30Hz port tuning and the speaker T/S specs?
Kind regards.
Andrew
Looking forward to reading about what you are hearing with these drivers. And seeing pics of finished project. Is the platinum 10 actually as good as some are claiming?
if i see the data it looks like a extrem horn driver, EBP 262 Hz !
Briefly trundling past; I'd frankly be more concerned that even their basic data doesn't line up. 
Qts = (Qes*Qms)/(Qes+Qms), closed-form formula. So how does it come to be that Qts is stated to be 0.175 when based on the Qes and Qms values provided, it should be 0.107 [nearly]? And that's just the start of it: the stated Vas, B*L etc. derivations are inconsistent with the stated fundamental Mms, Cms, Fs, values and / or visa versa. SPL in either 2.83v or 1w conditions is also about 3dB less than claimed using the (admittedly inconsistent) data. And so on. It might well be a lovely driver -it certainly looks pretty, at least as far as a drive unit can be 😉 but the inconsistencies in the values are a bit concerning.
Qts = (Qes*Qms)/(Qes+Qms), closed-form formula. So how does it come to be that Qts is stated to be 0.175 when based on the Qes and Qms values provided, it should be 0.107 [nearly]? And that's just the start of it: the stated Vas, B*L etc. derivations are inconsistent with the stated fundamental Mms, Cms, Fs, values and / or visa versa. SPL in either 2.83v or 1w conditions is also about 3dB less than claimed using the (admittedly inconsistent) data. And so on. It might well be a lovely driver -it certainly looks pretty, at least as far as a drive unit can be 😉 but the inconsistencies in the values are a bit concerning.
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You could do a better job of the bracing, this breaks (my) Rule 1.
Did you model as an ML-TL (which it will be)?
dave
Yeah, typical of other Lii models I've vetted; HR calcs based on Fs, Sd, Cms, Mmd, BL:
Fs = 31.33 Hz, which matches the impedance plot
Vas = 254.28 L
Qes = 0.19
Qms = 22.05
Qts = 0.19
Inputting published specs, HR (now) auto calcs Qes = 0.11, so closest with Qms = 0.11 Qts without changing either Fs, Sd, Vas or them all!
So at ~431.89/15.25 ft^3 net? Vs even the pioneer's (classic) alignment Vb = ~254.28/1.44 = ~176.58, Fb = 31.33 Hz = ~2.446x too large and T/S max flat: ~21.2 L, ~64.8 Hz = ~6.665x!
Even if driven with a matching impedance tube amp tuned to the driver's actual in cab Fs for max LF efficiency it's still pretty bad without EQ, preferably variable DF bass/treble tone controls or at least frequency shaping DSP and/or Nelson's 'lots of polyfil'. 🙁
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By my reckoning, I get -6dB at 41Hz. Am I on track, or way off....?
Also, GM, can you kindly comment on the use of the 600mm wide front baffle? Is this detrimental to sound quality? Thanks.
Also, GM, can you kindly comment on the use of the 600mm wide front baffle? Is this detrimental to sound quality? Thanks.
Not knowing its real specs your guess is better than mine as you can test various tunings till you find one you like, though using my best guess specs: 0.42 x 31.33 x 0.19^-0.96 = ~ 64.8 Hz or if driven with a high output impedance, then tune to each driver's actual Fs after break-in, so a very wide range to choose from.
Hmm, actually I did........ the short answer is it's (much) narrower than I prefer (30-48"), though most I did using Altec's 30-36" as it completely negates BSC plus boosts the mid bass lower down to cover the male's 'fullness', so might want to experiment with 'wings' somewhere down the road..........
Looks like I'll have to rewrite the long version as time permits....🙁