Using Lambda woofers up high

Posted by Duke (D) on September 24, 2002 at 17:54:37

In Reply to: Re: high end wide range bass drivers posted by thylantyr on September 24, 2002 at 11:01:46:

thylantyr -

While it's true that 15" Lambda woofers can be used as high as 2000 Hz, the highest crossover point I've heard of anyone using is 1500 Hz. I'd personally rather keep it around 1000 Hz or less, due to the inevitable narrowing of the radiation pattern at higher frequencies. And in a high-resolution application crossing over above balllpark 300 Hz, the Apollo upgrade is strongly recommended.

If you click on the link below and scroll down, you'll see that the response is within plus or minus 1.5 dB from 200 Hz (the lower limit of the graph) up to about 1200 Hz, over a coverage angle of up to 45 degrees off axis. At higher frequencies the beaming becomes pretty severe. The +5 dB on-axis hump centered on about 2.2 kHz is pretty good for such a big cone, and the woofer's on-axis upper -3 dB point of 4.5 kHz is unusually high for such a large woofer. Few 12" woofers extend up this high.

Note also how the impedance curve remains below 16 ohms all the way up to 6 kHz - this is due to the unusually low inductance of .3 millihenries. This contributes to the wide bandwidth of the driver, because in most woofers the voice coil's inductance acts as a low-pass filter and rolls off the top end.

Note that while some of the driver's parameters have changed since those graphs were recorded, the cone is still the same. If anything, the upper end is a bit more extended on current production models.

Disclaimer - I use Lambda woofers in custom systems.

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Follow Ups Full Thread

Topic - high end wide range bass drivers - rick57 00:57:08 09/24/02 (18)

Re: high end wide range bass drivers - thylantyr 11:01:46 09/24/02 (6)

Using Lambda woofers up high - Duke 09/24/0217:54:37 09/24/02 (5)

Re: Using Lambda woofers up high - thylantyr 22:01:03 09/24/02 (4)

a couple of Lambda comparisons - Duke 06:13:46 09/25/02 (1)

Re: a couple of Lambda comparisons - thylantyr 07:43:31 09/25/02 (0)

Re: Using Lambda woofers up high - rick57 22:35:06 09/24/02 (1)

Re: Using Lambda woofers up high - thylantyr 07:47:13 09/25/02 (0)

Re: high end' full range bass drivers - Magnetar 04:22:18 09/24/02 (6)

Re: high end' full range bass drivers - rick57 22:25:37 09/24/02 (1)

Re: high end' full range bass drivers - Magnetar 06:49:17 09/25/02 (0)

Another PHL open back bass and mid - Edp 07:17:32 09/24/02 (3)

Re: Another PHL open back bass and mid - Magnetar 06:57:39 09/25/02 (0)

Re: Another PHL open back bass and mid - rick57 22:32:06 09/24/02 (1)

Re: Another PHL open back bass and mid - Edp 07:13:49 09/25/02 (0)

Something's gotta give... - Duke 03:26:21 09/24/02 (3)

Re: Something's gotta give... - rick57 22:11:27 09/24/02 (1)

parameters that establish woofer efficiency - Duke 12:48:06 09/25/02 (0)

Re:"In my opinion, good dynamics is worth trading off extension for" - mvwine 06:44:18 09/24/02 (0)

Follow Ups

Using Lambda woofers up high - Duke 09/24/0217:54:37 09/24/02 (5)

Re: Using Lambda woofers up high - thylantyr 22:01:03 09/24/02 (4)

a couple of Lambda comparisons - Duke 06:13:46 09/25/02 (1)

Re: a couple of Lambda comparisons - thylantyr 07:43:31 09/25/02 (0)

Re: Using Lambda woofers up high - rick57 22:35:06 09/24/02 (1)

Re: Using Lambda woofers up high - thylantyr 07:47:13 09/25/02 (0)

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