But it IS!
JBL 4355 speakers restored by Kenrick Sound has been delivered to Mr. Abe's room - YouTube
Ok.. not really, but it's not exactly large either.
..I don't know Japanese (at all), but I suspect the movers (just before unwrapping the 1st one) were saying something along the lines of:
"you want us to put this where?"
Me too like to watch Japanese sound installements on youtube lol
They share many similarities with us, like tiny rooms and taste for wierd loudspeakers
True, it is not cheap, but worth every penny IMHO. Personally I think it is worth saving up for. What is the use you spend less money for far inferior results. Sometimes you gotta have patience and save up for the really good stuff.
If I only
aved up for the best I'd never get to build anything Besides the £850 it would cost to get a pair of TPL150H is in the ball park of the total cost for this project!!
Hi Stig
Yes, it is definitely one that caught my eye. I can't say I'm saving up for it, though, because my listening space is such that I won't be able to move the required minimum listening distance of 2m away. If I could, I'd start saving now already. I would however make one change for my own system, and that is to change the Beyma bass drivers out for Altec GPA 414 or 416 16-ohm alnico units. The box might need to be enlargened for these, but hey. I just think the Altec alnicos just have a magic all their own.
Enjoy,
Deon
Yes, it is definitely one that caught my eye. I can't say I'm saving up for it, though, because my listening space is such that I won't be able to move the required minimum listening distance of 2m away.
If I could, I'd start saving now already. I would however make one change for my own system, and that is to change the Beyma bass drivers out for Altec GPA 414 or 416 16-ohm alnico units. The box might need to be enlargened for these, but hey. I just think the Altec alnicos just have a magic all their own.Enjoy,
Deon
Recommendations so far:
10inch Celestion TF1020
10inch Fane 10-300 http://www.faneinternational.com/downloads/FANE_Sovereign_10300_Specs.pdf
10inch Seas A26RE4 Europe Audio
8inch Eminence Beta 8 http://www.eminence.com/pdf/Beta_8A.pdf
6inch Eminence Alpha 6 http://www.eminence.com/pdf/Alpha_6C.pdf
Important questions for this enquiring mind:
What are the benefits/concerns of 10, 8 & 6 inch drivers?
As I've only had experience with FR drivers, what are the requirements for driver integration?
Your indulgence is greatly appreciated
10inch Celestion TF1020
10inch Fane 10-300 http://www.faneinternational.com/downloads/FANE_Sovereign_10300_Specs.pdf
10inch Seas A26RE4 Europe Audio
8inch Eminence Beta 8 http://www.eminence.com/pdf/Beta_8A.pdf
6inch Eminence Alpha 6 http://www.eminence.com/pdf/Alpha_6C.pdf
Important questions for this enquiring mind:
What are the benefits/concerns of 10, 8 & 6 inch drivers?
As I've only had experience with FR drivers, what are the requirements for driver integration?
Your indulgence is greatly appreciated
JRKO, are you really thinking about building this monster or it mostly is an exercise?
That Fane driver looks quite good and is overall close to the Celestion in their parameters. It has a bit more magnet, but a slightly heavier cone. Price looks ballpark for both units as well.
The SEAS unit is more of a sealed box woofer judging form the low Fs and its sensitivity might be a bit low for such an application IMO.
FWIW, I'm currently using the Celestion TF1020 in some small MLTL's along with the Dayton 10" round WG witih D220Ti and it's a nice match sonically, for dispersion and visually to boot! This WG or another type with constant directivity might be good here and the "modern" thing to do. If really going for a 4-way setup with each channel doing ~ a decade, the midrange might be good for 150Hz to 1.5kHz, where the CD-WG will follow up to 15kHz and a nice super tweeter would do the rest up to 20kHz or wherever it ends. I would highly suggest an active crossover in this case.
A 10 liters sealed box puts the TF1020's f3~150Hz and Qtc~0.7 and I assume it would not be far off for the Fane. A 2nd order high-pass around there would allow for 128W before exceding Xmax for an SPL of ~117dB.
I'm not too sure what to recommend for a big bass driver, as I don't have much experience outside of the TD15M that I recently got, which might be a bit expensive for this here project, though very well worth their price.
IG
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The Alpha 6 is "OK", but not the driver that the Beta 8 is. Choose the Beta 8 over its smaller brother.
I would suggest you go damped open back for the mid. You could use a small sealed box, but the heavily damped open back sounds better to my ear.
The nice thing about using an 8" cone for the mid is that there are so many. You could midrange driver roll to your heart's content. New, old, cheap, expensive, plain, fancy - there is plenty of room to play.
