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Hi Steve,

Using a different woofer will indeed call for a different correction.
If you don't want to have to measure and tune everything yourself then I would advice you to stay in known...

The impedance is rising from 7kHz up, so the series resistor will produce less and less attenuation at higher frequencies.

Hi Rob,

There is a typo: the table shows 87dB/1m at 15kHz for 2.83V, whereas all the graphs show that same 87dB value at 15kHz for 1V.
If the voltage value found in the curves is the right one...

There is a typo indeed: it should read 1V instead if 2.83V, as confirmed in the curve page 8 of the EDS: http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=57200&stc=1&d=1350657541
...

Not quite.

Hi Andy,

If you want more SPL another solution is to use two 2216nd per speaker, in a 2.5-way arrangement similar to the 4435 or DD66000:
...

Looks exactly like what a spammer would do :D
Just kidding, welcome aboard!

Wait, they mention audioheritage at 10:09! :p

There are some good candidates for both balanced and unbalanced operation now!
For unbalanced operation the current champ is the topping L30:...

I wonder if that horn will be available as a part...

Very exciting indeed!

What about the distortion of the amp itself, for power tests?
An autoformer could possibly solve the issue, or simply an lpad.
Another solution would be to use a very quiet...

What make you think the voice coils are damaged?
I don't see anything obvious from the picture above.

At this point you should probably send the drivers to some competent shop and have them clean...

The 476Mg use magnesium diaphragms that are different from the titanium ones listed above.
Unless you manage to get your hands on magnesium diaphragms you will not get the same response as the...

Thanks for posting this!
With such an high crossover frequency for a 12" woofer that was to be expected.

You really need to measure the output of your DSP and adjust from there, as it is both easier and (much) more accurate than measuring the drivers + room.
By the way, do you have an accurate...

Hi Rob

That spinorama might come from an early prototype, but might not have passed the listening test... :dont-know:

The UHF response drops off axis, but that is already pretty good for a 1.5"...

The listening axis is indeed right between the horn and woofer, but you cannot use that for nearfield measurements as you would get a much higher angle that way that what you would get at...

Rob, I can relate to your 3" vs 4" listening impression here: the is a notable difference in dynamic that is hard to understand when looking at measurements.
I also heard the same kind of difference...

Sorry for the confusion!!
I will continue in your large format comp thread: http://www.audioheritage.org/vbulletin/showthread.php?42373-Large-Format-Compression-Driver-Listening-Impressions

Amazing work Rob!
Have you had a chance to compare the 2453 with the 2450SL sonically?

Hi Flodstroem,

Mine was pretty old, probably first generation with the ASRC bug and extension card port.
I remember the processor usage went up and down for no good reason.
Maybe they improved...

Looks like a legit D2430K driver to me.
The "M2" version (whatever that implies) exists with both the grey and yellow foilcals.
What you need to look for here is the "M2 D2430K" paper sticker on...

300Hz is a difficult frequency to deal with when measuring in a room, but with a combination of close mic measurement and spatial averaging around the listening position (eg MMM technique) it can be...

Hello Herman,

The TD4003 has two important traits that need to be considered when choosing a horn:

Its output diameter is 39mm, ie a bit larger than the 38mm of the JBL (and other brands) 1.5"...

Hey Barry, I'll take the opportunity to ask you something, as I trust your option/taste on those things.
I know you love both the 2020H and 2123H, but what about the 2012H then?