GRS 8FR-8: Pioneer B20 for $12?

BHTX

Member
2006-02-16 10:49 am
GRS 8FR-8 Full-Range 8" Speaker Pioneer Type B20FU20-51FW | Parts-Express.com

..However, I couldn't help noticing some apparent differences between this driver and the B20. Obviously, the listed parameters are a bit different, showing the GRS as slightly more efficient. But the cone looks different, too. Notice how the ribs begin farther from the foam surround on the GRS. The texture of the cone, whizzer, and profile of the whizzer might even be slightly different for all I know. The photo shows a sticker with the Pioneer B20 model number though. I'm not exactly certain. Was hoping maybe those very familiar with B20's could chime in and tell me what they think, as I've never held one in person. Either way, they're only $12.50 each, so I might just snag a pair anyway.

Pioneer B20FU20-51FW 8" Full Range Driver | Parts-Express.com
 

BHTX

Member
2006-02-16 10:49 am
No problem. Always glad to share a good deal when I come across it.
Yeah, apologies.. I forgot to mention them not being in stock again until 12/30.
I didn't notice that the other day when I first came across them, must have ran out of stock very recently.
Oh well, I'm in no hurry. They'd probably just sit and collect dust like everything else here. As long as the price doesn't go up and stock returns.
 
Check out this thread... scroll down to see the pics.

http://www.diyaudio.com/forums/full-range/176653-bookshelf-pioneer-b20-tweeter-2.html

I want to build something like badman's really cool B20 project. I have B20's that are in another box but these cheaper 'copies' might prove fun too! Regardless, the B20 is cheap enough and performs well enough to satisfy audiophiles like me. Next week i will sim this GRS driver and compare it to the B20... let's see if they are truly a replacement as they claim. I am hopeful they might sound a bit brighter and want to try them with one of those little push in dayton dome tweeters just for kicks. Would be nice if PE posted a FR chart. The proof will be in the listening but we all have to wait until 2011!

Funny how this driver at $12.50 has got me more excited than those new $99 dayton fullrangers. I can see them in slanted voigt pipes like inexpensive lowthers playing jazz on the cheap partnered with a T-amp or little cubes like badman's filling a room with music.
 
I've been thinking of the GRS lately bc it's cheap (and i have no money at the moment). Just watched 2010 (the movie) and wonder if a 'monolith' type enclosure would work with these... GM's box is nearly monolith like... I doubt modifying the dims will spoil the fun. Maybe a BIB?

Also, maybe this is a tweakable driver. Damar, remove dustcap... I've yet to play with it but recall it had a congested sound that might be improved. Anyone mod the GRS with good results?

Zilla
 
I have a beautiful pair of walnut Bruce horns in need of new drivers. I have them lieing horizontally on the floor stacked with a counter top on top of them (it looks way better than it sounds) with my equipment, record crates and projection screen (white painted particle board) on top of them. I am thinking about putting a few of these drivers in them for center chanel duty, and am curious about midrange quality. I wouldn't be adverse to some mods as the most important thing in a center AFAIC is mids. I might add a tweeter as well.
 
Finally got around to looking at this driver and with the measured specs available leaves too much to be desired for other than some form of ~ aperiodic, MLTL or simple pipe horn loading to keep the cab loading from 'coloring' the mids too much. With such a gap between the two different measured specs and published, one can only wonder what would be delivered. Shame on PE, there's no excuse for such misleading advertising.

Since the B20's measured specs dictate pretty large cabs though, I imagine these drivers will work OK in them once damped.

GM
 
I wonder how it would sound in a pair of Bruce Horns stacked horizonal doing center channel/equipment rack duty.

Finally got around to looking at this driver and with the measured specs available leaves too much to be desired for other than some form of ~ aperiodic, MLTL or simple pipe horn loading to keep the cab loading from 'coloring' the mids too much. With such a gap between the two different measured specs and published, one can only wonder what would be delivered. Shame on PE, there's no excuse for such misleading advertising.

Since the B20's measured specs dictate pretty large cabs though, I imagine these drivers will work OK in them once damped. Don’t know what a Bruce Horn is.

GM
 
"You might need a woofer too... "

We're talking about a pair of 8" drivers that should have great response down to 40hz in these enclosures. In a properly tuned horn full range drivers deliver amazing bass. I will wager a years wages that the biggest problem I will have with these driver in these enclosures is a bit too much low bass.