Item: 3X Scanspeak 10F/4424G00 4" 4ohm full range
Location: Brisbane - can post if required - will use Officeworks Mailman (insured and sign on delivery at reasonable price)
Price: $200 + freight if required
Item Condition: 9/10 - 2 units perfect - 1 unit has small residue of solder
Reason for selling: These speakers were the original units intended for my 3D - printed speaker project. I got half way through that and decided to concentrate on another project (CNC is sooo much faster than printing). Not needed. Got 3 units in all to try to get a pair that were perfectly matched, one is more sensitive than the others (see below).
Payment Method: Pickup - Cash, Paypal (+3% if not "pay as friend), COD Only
Extra Info: These units currently retail at $132 plus freight. They represent the sweet-spot between a small driver that have a smooth on axis and excellent off-axis response combined with good power handling (especially if used with a high-pass crossover). The glass-fibre composite also gives a good degree of stiffness and internal dampening - as evidenced by the low dampening surround.
The graphs below are totally raw so they might look a bit alarming compared to the marketing-department version of speaker response graphs you are used to seeing. Their smooth and extended response allowed me to design a crossover point of 4500Hz - this leaves a lot of options with regards to the tweeter as you can use a smaller / lower powered unit. I used a high-pass at 450Hz to an 8" woofer. I have seen these successfully used in a FAST (full range / subwoofer topology) but I suppose you could use them full range for a very small set of desktop speakers too.
I ended up buying 3 of these. The first 2 had different sensitivities. I could have adjusted the crossover to accommodate this but couldn't help myself and bought another one which was very closely matched so I ended up with 3.
Zaph (just before he got the sh*ts with DIY) did some extensive testing on these tweeters - (see about half way down the linked page) -http://www.zaphaudio.com/blog.html
he used Soundeasy and seems to have smoothed the responses a bit more than me. Conclusion - flat response, low distortion and excellent power handling if crossed over above about 300Hz (i.e. can handle 256 watts RMS if crossed over here).
My own findings - these really are a great driver. The low distortion is apparent and they allow a great deal of design flexibility. Those who listened to them certainly agreed.
Pictures: Stock photos in the links below but you can also see the real units here - http://www.stereo.net.au/forums/index.php/topic/81786-origami-3d-printed-speaker-build/
----------- Note the correlation between the green and pink trace below up to about 5000hz.
This is real data that I measured using DATS:
Driver A-
Fs = 105hz
QTS = 0.461
Vas = 2.058
Sens = 91.85 (2.83Vrms @ 1m) - this one the one that was more sensitive.Adding more resistance will adjust the QTS slightly and trim the level to bring it down to the other units below.
Driver B
Fs = 108hz
QTS = 0.525
Vas = 1.699
Sens = 90.4 (2.83Vrms @ 1m)
Driver C
Fs = 107hz
QTS = 0.523
Vas = 1.701
Sens = 90.35(2.83Vrms @ 1m)
******* I have these at my office and I am on leave at the moment. It might take me a few days to get in there and post the items once payment has been received. Don't worry, I am not really a Scumbag. ![;)]()
http://www.wagneronline.com.au/scan-speak-4-wideband/speaker-drivers-audiophile/audio-speakers-pa/10f-4424g00-27160/959637/pd/
http://www.speakerbits.com/index.php?page=shop.getfile&file_id=98&product_id=3908&option=com_virtuemart