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Part Fourteen

April 2011 - Elsinore Mk5 - some details below are obsolete.

Needs updating as info below applies to Mark 1 version of Elsinores.

For details pertaining to Mark 2 & 3: Elsinore Mk 2 & 3 Crossover & Notes


Tweaking the Crossover

There may be some reasons to tweak the crossover. 

  1. Some Amplifiers have High Output Impedance (frequency response is modulated)

  2. Speakers used in acoustic environment that is deader than normal

  3. Speakers used in acoustic environment that is brighter than normal

  4. Some users may like slightly more vocal projection.

  5. Voicing the balance, maybe useful for troublesome rooms

First look at the crossover and suggestions below that.

Please Note, only Elsinore Mark 1 Crossover

The recommended order of component's values that could be tweaked are as follows:

R3 This can be reduced to below 1R, especially if using Nomex coned  drivers.

R1 When the amplifier has high output impedance, such a single ended tube amps or amps that have zero feedback. If R1 is decreased to below 10R - but never below 5R - then R3 will have to be reduced to zero, that is just a wire and not a resistor. Under these circumstances, reducing R3 will counter a drop in the response above 2KHz and likewise the shortened R3 will match that out put.

L3 Reducing this value will increase vocal projection, but it should not be below 0.5mH - and R1 should now be changed with increasing care (maybe best not changed). Try 0.8mH first.

L1 Reducing this value was found to lessen the overall "ripeness" of the speaker. This is of course a tonal subjectivity and a voicing of the speaker. This could also be useful for smaller rooms where the powerful sound of the Elsinores can be a problem. Try 5-6mH.

It is not recommended that any of the other component values be changed. This would largely necessitate a modelling program from scratch (the parallel networks are tuned to critical frequencies). The above tweaks are only useful because of the sonic changes that can be expected.

 

 

Total Design Responsibility, Joe Rasmussen of Custom Analogue Audio & JLTi

Part Financial Sponsor & Prototype Box Construction, Bernard Chambers of Sutherland

Sounding Boards, Michael Lenehan of Lenehan Acoustics & Brad Serhan of Orpheus Loudspeakers


 

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Copyright 2003-10 Joe Rasmussen & JLTi
Last modified: Sunday January 05, 2014

Just had a terrible thought. If "intelligent design" is unscientific, then who will design our audio equipment?