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Stacked Quad ESL-57 with high pass??

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Any comments about using high pass filter at 80Hz on stacked Quad ESL-57 via digital crossover such as miniDSP Flex series??

I want to use Dipole bass (eg. GR Research Triple Threats) under 80Hz.

Follow Ups:

RE: Stacked Quad ESL-57 with high pass?? - 13th Duke of Wymbourne 18:19:58 01/22/24 (2)
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
- 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.........
RE: Stacked Quad ESL-57 with high pass?? - 6bq5 16:22:17 01/22/24 (0)
I would set the filter at 100Hz
Happy Listening
RE: Stacked Quad ESL-57 with high pass?? - hahax@verizon.net 20:55:12 01/21/24 (7)
I've heard the ESL-63 with a high pass at 300 Hz still maintaining the ESL magic but with much improved dynamics. In this case God is in the details of how well you did it(and the design of the bass speaker).
- RE: Stacked Quad ESL-57 with high pass?? - pushpulltriode 10:48:25 01/22/24 (6)
  300Hz is too high, localization is an issue other than colouration on the midrange. I never added a subwoofer to my Quad ESL system. However, the advancements of room eq and digital crossover has dramatically improved that help the blending between the subwoofer and Quad ESL at 80Hz.
  
  Especially the quality of Dipole bass is awesome these days. So I wonder whether anyone out there work on dipole bass and Quad ESL 57 setup.
  - RE: Stacked Quad ESL-57 with high pass?? - hahax@verizon.net 20:48:02 01/22/24 (5)
    I only heard it once for a few hours. I was impressed. My friend was very good technically with speaker design including things like dispersion and low distortion. By the way I was surprised when he told me how high the crossover was.
    
    Edits: 01/22/24
    - I agree with PPT - Story 02:37:17 01/23/24 (4)
      100 hz is what I use and after experimenting for 5 years that is the highest anyone should use.
      - RE: I agree with PPT - hahax@verizon.net 02:47:07 01/23/24 (3)
        
        In Reply to: RE: I agree with PPT posted by Story on January 23, 2024 at 02:37:17
        
        My friend was concerned with taking as much load as possible off the Quads so he could push the overall system harder and handle large transients.
        
        there will always be a limitation - Story 03:15:47 01/23/24 (2)
        
        In Reply to: RE: I agree with PPT posted by hahax@verizon.net on January 23, 2024 at 02:47:07
        
        and I should have added that the slopes should always be minimal i.e. first order and 6 db/octave for the best sound. My next experiment I may try a series crossover instead of parallel. When I used it years ago with dynamic drivers it was clearly superior
        
        If you want greater volume output use 2 Quads for each channel. It's vicious circle
        
        It's all about diaphragm area - E-Stat 06:18:17 01/26/24 (1)
        
        In Reply to: RE: there will always be a limitation posted by Story on January 23, 2024 at 03:15:47
        
        If you want greater volume output use 2 Quads for each channel. It's vicious circle
        
        Having the equivalent of four per channel with U790s obviates the need for a sub. ;)
        
        RE: It's all about diaphragm area - kentaja 09:01:42 01/26/24 (0)
        
        In Reply to: RE: It's all about diaphragm area posted by E-Stat on January 26, 2024 at 06:18:17
        
        Even if stacked four high subs will be required if one wishes to have the bottom octave.
        
        Sure the mid, upper bass will be as outrageous as the SL but it still won't do the bottom octave.
        
        I've heard them stacked 3 high. Oh yeah they have as much boogey, slam, scale as the U745/90 but......

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