I managed to find solution, after trying for a week 4-5 hrs daily!!
It was very simple! when you know how...
All point was to make right path of signal for Blu-link in London Architect! nothing more.
I`m listening M-2 I have no words!!!
I think I have found what I was looking for....
This is way for Bss Blu-50 that worked for me!
Is it OK??
Could anybody answer this?: What’s the reason for the -9 db hardware attenuation on the Mid-TW channel? Wouldn’t be more simple to just program a -9db attenuation on the digital crossover-amp and just use less power instead of burning it on two resistors? I really can not understand the logic of it, but sould be a reason. Thanks for any enlightment on this!
There are two main reasons AFAIK:
- The cap act as a 1st order high pass filter at 1kHz, a frequency around which the impedance of the D2/horn combo is far from flat. The lpad is essential here to linearize the impedance and get a predictable and stable result (you don't want to have to address the fs impedance peak using EQ in a production system)
- The lpad helps reducing the hiss/noise coming from the crown DSP and amplifier.
If you are using a quiet DSP/amp and can measure/adjust the EQ settings, then you go get away with a simple protection cap (around 200Hz, far away from fs to get a linear-ish impedance curve).
You could then also use an autoformer to reduce hiss (keep in mind that it will not linearize phase tho, and you will still have to shoot for a low corner frequency for the cap, and also take into account the impedance multiplication if you put the cap in front of the autoformer)
Thanks Pos for the answer. Bottom line, It would be more straightforward to just follow the original design. Do you know many watts are needed on the Hi-Freq amp? The amp is going to see only 20 ohms, so I guess we need a good amount.
Also, it’s strange the election of the 32 ohms version of the CD drive, instead of the “H” version (8 ohms?).
In this configuration the LF and HF amps should have the same gain.
The two diaphragms of the D2430 can be wired either in series (D2430K, 32 ohms nominal) or in parallel (D2430H, 8 ohms nominal) to accommodate a given design.
They chose the K wiring in the M2 to already reduce the sensitivity and hiss.
They would have to use a 15dB lpad instead of 9dB had they chose the D2430H in this design: 6 more dBs burnt in resistors for no additional benefit.
It looks OK to me. I'd go ahead and name my signals. I'd use a crossover instead of separate high and low pass filters, but it doesn't really matter. I've also found benefit when setting up control ports to have stereo equalizers, that way one control port can adjust both channels. You just set two channels instead of one in the properties, and drag your wires accordingly. None of this should improve or hurt your sound, it's more about having a tidy design.
After I got Audio Architect working I never wanted to switch back to London. Try it.
Originally Posted by agronk
This is way for Bss Blu-50 that worked for me!
Is it OK??
HIFI/JBL/DIY-Porn!
(not real porn)
Last edited by bubbleboy76; 06-15-2017 at 12:01 AM. Reason: Detailing which kind of porn I meant,
He's a member here and has posted a link to that vid in this thread
I've been reading all these posts about cloning M2 monitors, but there's still few commentaries about how -the people that built them- end up liking them or how they end up sounding, etc.
Recently I had the oportunity to hear a real M2 set and I really liked them, but I do not see a lot of penetration of this product on the Studio market.(yet). I own a pair of 308 and they sound good, bearing in mind the price, and I noticed JBL released the new series 7, but did not heard them yet.
Does anyone know how to calculate the proper current limit for a 16ohm diaphragm padded with an -3db autoformer all using the the stock M2 network? My Truextent Diaphragms have a power rating of 100w AES and I would like to set a limit of 75w or around there.
Having been intrigued by the D2430K Driver for a while I decided to take it for a test run, made a pair of what I call M2!5 (pun intended with the !) This is one nice sounding Speaker system 25Hz - 20kHz @ 95dB 2.83V / 1M Nominal impedance 4 Ohms (min 3 Ohm max 9 Ohms) Crossover point @ 900Hz 5th order. D2 diaphragms in parallel as is the 2 ea 2235H woofers. The crossover is made with Charge coupled capacitors for the D2430K driver.
Good Listening
Peter
Wow those are sweet! Did you document the build process?
Welcome to Lansing Heritage.
Barry.
If we knew what the hell we were doing, we wouldn't call it research would we.
Stunning build!
How did you fill the logo gap on the horn lip?
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