Thanks Macka for the response.
Better quality 25k linear trimpots might be useful, but I think I've got the response to the stage of using fixed Rs.
I've matched inputs/outputs for HP & LP stages on both boards using sine waves at various frequencies & a 2-channel oscilloscope.
Then confirmed into & out of both channels of all 3 amps.
Final confirmation was measurement sweeps with REW at 1cm from woofers, 50cm from each mid & tweet on axis. Final measurement at listening pos with sweeps & pink noise.
Confirmed with iPhone App that shows spectrum of actual music (new phone's mic is calibrated to the app).
Drivers are very closely matched for my NS1000s, variations are all due to room nodes/reflections.
Unbalanced is working fine with no hum or noise.
I make my own interconnects & know how to shield & terminate correctly (Rane Technical Note 100, i think, is my reference).
Phase measurement & matching is an aspect I'm still learning; I've been using REW for 5+ years & there are still "Ahah!" moments when something clicks.
The 6-24XO has replaced a fancy DSP-based XO (which is LR4 slopes, which don't sound as good as LR2), & sound quality (musicality) is superior, less "tiring".
So, apart from 50k trimpots, pretty happy.
May not need other 4 kitsets I bought to do full balanced build, so if anyone in Australia needs them, PM me (price will be my landed cost+postage).
Better quality 25k linear trimpots might be useful, but I think I've got the response to the stage of using fixed Rs.
I've matched inputs/outputs for HP & LP stages on both boards using sine waves at various frequencies & a 2-channel oscilloscope.
Then confirmed into & out of both channels of all 3 amps.
Final confirmation was measurement sweeps with REW at 1cm from woofers, 50cm from each mid & tweet on axis. Final measurement at listening pos with sweeps & pink noise.
Confirmed with iPhone App that shows spectrum of actual music (new phone's mic is calibrated to the app).
Drivers are very closely matched for my NS1000s, variations are all due to room nodes/reflections.
Unbalanced is working fine with no hum or noise.
I make my own interconnects & know how to shield & terminate correctly (Rane Technical Note 100, i think, is my reference).
Phase measurement & matching is an aspect I'm still learning; I've been using REW for 5+ years & there are still "Ahah!" moments when something clicks.
The 6-24XO has replaced a fancy DSP-based XO (which is LR4 slopes, which don't sound as good as LR2), & sound quality (musicality) is superior, less "tiring".
So, apart from 50k trimpots, pretty happy.
May not need other 4 kitsets I bought to do full balanced build, so if anyone in Australia needs them, PM me (price will be my landed cost+postage).
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listening to the Persuasions 'Stuck In A Moment You Can't Get Out Of' from Open Your Ears. It's like having a gaggle of singers across the loungeroom wall! Spooky!
to Mr.Pass #381
You have been diligent! Lots of new kits for the greedy boys.... 🙄
Thanks!
Dirk
You have been diligent! Lots of new kits for the greedy boys.... 🙄
Thanks!
Dirk
400 crossover kits (200 each ACN and 6-24) boxed up to ship to the store tomorrow.
Last kit's batch disappears quickly the best indicator how much this kits are popular and highly appreciated by Diyers.
Thanks Mr. Pass for all amazing work
I have been running my two way monitors (b&w cm5) with the analog crossover (2 pole) since the weekend and I must say I am very pleased with the result! First thing i noticed is that fading sounds like recording room echos and instruments seem far longer audible!
Measured frequency response is similar to the passive crossover (first order). However, 10k to 20k is rolled off compared to the passive crossover. Any clues on what might cause that?
Up next is trying 4 pole at a lower xover point.
Al this fiddling is in preparation of my first 2 way speaker project with Jbl2450 on yuichi horn (on order) and faital 15pr400[emoji16]
Measured frequency response is similar to the passive crossover (first order). However, 10k to 20k is rolled off compared to the passive crossover. Any clues on what might cause that?
Up next is trying 4 pole at a lower xover point.
Al this fiddling is in preparation of my first 2 way speaker project with Jbl2450 on yuichi horn (on order) and faital 15pr400[emoji16]
We would need to see the schematic of the stuffed board. The LXmini
does have an EQ circuit which may be in play in some way...
PASS XO CALC
Plug in 33nF or 47nF with all Rs of 22500 for 12dB/octave.
Play with values, you'll work it out.
Plug in 33nF or 47nF with all Rs of 22500 for 12dB/octave.
Play with values, you'll work it out.
Yes, for 12dB curves, C/2=C, & all Rs the same.
For 24dB, try the following:
HP R1=R3=17k R2=R4=34k, C1=C2=C3=C4=44nF (2x22nF in parallel)
LP R1=R2=R3=R4=34k, C1=C3=44nF, C2=c4=22nF
IME R values vary according to your actual drivers.
For 24dB, try the following:
HP R1=R3=17k R2=R4=34k, C1=C2=C3=C4=44nF (2x22nF in parallel)
LP R1=R2=R3=R4=34k, C1=C3=44nF, C2=c4=22nF
IME R values vary according to your actual drivers.
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if you use R=24k C=44nF (2x22nF) you can easily change to a 24dB curve by changing couple 44nF to 22 & doubling up filters. Simplifies cap ordering. Have fun (I did)