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-   -   Dennis Had Inspire Amps (https://www.audioaficionado.org/showthread.php?t=24170)

bearcity 02-05-2021 09:27 AM

About those Lii drivers. I own 2 pair. The F-15 and the Silver 6. I have not had the Silver 6s for long and at the moment I have really only had time to break them in. Not enough time to critically evaluate them. The F-15s, on the other hand, I have been working with for quite a while. Tried several open baffles. As large as Steve Dekertís biggest with little success IMO. Never could get decent base response. Good for someone who listens to Ďwall of soundí music but not for me. Then came some hybrid boxes and a tuned port mockup. All with limited success. On to the Acoustic suspension, which pictures of have been shown here. Fantastic soundstage, good punch but little rumble in the lower registers. Dennis and Straitwire punched a hole in his pair and a bass reflex was born, not as large as the drawings on Liiís website. Heard those at the shop a couple weeks ago. Bass is through the floor, snappy and will rumble appropriately. Finally a cabinet that seems to bring the most out of this very unique driver. I have not had a chance to cut a hole in mine yet. Ports are on back order. So back to the driver. Like all full range single driver speakers I have heard, the point source presentation and soundstaging are not matched by most multi driver speakers. An exception is a coaxial design like the Altec 604 series which also does these well. Where the Altec and any crossovered speaker falls short in is phasing issues. Crossovers inherently delay signal which throws off the perfect phase alignment of a full range speaker driver. The good of the crossover is the flat response achieved which is where the rub comes in on the Lii drivers. Personal experience is that the drivers are not as flat as I would like. They are too articulate at certain mid-high frequencies and I find them fatiguing. A simple contour network (at least one with a capacitor) solves this but with a minor out of phase issue mentioned above. Dennis is following the line of the purist (no CN) single driver design but is currently struggling with the fatigue issue. I have a lower limit on sharpness incorporate a CN more readily than he. In the end the Lii F-15 is a pretty amazing driver. It makes no sense that a 15 driver without a flexible surround (paper cone is glued directly to the basket), and therefore no measurable cone displacement, can be as fast, articulate and offer bass response. [emoji848] I find this driver very engaging. I often cycle through several speakers in a weekend listening session and, depending on the genre, I most often end with the F-15 and a week long engagement with my system.

P.s. at 1/5 the price of a decent pair of 604s it is hard to compare on even footing. In the end I would like to have both but for now the F-15 is plenty fun and constantly has me in awe of my Inspire gear.

bearcity 02-05-2021 09:31 AM

Quote:

Originally Posted by Comzee (Post 1031050)
Thanks for the info, if BearCity sees this, maybe he can chime in.



I myself, already ordered the F15, found a guy locally to make an MDF cab for me, based on the box specs Lii displays on their webpage for F15 (pictured below).

https://www.lii-audio.com/wp-content...a-1024x772.jpg

(Oh, and if anybody has reservations about this box design let me know. It's just the only thing I have to go off of, for commissioning a cab from my builder)



Seems like a really great price/performance speaker. I love my Omega single drivers, so I'm sure I'll like the F15.



Friend I have is curious about the Lii Silver series tho.



Comzee,

A great project. I could have saved a lot of time just starting with a BR design, but that is not my nature. These should be phenomenal but will need some tweaking with stuffing and maybe contour network. See previous post.

Comzee 02-05-2021 11:13 AM

Quote:

Originally Posted by bearcity (Post 1031503)
Comzee,

A great project. I could have saved a lot of time just starting with a BR design, but that is not my nature. These should be phenomenal but will need some tweaking with stuffing and maybe contour network. See previous post.

Thanks for the info!
Once I have them all put together, I'll post some picture :)

rmlowz 02-16-2021 04:36 PM

I am listening to my Full Music 45 n tubes I got today. I believe this is my best pair of 45 tubes so far that I have tried in my Inspire 45. Lots of fun listening to music you are familiar with for reference

Beatlebum 02-16-2021 09:32 PM

Quote:

Originally Posted by rmlowz (Post 1032672)
I am listening to my Full Music 45 n tubes I got today. I believe this is my best pair of 45 tubes so far that I have tried in my Inspire 45. Lots of fun listening to music you are familiar with for reference

Try a pair of new EH 2A3's with a 5Z3 rectifier. Excellent sound as well.

rmlowz 02-17-2021 08:18 PM

Quote: Try a pair of new EH 2A3's with a 5Z3 rectifier. Excellent sound as well.

Yes I have been enjoying them as well.

Bentan 03-05-2021 04:08 AM

After going through 600 forum pages, Iíve decided to order a PSE KT88 in mocha white to match my ATC SCM19s. Canít wait !

FloridaBoy 03-06-2021 08:45 AM

Quote:

Originally Posted by rmlowz (Post 1032672)
I am listening to my Full Music 45 n tubes I got today. I believe this is my best pair of 45 tubes so far that I have tried in my Inspire 45. Lots of fun listening to music you are familiar with for reference

I have EML solid plates too they are 'better' than the TJ's but the TJ's are better, to my ears, than old production. I know you are skeptical of burn-in but the tubes will improve with use.

x3workshop 03-07-2021 05:28 PM

I'd love to try some EML's, but the price is not something I'm sure warrants the 'improvement'. I guess I won't know unless I try them. I have several dozens of NOS 45's, including globes that I will rotate through - all various brands. I could see selling off a couple quad to fund some EML's. :scratch2:

bearcity 03-07-2021 06:04 PM

1 Attachment(s)
Quote:

Originally Posted by Bentan (Post 1034120)
After going through 600 forum pages, Iíve decided to order a PSE KT88 in mocha white to match my ATC SCM19s. Canít wait !



Attachment 64365

Youíre in for a real treat. Listening to mine (in Harley Black) right now. 2 pr 6f6s driving my latest speaker build. [emoji106][emoji344][emoji445][emoji16]


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