L300 Summit with Nelson Pass crossover mod and First Watt J2 Amp

[Sepperl]

[QUOTE=Murillo Moreira;369309]Attachment 63778


A = 9,5cm
B = 23,5cm
C = 4,cm
D = 7,cm
F = 3,5cm
G = 35,5cm
H = 4,cm
Bassreflex outer Dia 10,5cm length of tube 10,cm
All measurement from the top without glass and foam.
Instaed the foam I use felt under the glass felt+ glass is 1 cm together.

If you need any support let me know
Regards

[Murillo Moreira]

WOW!!!!!!!!!!!!!!!!!!!!!
This is my Christmas best gift!

Thank you so much.

Murillo

[Murillo Moreira]

Just bought... as suggested from my friend DavidF

[Murillo Moreira]

For the internal cable I think it will do a good job, specially with the madisound components:

Solen 2.25 mH Perfect Lay Inductors 14 AWG pl2.25		2
Solen 1.0 mH Perfect Lay Inductors 14 AWG pl1.0		2
Solen 0.22 mH Perfect Lay Inductors 14 AWG pl.22		2
Solen PB 22 mfd Metalized Polypropylene Fast Capacitor 400V cp22		6
Mundorf 1.0 mfd Supreme Caps ms1		2
Solen PB 2.2 mfd Metalized Polypropylene Fast Capacitor 400V cp2.2		2
Eagle 20 ohms 20e		4
Eagle 16 ohms 16e		4

Will post a pic after completed.

[Murillo Moreira]

[QUOTE=Sepperl;369329]

Attachment 63778


A = 9,5cm
B = 23,5cm
C = 4,cm
D = 7,cm
F = 3,5cm
G = 35,5cm
H = 4,cm
Bassreflex outer Dia 10,5cm length of tube 10,cm
All measurement from the top without glass and foam.
Instaed the foam I use felt under the glass felt+ glass is 1 cm together.

If you need any support let me know
Regards

Man you made my day! Thx

[audiomagnate]

25 watts on an L300? That's like a Ferrari with a 40 mph limiter!

[Murillo Moreira]

25 watts on an L300? That's like a Ferrari with a 40 mph limiter!

Hi magnate, totally agree with you! I was not sure about this but after reading some posts I forget this idea. Yesterday I went to a friends house to hear a 4315A powered by two mono Cary audio 805 tube amps, 50W each, it was a very good experience, sound was awesome, but it lacks some bass and the distortion levels are high when we tried to turn up the volume.

The Cary are class A amps, with no negative feedback, i noticed that at low levels listening, it's awesome, but when we want to go louder... no way.

We also noticed that the L-pads were totally bad, I used a spl meter with some test signals to adjust them and one speaker the HF was +3 and the other -3 to get the same loudness. This speaker sounds awesome, unfortunatelly it has not the deep bass sound of the 15 inch JBL drivers, but the sound is very organic and dynamic.

We tested a Krell KAV-300il that's 200W per channel and the distortion was gone, but the fun of the speaker also take a ride with the distortion. The sound became to much analytical, cold, and not for my taste.

Incredible is that I use this Krell with my B&W 801 and the sound is very good.

I would like to ask to you guys if the 2420 driver has any support at the enclosure, it's very heavy and I can't believe it's only supported by the screws.

Thx and a merry christmas to every JBL fan out there!

[christo]

I would like to ask to you guys if the 2420 driver has any support at the enclosure, it's very heavy and I can't believe it's only supported by the screws.

I had an LE-85/H91 mounted on 3/4 in particle board with no support bracket for over 25 years with no issues, but if I was moving to a new home I removed the all the speakers from the cabinets. Would I do this again probably not.

[Odd]

25 watts on an L300? That's like a Ferrari with a 40 mph limiter!

Pass 25W sounds very good if you go active, and use it for HF.
But you must have more power to the bass driver.

[Murillo Moreira]

I think I will go with the Cary Sli-80,

80 watts per channel in Class A/B ultra-linear mode, push pull amplifier design, 40 Watts per channel in Class A Triode mode, stereo integrated amplifier, 3 stereo input pairs, sub woofer preamp output, black steel chassis, KT88 output tubes. Standard with remote volume control, has 4 or 8 ohm speaker impedance switches, headphone jack, triode or ultra-linear mode switches and oil filled capacitors. Black anodized aluminum front panel.

40W in class A may give me the sweet sound of the tubes and if I wanna go rock, ultralinear will give me 80W.
Of curse a 300W ss amp would give me a more controlled bass and kicks some ass, but the tube sound is just incredible with these speakers, I heard the 4315 with a 50W tube amp and it really make me very pleased.

Of course I would like to hear what everybody thinks about that.

[Murillo Moreira]

also there are 2 subwoofer pre-outs, to use with active subs, in this case I wonder I can use it with a solid state amp to bi-amp the L-300.

[hjames]

I run my JBL L200 3ways (similar to L300s) with a 60w/ch Jolida JD502BRC integrated amp.
With a quad of 6550 output tubes, it won't go "stupid loud" but its plenty full for most music.
Great highs and mids, nice tight bass, and plays them or the Von Schweikert VR-4s quite well.

[Crestwood23]

I have had amazing results bi amping my L300s (with nelson pass crossovers) using a Marantz 8b on the HF and a Crown Com Tech 800 on the LF. I agree that the horns and tweets love tubes, but I do think the big 15" woofers respond much better to high damping factor SS. I use a tube pre as well (Juicy Music Blueberry Xtreme) and it is a nice gain match for both amps. I have found this configuration to be the best of both worlds - mids that bring tears to your eyes and bass that will kick you in the ass when called upon.

My brother in law runs his L300s with a beautiful pair of fully restored Mcintosh MC60's (with stock original crossovers) - that setup also sounds fantastic in its own way, but I do think it ultimately lacks the deeeep bass and ultra dynamics these speakers are capable of.

[BMWCCA]

I run my 4-way 4345s bi-amped using an Ashly XR1001 and a Crown PS-200 on the upper-three drivers and Crown PS-400 on the 18-inch woofer. That works out to about 100-watts-per-channel on top and 200 on the low-end. I've never heard any distortion even at stupid volume levels (infrequent), and the Crown IOC lamps have never even flickered.

I haven't used tube amps since trading my Fisher SA1000 for my first Crown D150 sometime around 1970. Never missed it and never had any reason to describe the Crown sound as anything but musical.

[Murillo Moreira]

In this case of bi-amping the l300, I can have other solutions...
I have a Harman Kardon Citation II tupe amp, KT88 60W/ch that I could use for the 2420/2405, and a Krell KAV-300il for the 15"drivers, I think will be a greater option instead of a integrated tube amp, but my concern is with the output/input impedance match of the citation and krell pre-out, only listening to know.
Sometime ago I had an audio store here in Brasil, so I heard a lot of equipments and have my preferences. I still have some pieces and will have a lot of great time trying to discover what is the best combo.
This is what I still have, and will not sale because I'm tired of selling good gear for so less money, I remember that I had a threshold stasis S300 that I sold for less than $800 and that makes me feel sad when remembering that. MBL 5011 preamp, Zanden, Audio Research V110, VTL, also were in my inventory.
This is what survived:
Krell KAV-300il - Audio Research LS7 - BAT VK5 - BAT VK500 - Harman Kardon Citation II