Jump to content

Maz4bz

Regulars
  • Posts

    95
  • Joined

  • Last visited

Profile Information

  • Location
    Australia
  • My System
    Alpine SWR 1522 DIY Budget Build Sub
    Alpine SWR 1540 DIY Budget Build Sub

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

Maz4bz's Achievements

Advanced Member

Advanced Member (3/9)

38

Reputation

  1. It looks ideal in theory - I'm modelling using my KG 5.5 measurements. We need YOUR KG4 measurements for this to work. Without your measurements this is all just guess work. 🧐
  2. Probably I'd be aiming for around 10mh....
  3. All good Matt, I would still be interested in your objectives here. Mine are to get the smoothest on and off axis response possible with highest efficiency - without too much cost in crossover parts. Updated now with 0.2mh on the .5 woofer....
  4. Hi Matt, I wonder if I've missed something here but I am wondering what's your objective(s) here? When I saw that 500mh inductor on the lower woofer I figured I might model that and show what that kind of value is going to have on your system. So what I've done here is use Xsim and the measurements for my KG 5.5's to show what I mean. So obviously this isn't exactly what your KG4 will be doing. To model your KG4 accurately we'd need your frequency response measurements. But seeing as we don't it is still useful as an exercise to underscore that changing the crossover without measurements is, well, lets say problematic. Here is your modded crossover as I've translated it into Xsim.... Here's the modelled impedance curve (using KG 5.5 data).... Here's the modelled frequency response - black = system; yellow = tweeter; blue = upper woofer; green = lower woofer... So, that lower woofer is playing 40 db down. When I first modelled this I had the vertical scale set to 5db and thought I'd made a mistake because the lower woofer curve was missing! 40db down means it may as well not be connected. You won't hear anything from it! Plus that's a very expensive inductor if you can buy one? Not that you would want to. For comparisson sake here's the original KG4 crossover using my KG 5.5 data - purely acedemic naturally but thought I'd show it for completeness.... So back to my question, what's your objective here? Checking the impedance for its minimum is great for ensuring you're amp is going to be safe, but the impedance is just a small part of the picture. Without frequency response measurements I'm at a loss as to how you'll be able to arrive at a remotely workable crossover? I apologise if I am coming across as negative. That's not my intention. Cheers. 🍻
  5. I forgot you said you have the DATS - that's great! No idea how much mass to add but it'll be easy for you to determine. To do this measure a woofer with DATS and use the T&S specs you get with Hornresp or WinISD etc to model up the Dayton PR to get you how much mass to add to it. You could then use your mic to measure the speaker to compare modelled with the actual result to fine tune. Would be great for you to post the T&S data you take from your MidWest Audio 8" woofers into the Klipsch Impedance Curves thread for others to find too. Good luck! 🍻
  6. Looking fantastic Matt! Seeing as you've changed the woofers perhaps if you have trouble finding original passive radiators you might simply purchase a Dayton PR to fit and a calibrated mic so you can tune the PR to your taste but with a little data to help you dial in what you're hearing? The mic will take out the guess work and if you haul a cabinet outside you can easily take ground plane measurements to accurately verify your results. You could even use an Audyssey mic plugged into your PC with REW and get an accurate result - I've tried this and it works great. Good luck! 🍻 ...
  7. Dear all, another minor update - more data. I wanted to confirm the modelled WinISD bass response using the DATS measurements I'd taken from the woofers. Here's the modelled response of the two KG woofers showing a tuning frequency in the high 40hz with a 2.5db hump above this.... I recently had a chance to haul one of my KG's outside for some ground plain measurements. I wanted to see how the modelling compared to measured... This measurement approach enables a more accurate measurement of the bass response of a system. These are done at 1m with Omnimic.... Next is a series of distortion measurements at 5db intervals with reference to 100hz..... 95db: 100db: 105db: From this I think we can deduce that the 2.5 way alignment has strong bass response down to 30hz and is very clean/low distortion up to dangerously high SPL - remembering permanent hearing damage onset is 87db. In the years I've had my KG's I've had numerous speaker systems through my home, but I keep coming back to the KG's. They remain my reference speaker. 🙂 Cheers. 🍻
  8. I have this horn with a P-Audio BM-D450S. The horn is very well constructed. Measurements: Horizontal... Vertical: Distortion Energy storage Measurement setup - Omnimic with 5ms gating, driving an AX-550 with mic at 1m with turntable graduated in 10 degree increments.... BM-D450SMKII.pdf
  9. Maz4bz

    KG4 or KG5.5

    I'm a bit late to this thread but wanted to add that the KG5.5's can be absolutely superb loud speakers....
  10. KG5.5's are fine loud speakers that can be relatively easily upgraded into exceptional performers in my opinion....
  11. G'day Trong, The crossover order won't affect the efficiency, but the conversion to a 2.5 way crossover most certainly does. This is because the lower woofer now rolls off early leaving the upper woofer to handle the rest of the frequency range up to crossover point with the tweeter. In theory this change reduces the overall system efficiency by 3db. Oh and I don't believe this system was ever 98db, more like 93 in the low end, about 96 above crossover in original spec. Mine are about 90db now which is still quite efficient by non-horn loaded speaker standards. Cheers. 🍻
  12. The crossover is EVERYTHING to the final sound. As Dr Geddes says, drivers are commodity products, and that he can make any sound relatively great with a well designed crossover. Don't kid yourself that you can change the crossover effectively without measurements. This is like trying to drive a car with the windscreen blanked out. You can operate the contolls but you have no real way of knowing where you are going! Get some measurement gear. Post your measurements. There are many here that can help you once you start posting data and being scientific. Hang in there it's well worth the effort.
  13. Hi VDS, The crossover is what I think of as the soul of your speaker "system". I say system because all the parts of the speaker, including the cabinet and how the drivers are arranged in the cabinet form that system. If you change anything, you are likely going to need to revise the crossover. To do crossover modifications you must measure the speaker. To do this you need a mic and some software. Considering the cost of drivers and crossover parts the outlay (to me) is relatively small and can reap major benefits, ie help you find the true potential of your system. Once you've measured your system you need to get those measurements in to a crossover design software such as XSim or VituixCAD and begin designing. There's a learning curve for sure, but once you get through the jargon and understand the process its actually quite straight forward. Both of those threads are great places to understand it all. I have been through this process with my lovely KG 5.5's. The effort was well worth the improvement, to me. 😉 Good luck. 🍻
  14. Hi Randall, I'm no electronic engineer however I think the simple answer is yes, assuming that pot can dissipate the electrical load adequately. However I would only do this for R2 which gives the ability to tune the slope of the tweeters response. I would not replace or change R3. This would raise (or lower) the entire output of the tweeter and create a situation similar to the stock crossover where there would be a step up (or down) in the frequency response at crossover like this.... This would degrade the on and off axis response, which we want to avoid. You would see this in the polar response with a sharp break in directivity something like this .... Good luck and please post back what you find. Cheers. 🍻
  15. Hi Greg, Yes you certainly can add the resistor at the tweeter +ve. I created resistor modules of various values that I simply plugged in at the tweeter so I could easily adjust the attenuation on my KG 5.5s tweeter. Once I arrived at a sound I liked I just left that module in place. Regarding the deadening I'd suggest just doing one and then A-Bing the modded with unmodified speaker side by side - can you hear any difference? Good luck and let us know how you get on. Cheers.
×
×
  • Create New...