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RE: Stacked Quad ESL-57 with high pass??

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13th Duke of Wymbourne

In Reply to: RE: Stacked Quad ESL-57 with high pass?? posted by pushpulltriode on January 21, 2024 at 14:09:30

I plan on something similar. What I would do is to play those pieces with strong bass that cause the 57s to creak or complain at high volume. Using the volume level you would like to listen at but are afraid of over-driving the 57s, add a 4th-order high-pass filter in the mini-DSP and slowly increase the corner frequency from, say 40Hz, upwards until there is no longer any creaking and set that as your corner. That will give you the widest, trouble-free range on the 57s. Also, you could use REW to see if where the panels start rolling off and add a little DSP boost there to flatten things before the sharp high-pass cut-off.

Edits: 01/22/24

Follow Ups:

RE: Stacked Quad ESL-57 with high pass?? - kentaja 10:55:51 01/23/24 (1)
A properly functioning pair of original Quads will easily hit 100dB peaks. And with proper amplification it will hit those kind of levels without any signs of stress even with heavy bass content. I'm a head banger and like to hit 100dB+ levels at times. And I certainly like music with heavy bass content.

For the typical Quad owner, even me, it's really not a question of loudness or dynamics it's a question of bass extension. The original Quad produces virtually nothing in the bottom octave. While I am satisfied there are times I would like the bottom octave.

Why people want to cross so high is a mystery to me. What's the point? 100Hz is still too high it will impact the midrange unless one uses an extremely steep slop on the sub.

40Hz. Let the Quad run full range and blend in the subs around 40Hz. Done properly it will be seamless no need for open baffle, dipole, etc. type designs. It doesn't screw up the midrange the beautiful mid/upper bass region is intact and now one has the bottom octave.

Of course if the Quad in question is old there won't be much below 100Hz any longer so then yes cross at 100Hz.
- RE: Stacked Quad ESL-57 with high pass?? - sailor321 07:39:53 01/31/24 (0)
  This is how I run my ESL's., full range with a pair of Janis W1 set at 40Hz and below. With the clamping circuit from Ken at EStat I have no fear in playing at high levels
  So it goes.........

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