Pioneer 4" Alnico

nodiak · 15th November 2009, 07:36 PM

Bought off ebay 1-2 years ago as NOS. Haven't done more than play them mildly for an hour free air with 45uF for protection, using 8" woofer with coil under. Pioneers don't sound bad, maybe even good.
Their construction is curious to me because they don't have separate surrounds, just the cone material has a roll then is glued to frame.
Thought someone would know something about this type. Maybe their just for clock radios or something, tho seem better than that.

nodiak · 15th November 2009, 07:44 PM

On back: B5491260P3

If get time this week will build a 5L cab to house them and keep them playing mildly. Can't expect much power handling, so will likely use with woofer below. (Have reconed Philips 15's , Madison Knight 15's, Meniscus 8's, and HA FR8's can try).

planet10 · 15th November 2009, 07:59 PM

Substantial magnet on those... the integrated accordian surround means little bass but no change in material impedance as the waveform hits the surround. Could well make a decent mid-tweeter.

dave

nodiak · 15th November 2009, 08:21 PM

Any idea the type of speaker they would've gone in? Seller said they were from 60's fwiw.

planet10 · 15th November 2009, 09:05 PM

I'd guess they were out of a small box, 3/8 or 1/2" ply, rear mounted, with a masonite back, possibly filled with small holes. 8-9" tall, 6" wide, 5" deep. Usually finished in walnut (real veneer).

dave

InclinedPlane · 15th November 2009, 10:03 PM

Quote:

Originally Posted by planet10

Substantial magnet on those... the integrated accordian surround means little bass but no change in material impedance as the waveform hits the surround. Could well make a decent mid-tweeter.

dave

What would happen if you cut the surround with a razor all the way around but leaving four small sections NSEW, say, no more than 1/2cm wide to hold it? I was just thinking of a cheap way to make a 'surroundless' speaker like Fertin did, but without the nasty-looking wire.

Don't freak out, it would just be experimentation!

nodiak · 16th November 2009, 12:10 AM

Thanks for the input Dave. Should be able to get the 5L cabs together this week. Will allow aperiodic option.

"What would happen if..."
Could be interesting but not for me.

I do have 4 of these and might coat the cones on 2 and maybe even phase plugs. Then compare to untreated over time.
After an afternoon the midrange is very nice. Vocals, speech, guitars especially - "relaxed and natural", like they designed for then it seems. Crash cymbals still unruly, cymbal dome pretty real. Worth playing with.
Don

15th November 2009, 07:59 PM	#3
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	Substantial magnet on those... the integrated accordian surround means little bass but no change in material impedance as the waveform hits the surround. Could well make a decent mid-tweeter. dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

15th November 2009, 09:05 PM	#5
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	I'd guess they were out of a small box, 3/8 or 1/2" ply, rear mounted, with a masonite back, possibly filled with small holes. 8-9" tall, 6" wide, 5" deep. Usually finished in walnut (real veneer). dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Help to choose between Alerion & Pma6 Ob with "Tone Tubby" AlNiCo	HPH	Full Range	1	27th July 2009 08:34 PM
Old alnico 10"	TroelsM	Multi-Way	5	3rd November 2007 02:55 PM
Coral 8A7, 8" Alnico ?	batdorf9	Full Range	1	4th December 2005 02:26 AM
FS 2@ 15" JBL Alnico speakers	kjunom	Swap Meet	5	3rd December 2005 09:39 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

15th November 2009, 08:21 PM	#4
nodiak diyAudio Member Join Date: Nov 2004 Location: really northern cal. coast	Any idea the type of speaker they would've gone in? Seller said they were from 60's fwiw.

16th November 2009, 12:10 AM	#7
nodiak diyAudio Member Join Date: Nov 2004 Location: really northern cal. coast	Thanks for the input Dave. Should be able to get the 5L cabs together this week. Will allow aperiodic option. "What would happen if..." Could be interesting but not for me. I do have 4 of these and might coat the cones on 2 and maybe even phase plugs. Then compare to untreated over time. After an afternoon the midrange is very nice. Vocals, speech, guitars especially - "relaxed and natural", like they designed for then it seems. Crash cymbals still unruly, cymbal dome pretty real. Worth playing with. Don