I just bought some vintage Heils (don't even have the ESS logo) and had previously built a cabinet with two RS225s in each wired in parallel. I was using Janszen electrostats on top but think the Heils have way more potential.
I am an audio nut but do not have a lot of crossover experience, only simple 1st and 2nd order types. One thing I did notice was how efficient the Heils were. They sounded really bright and think some attenuation L-pad will be required. I played them using a 40uh cap and some songs sounded harsh and somewhat hurt my ears, especially guitar distortion (Smashing Pumpkins). I have also seen threads about dampening the rear, I may try playing with that.
Many people say that Heils have no business being played below 1500hz or so, I am hoping perhaps my earlier versions can, and my existing RS225 crossover point will be ok as is, the inductor I bought for that was quite expensive.
Crossover design help would be greatly appreciated. All I would really know to do is use a crossover calculator and go from there. The Heils measure at 3.7 and 3.8 ohms.
I attached a few things:
•Schematic of the crossover I built for the RS225s, I believe I did a 2nd order Linkwitz-Riley and in looking at the values, and how the woofers measured in ohms, perhaps around 900-1000hz(?)
•REW sweep with the mic nearfield to one of the woofers (with my previously mentioned crossover) and then nearfield to the Heils (with no crossover but the sweep starting at 450hz).
•Pictures of the RS225 enclosures I built so you can visualize what I am trying to accomplish. I will most likely build a walnut block for them to sit on in the future.
I am an audio nut but do not have a lot of crossover experience, only simple 1st and 2nd order types. One thing I did notice was how efficient the Heils were. They sounded really bright and think some attenuation L-pad will be required. I played them using a 40uh cap and some songs sounded harsh and somewhat hurt my ears, especially guitar distortion (Smashing Pumpkins). I have also seen threads about dampening the rear, I may try playing with that.
Many people say that Heils have no business being played below 1500hz or so, I am hoping perhaps my earlier versions can, and my existing RS225 crossover point will be ok as is, the inductor I bought for that was quite expensive.
Crossover design help would be greatly appreciated. All I would really know to do is use a crossover calculator and go from there. The Heils measure at 3.7 and 3.8 ohms.
I attached a few things:
•Schematic of the crossover I built for the RS225s, I believe I did a 2nd order Linkwitz-Riley and in looking at the values, and how the woofers measured in ohms, perhaps around 900-1000hz(?)
•REW sweep with the mic nearfield to one of the woofers (with my previously mentioned crossover) and then nearfield to the Heils (with no crossover but the sweep starting at 450hz).
•Pictures of the RS225 enclosures I built so you can visualize what I am trying to accomplish. I will most likely build a walnut block for them to sit on in the future.
Attachments
It's been a while but I have a feeling the impedance on these is somewhat smooth.. so is the response to look at. You might be lucky to add an L-pad and filter with standard values and get close enough. Verifying the result with measurements is a good start. The next step may be using those in a simulator.
Taking the measurements too close can be a problem.
Taking the measurements too close can be a problem.
Yeah, having to pad down tweeter that much does irk.
Is your RS225 Alu version with lower sensitivity (86.8) than Paper (89.1dB)?
I have used dual Seas CURV U22Rex 8" (90.5dB) below the modern AMT great Heil crossed at 1kHz/18dB slope with great results..