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Robbie010

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  • My System
    Clone La Scala (Crites CT120 Tweeters)
    Hypex Fusion FA123 DSP Plate Amps
    Pro-ject RPM 6.1sb / Dynavector DV-20X2
    Bluesound Vault

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  1. Thanks to all for the responses. Can I ask what subs you are using @baron167?
  2. Now that I have gone active with my clone La Scala, overall sensitivity and crossovers are no longer a concern and a world of driver options has opened up to me. I have already installed Crites CT120 Tweeters, which has given the top end a real boost and clarity. This has got me thinking..... is there a drop-in 15” woofer driver on the market that will replace the stock K33’s and get me closer to 20Hz without needing physical alterations to the cabs?
  3. PM sent, Chris. Thanks. A little more playing around with the gains and delays has got me to this point:
  4. Hi Chris, See the new spectograph below, this has been done with only the basic crossover filters applied but I'm struggling to smooth out the kink at 3,000Hz and there is the small dogs leg between 200Hz & 400Hz. Is there any insight you can gain from the graph??
  5. Thanks, Chris. I’ll drop you a line for the email address, it will be interesting to get an opinion on the filters. When it come to dealing with the delays, is better to use a full frequency sweep done at 1m or at the LP?
  6. I had a play around today with the spectograph and delays in the new version of REW and managed to get to here: I'm not sure where to go from here, even small changes to the timings seem to make the spectograph worse from here........
  7. Thanks, Chris. I've downloaded the beta. I've just re-read your basic guide (below) and I think I may have gone wrong at the outset....... I started from scratch this morning and the process I went through was as follows: First, I loaded the basic crossover points for each driver, first order 400Hz low pass (inverted) for the woofer, first order 400Hz high pass for the midrange and first order 4,500Hz high pass for the tweeter. All good. I then set the umik mic at 1m from the speaker, at my listening position ear height for the woofer and took a sweep within a limited frequency range of 20Hz - 2,000Hz and flattened its response using REW. I then did the same thing for the midrange, mic at 1m from the midrange horn, sweep between 200Hz - 8,000Hz and flattened the response and again for the tweeter, mic at 1m from the tweeter, sweep from 1,000Hz - 20,000Hz. However, I struggled with the levels. Prior to making each individual sweep, I tried to set the levels for each driver at 75db using the pink noise test tone in REW and I used the volume control on the plate amplifiers to level match as far as practical. However, whenever I used my digital sound meter at the mic location to confirm the levels, they were all over the place. What is the correct way to complete these first steps? Should I to set the level with all drivers playing and then simply mute two of the drivers and run a sweep on one driver at a time, without any further level changes, or was my method the right way to do it? 🥴
  8. There must be some differences between my version of REW and yours, I can't get my scales to match up to yours at all. What version of REW do you use?
  9. Ah Ha! 😃 Here is a new graph with a 1.5ms delay added to the tweeter......... it looks to like a further 0.5ms may bring that further in line, which I assume is what I'm aiming for!?
  10. Its going to take me a while to get to grips with all these graphs and how to read them...... here is the group delay plot:
  11. After setting the impulse response to 0 and smoothing to 1/6 the graph looks like this. The little dogs leg is at almost exactly 400Hz Also, the frequency scale is set to db SPL but I cant seem to get the scale to change.
  12. Help! 🤪 After more than an hour I have managed to produce a spectrograph that resembles @Chris A's, however, its dissimilar enough for me to have no idea how to interpret it.... Crossover points are 400Hz & 4900Hz Have I gone wrong here? Can you please educate me on how to interpret this and what kind of delays are needed:
  13. I'm sure its a silly question but here we go........what effect can cabinet fillings have on the frequency response of a speaker?? Can adding a filler material to a bass cabinet have a substantial effect on the lower frequency response of a speaker, such as the la scala. More specifically, could one use cabinet filling to help deal with speaker boundry issue?
  14. Hi Chris! Me again..........😄 I've been having a play with the crossover you sent me and playing around with REW........ it very interesting stuff, even for a novice like me. One thing I was just trying to get my head around was regarding the Delays and Gains. I am assuming these are set based upon the physical dimensions / layout of the speaker drivers and their overall response. If that is the case, can I simply apply these same settings to pretty much any crossover I may wish to design and have the correct delays and gains?? Thanks in advance.
  15. Thanks again Chris! We had a play this afternoon and have tweaked some of the filters as dictated by the REW measurements! All of the graphs show a hefty 15db null at 106Hz: Any guidance on whether this null can be corrected using the HFD software and how would be much appreciated!
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