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Nice Flodstroem!

They sure do look nice in veneer. We did our black but when seeing your we should have done them that way. Excellent.

Stay safe
//Rob

Hi,

I agree, it is a bit odd that these new drivers also seem to be "reverse polarity". Attached is the pulse response with reversed polarity, ie positive puls into negative connector. Lower is...

Hi sguttag,

Good that you can confirm that. Puls patter from the D2 driver is definitely reverse, ie positive voltage on the minus pole creates pressure at the driver exit.

In M2 there is a 6db...

With the help of a fellow JBL nerd, we have come to conclusion that the M2 DSP parameters kindly posted earlier in this thread are not correct for BSS DSP units.

They are probably taken from a...

Hi sguttag,

Please check on you factory filter to see if the input positive leand goed to the negative terminal on the driver. I would expect so.

I checked the exploded view on the VTX F127F15...

Maybe this is already covered in this very long thread but I thought I would mention it anyway.

The D2 (2430K) should be wired with reversed polarity, with the positive lead going to the negative...

Me too....
85492

Hi POS,

Email sent with all data. Share as you see fit.

Kind regards
//Rob

Hi,

Sorry, meant the older 2447 & 2450SL & 2451.

Post corrected

Kind regards
//Rob

Hi Mitcho,

That was encouraging. I have never really found a way to “cure” the dip on the243X drivers. I will try to make an adapter next week and try. I have a pair of 2453 in the shop.

The...

Hi,

Yes, the 2453 is nowhere near as deep as the 2451/2450SL so the phase plug would have to be simplified.

I have not been able to get the smooth 2447/2451/2450SL/476 curve with 2452, 2453 or...

Dear all,

POS, totally agree, I did not use the stock network and hence the impedance would be different in the original M2 system.

-And the 2451 cores are way easier to mount. The D2’s and the...

Hi POS,

Please bear in mind that the SL's were new but I don't know the history of the D2's.

Measurement was done with 68cm flight distance, a bit on the short side but my room is too small....

Please see attached impedance sweep with DATS from 500Hz to 20kHz for both 2450SL and D2 mounted in the M2 waveguide. D2 is very flat 20ohm and 2451SL goes from 10 ohms to about 20 ohms at 20kHz.
...

Hi Pos,

The 2451SL's are 16 ohms and the dia's are brand new.

The D2's are 20 ohm impedance, please see post with curves above. There is a peak at 1,8kHz and one at just below 900Hz, measured...

D2 vs 2451SL on M2. 5ms window, no smoothing. Electronic XO @ 400Hz 18db LR. LspCAD 6.0 PRO. Earthworks calibrated mic. 68cm out = FF. Dual channel measurement.

Ripple is mostly room albeit pretty...

Here are the D2 imp sweeps. Both look reasonable the same.

You decide.

Kind regards
//Rob

80171

I can put two D2˚s on the impedance rig on Friday and post the curves.

Kind regards
//Rob

Great thread. Nice looking speakers, i’m sure you will like them.

Just as a note, I think all D2 drivers are 20 ohms when the voice coils are connected in series. At least the ones I have had. It...

I agree. They look fantastic.

Can I order a pair?

Kind regards

//Rob

Here are the one I have left. Small are 30x30mm and larger 30x40mm. I have only 3 pairs of the larger ones. About 3mm thick. PM with needs :-) .

I will try to get more of the black/White 30x30mm...

PM sent.

Look what the mailman brought.

Have a nice weekend

//RoB
75382

Dear all

Logos as per the picture are 5 Euros each plus cost of letter shipping to where ever you are.

And yes, they fit perfect in the M2 WG as they are 30mm x 30mm. :-) . About 3mm thick
...

All adaters spoken for. If there is interest I can order an 4th batch.

Logos still available.

Merry Christmas.

//Rob