I would suggest you go damped open back for the mid. You could use a small sealed box, but the heavily damped open back sounds better to my ear.
The nice thing about using an 8" cone for the mid is that there are so many. You could midrange driver roll to your heart's content. New, old, cheap, expensive, plain, fancy - there is plenty of room to play.
medium? medium? You crack me up Cal - you're one serious BIG speaker connoisseur
Connoisseur, hmm...that sounds much better than speakerholic or speaker pig. Thanks.
This is an love affair that produced a dream. That dream is motivating this exercise. This exercise will lead to a pair of monsters in my living room
I've built LARGE before btw (see below for 3cuft for 12lta & 7.5cuft for Beta15) . Larger in fact that this project will be!
The Celestion certainly looks the smoother of the two over the 200-2khz range it would be used for.
I like the idea of the Selenium driver. Really good value, even here in the U.K.
Can anyone explain the virtues of picking a smaller mid driver than a 10 incher. I can't seem to understand the issues involved
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The larger driver will start to beam lower. (Pano beat me to it
) IIRC from my measurements, the TF1020 had good 60° dispersion up to ~1.5kHz. An 8" driver might make it a bit higher, if wide and even dispersion is a goal of this project, but otherwise, TF1020 makes it to ~2.5kHz before its first breakup, so you'd be good for your 200Hz-2kHz range with it.IG
ok - 'beaming' - is that where the driver, at a certain freq. and above, becomes more & more directional thus narrowing the 'sweetspot'?
Cal the Connoseur, with cone break-up you've thrown another hat into the ring. To my sadly lacking mental faculty, I would have though that means the cone distorting at lower freq.?
Cal the Connoseur
, with cone break-up you've thrown another hat into the ring. To my sadly lacking mental faculty, I would have though that means the cone distorting at lower freq.?
ok - 'beaming' - is that where the driver, at a certain freq. and above, becomes more & more directional thus narrowing the 'sweetspot'?
Cal the Connoseur
Yes, beaming is the reduction in dispersion angle as the wavelenghts get smaller than the cone diameter. It's a bit the same principle for breakup AFAIK, in the sense that when the wavelenghts get smaller than the cone radius, the cone is not moving in unison, aka pistonic movement. This will happen with all drivers, it's just that some will do it more gracefully and barely exhibit a thing on their response, while others will get large peaks and dips.
IG
just of general interest, the 8ohm 6A, or 4ohm 6C ?
at least on paper they appear to measure differently
around here I have only seen the 8ohm 6A in OB
Aha - so where the TF1020 freq response get ragged just over 2khz this is breakup as the cone is used to produce freq. smaller than its diameter and thus outside its ideal 'zone'?
Breakup and beaming are separate issues but are both results of the freq. wavelength being smaller than the cones diameter and thus ending pure pistonic motion
So as long as the driver is used within the smoothest part of the freq. response graph it should be fine.
Is there a list somewhere of wavelength 'sizes'? What specs will show the drivers dispersion? I'm slowly making my way thru http://www.diyaudio.com/forums/mult...ispersion-normal-living-room-environment.html
The 8 inch driver seems like a good idea being smaller and in the Alpha8 really clean but the TF1020 looks like it can handle 2khz just fine and would push more air
Breakup and beaming are separate issues but are both results of the freq. wavelength being smaller than the cones diameter and thus ending pure pistonic motion
So as long as the driver is used within the smoothest part of the freq. response graph it should be fine.
Is there a list somewhere of wavelength 'sizes'? What specs will show the drivers dispersion? I'm slowly making my way thru http://www.diyaudio.com/forums/mult...ispersion-normal-living-room-environment.html
The 8 inch driver seems like a good idea being smaller and in the Alpha8 really clean but the TF1020 looks like it can handle 2khz just fine and would push more air
At least this is how I understand it to work - there are folks way more knowledgeable than me who are welcome to correct any idiocies that I may spit out!
wavelenght = speed of sound divided by frequency. For c=343m/s and 1kHz, 343/1000=34.3cm, for example.
I bought my TF1020 based on the low sale price at the time and this guy's (stevie) comment on it, no direct test results, so has to be taken FWIW:
http://forum.speakerplans.com/celestion-truvox-tf1020-for-mid_topic31342_post354373.html#354373
IG
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Cal the Connoseur
then it might be time to throw in another hat...BSC
then it might be time to throw in another hat...BSC
Assuming an active Xover and a large-*** enclosure as this might result in, BSC might be a non-issue.
IG
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