First system, D130 + LE175 - hollowboy - High Efficiency Speaker Asylum

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First system, D130 + LE175

211.28.180.175

In Reply to: Re: great goal, incompatible objectives posted by rickyd on April 7, 2007 at 18:47:50:

This exact combo of D130 bass and 175 compression driver has been done before. See link :)
Some people use LE175's right down to about 500Hz. Bruce Edgar (well-regarded professional horn builder) is more conservative, and has said:
"All the JBL 1" drivers (LE175, 2420) from that era will only work from 1-10kHz according to my measurements."
The D130 should be happy running as high as 2KHz, so you have plenty of overlap. Some enthusiasts use them down as low as 50Hz. Bill Fitzmaurice (another professional and font of useful info) is more conservative, and has said:
"this is a guitar driver, designed to work from 100Hz and up. You can horn load it to be good to 50Hz or so, T/S load it to maybe 80 Hz with a lot of ripple..."
...so if these two drivers are the basis of your system, you should be doing very well for 100Hz to 10KHz, and your 1200Hz X-over should be fine.
IMO, to use bi-amped Altec, or Jensen 16" speakers to fill in <100Hz would be a waste. Altec bass drivers, in particular, are prized for their wide band operation, rather than for use as pure low bass drivers. I'd suggest getting a modern driver (or drivers, plural) to handle 100Hz and under.
If it was my system, I'd build partly modular cabinets for them: the D130 and LE175 horn would go in a sealed cab, just big enough to house the parts (approx 40cm wide*40cm deep*60cm high). These cabinet would stack onto the bass box, to put it at ear level, and I'd get a cute super tweeter for the very top.
Here's another link, a mention of the D130A + LE175 + N1200 combo.
http://www.roger-russell.com/mysound/mysound.htm

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Follow Ups Full Thread

Topic - First HE speaker project - rickyd 17:02:10 04/07/07 (12)

Better curve of D130 - RCA-fan 12:10:51 04/10/07 (0)

curve of D130 - RCA-fan 19:22:38 04/09/07 (2)

Re: curve of D130 - freddyi 20:42:05 04/09/07 (1)

Re: curve of D130 - RCA-fan 05:10:49 04/10/07 (0)

Re: First HE speaker project - Paul Joppa 00:13:21 04/09/07 (0)

Re: First HE speaker project - jweiss 10:05:20 04/08/07 (0)

Mr. Rickyd: are your speakers 16ohms and are you proposing to add bass drivers? - -3db 21:06:07 04/07/07 (2)

Mr. Rickyd: you could add an Altec 803 to go real low. - -3db 13:43:02 04/10/07 (0)

Re: Mr. Rickyd: are your speakers 16ohms and are you proposing to add bass drivers? - rickyd 04:22:12 04/08/07 (0)

great goal, incompatible objectives - troporobo 18:25:55 04/07/07 (2)

Re: great goal, incompatible objectives - rickyd 18:47:50 04/07/07 (1)

First system, D130 + LE175 - hollowboy 20:07:57 04/07/07 (0)

Follow Ups

First system, D130 + LE175 - hollowboy 20:07:57 04/07/07 (0)

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