So, when I try ‘better measurements’, outdoors or large room, I plan to do:
- far field: individual drivers (twin for woofers) at 10degree or 15degree step 0 to 90degree (2m or so mic distance).
- near fields: individual drivers (twin for woofers) mic 2cm
Do I want to do anything else? E.g. boosted woofers? Full speaker with a test set of XOs?
- far field: individual drivers (twin for woofers) at 10degree or 15degree step 0 to 90degree (2m or so mic distance).
- near fields: individual drivers (twin for woofers) mic 2cm
Do I want to do anything else? E.g. boosted woofers? Full speaker with a test set of XOs?
For a reliable directivity index you could add 90-180° measurements.
That doesn't look like a lot of power. I would probably high-pass at 30hz, to keep from wasting any.
The first spec sheet is what is driving the woofer section, so 250Wrms.
He's fine.
He's fine.
WinISD sim shows max power 240W (and hitting xmax) at abt 30Hz with LT boost. Based on that and with power limiters applied (and thermal protection) I thought I should be OK. I did think to apply a steep high pass at abt 20Hz to limit excursion below 30Hz. And I also got advice here to do the same.
Archimago has tested the 2-ch amp that is used in FA253 - pretty good. Test runs start from 10Hz
https://archimago.blogspot.com/2020/01/measurements-hypex-ncore-nc252mp.html
The tweeter has mono amp NC100 which should be just as good. Lower gain though
https://archimago.blogspot.com/2020/01/measurements-hypex-ncore-nc252mp.html
The tweeter has mono amp NC100 which should be just as good. Lower gain though
Subjectively, it sounds perfectly transparent. I do not even think about the amps, only about crossover/EQ setup. And I don't think I will reach its power limits even when playing very loud. I am glad I went for the 253 - not 123 or 503. I think the 253 is just right for the project.
I will be having another go at measurements in a large room (local church) end of May, hoping to produce a set with wider gating (compared to my small flat). My confidence level is very low, though.
If someone in London is willing to join and help, that would be greatly appreciated and rewarded with endless supply of food and beer 🤓
If someone in London is willing to join and help, that would be greatly appreciated and rewarded with endless supply of food and beer 🤓
What could be causing these dip and peak on the tweeter? They are even more pronounced on the nearfield measurememts.
The files are here:
https://www.diyaudio.com/community/...ex-fa253-learning-project.421061/post-7988085
The files are here:
https://www.diyaudio.com/community/...ex-fa253-learning-project.421061/post-7988085
Are these worth addressing?
Notch out the peak and apply negative gain low shelf to drop the tweeter response below 12k (instead of dropping the entire tweeter)?
Notch out the peak and apply negative gain low shelf to drop the tweeter response below 12k (instead of dropping the entire tweeter)?
Unless you are a female under the age of 24, or a male under the age of 18, it is unlikely that you hear much above 16k.
I usually try to EQ a tweeter flat to 16k, and with Hypex FA this is easy. If this were a passive speaker, you would just have to live with it, and things like this are what make various tweeters sound different.
I usually try to EQ a tweeter flat to 16k, and with Hypex FA this is easy. If this were a passive speaker, you would just have to live with it, and things like this are what make various tweeters sound different.
