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JBL E155-4 [message #34006] Thu, 04 October 2001 01:44 Go to next message
Frode is currently offline  Frode
Messages: 49
Registered: May 2009
Baron
Hi Wayne!
Do you know this driver? Is it possible to use it as a sub? I can get a good deal on one driver.

Regards
Frode

Re: JBL E155-4 [message #34008 is a reply to message #34006] Thu, 04 October 2001 06:59 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18791
Registered: January 2001
Illuminati (33rd Degree)
It's a powerful woofer, but by today's standards I don't know that I would call it a sub. You can certainly tune it for subwoofer frequencies but I'd consider it a wide range midwoofer. If you want a good JBL subwoofer, try a 2235 or 2245.
Re: JBL E155-4 [message #34010 is a reply to message #34006] Thu, 04 October 2001 08:47 Go to previous messageGo to next message
Harald is currently offline  Harald
Messages: 8
Registered: May 2009
Esquire
Perhaps this is helpful:

http://www.jblpro.com/pages/pub/components/eseries.pdf

Re: JBL E155-4 [message #34012 is a reply to message #34008] Thu, 04 October 2001 13:16 Go to previous messageGo to next message
Frode is currently offline  Frode
Messages: 49
Registered: May 2009
Baron
Hello again!

The 2235H is very interesting, but it seems to be difficult to get around here (Norway). I've seen some at Ebay, but many sellers don't want to ship outside USA. Besides, I guess the shipping would be almost the same as the driver. I also have to pay 24% tax on both driver and shipping. A new 2245H might turn out to be cheaper but the box would have to be larger than I like. To augment my 4Pi 2226H, how small could I build a box for the 2245H?

TIA
Frode

Re: JBL E155-4 [message #34013 is a reply to message #34012] Thu, 04 October 2001 15:46 Go to previous messageGo to next message
Wayne_Parham is currently offline  Wayne_Parham
Messages: 123
Registered: May 2009
Master
The thing is, the smaller the box, the higher the cutoff. You can put a 2245 in a 4 cubic foot box but then it's not what I'd call a subwoofer, with f3 of 50Hz. Best to put it in an 8 - 10 cubic foot box tuned to 30Hz, which gives deep response, with f3 of 33Hz and f10 of 25Hz in a 10 cubic foot box. There's plenty of excurison, so that's not a limit through the entire passband. The thermal limit puts maximum output around 120dB at 1 meter. Naturally, excursion becomes a limit below fl, so high pass at 20Hz.
Re: JBL E155-4 [message #34014 is a reply to message #34013] Sat, 06 October 2001 09:21 Go to previous messageGo to next message
Frode is currently offline  Frode
Messages: 49
Registered: May 2009
Baron
My question is, how can you tell if response curve "sounds good", and how do you tell if the distortion is low? Some drivers goes pretty low with a "normal" roll-off, while others need an alignment which gives some kind of extended shelf in the response to give low bass. Is everything "OK" as long as the curve is smooth, or should I look for something else?
Re: JBL E155-4 [message #34016 is a reply to message #34014] Sat, 06 October 2001 14:40 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18791
Registered: January 2001
Illuminati (33rd Degree)
You cannot tell what distortion is from a response curve. You will have to get these specifications from the manufacturer or measure them yourself. Driver motion becomes increasingly nonlinear as excursion is increased, so it is an important consideration. The amount of this imperfection is according to motor properties and suspension, so quality is important.
Re: JBL E155-4 [message #34018 is a reply to message #34016] Sun, 07 October 2001 02:03 Go to previous messageGo to next message
Frode is currently offline  Frode
Messages: 49
Registered: May 2009
Baron
How are the JBL's in distortion?

TIA
Frode

Re: JBL E155-4 [message #34021 is a reply to message #34018] Sun, 07 October 2001 09:01 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18791
Registered: January 2001
Illuminati (33rd Degree)
Lowest distortion of any brand I've used. JBL is the leader in this regard, incorporating shorting rings that reduce distortion 50-100x (15-20dB) from 50Hz up.
Re: JBL E155-4 [message #34025 is a reply to message #34021] Mon, 08 October 2001 08:59 Go to previous message
juanstein is currently offline  juanstein
Messages: 10
Registered: May 2009
Chancellor
Hi Wayne,

Another low frequency, very high quality sound reinforcement option, particularly for European DIYers, has always been Tannoy. Tannoy doesn't list their raw drivers on the website (www.tannoy.com), but does list the part numbers of drivers used in their sound reinforcement products. All of these drivers are available from a licensed Tannoy professional dealer or directly from Tannoy. Check the B475 or B950 Tannoy subwoofers, and compare against a JBL SR4718 and SR4719 for a quick guesstimate on tuning for the drivers in a comparably sized enclosure. The driver tuning seems to be a fair bit lower (maybe as much as 9-10 Hz), at the expense of some power handling. I don't know how the two would compare at the lower midrange and higher, but we are talking about low frequency augmentation speaker. Also, from the price of finished Tannoy subs, ~1100 US$, I suspect the prices may be more competitive than TAD. Just another option to consider.

Disclaimer: I have not yet heard the Tannoy B475 or B950 subwoofers, but have heard the T12, I12, D900, D700, D500, Saturn 10, and Saturn 8. They are all killer. I purchased the T12 used for sound reinforcement work. So yes, I am blissfully biased.

Cheers Wayne!

P.S. Thank you for all the information you continue to provide for free. I am looking forward to seeing your final copy of the crossover paper. Someday, when I can afford to build up my shop tool set, I am going to be another speaker cutting fool.

John

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