Sammi - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

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
Reply
 
Thread Tools Search this Thread
Old 12th November 2007, 10:14 PM   #1
diyAudio Member
 
Join Date: Nov 2007
Default Sammi

Hi.

NEw here to this forum. I have been studying single-driver speakers for a while and several designs have captured my attention like the Frugal Horn, Zigmahornet and the Harvey.

I ran across some interesting 4" and 8" drivers, where else, but on Ebay. I am expreienced enough to know I can't just randomly drop them in a cabinet, but I am inexperienced enough to knw how to calculate how big a cabinet I need to make to make a voight pipe, MLTL or TQWT work.

Here are the specs for the 8" driver:


Sammi Sound Technology Corp ME-0850 (B4F5).
8 ohm
50 Watts RMS (100 Watts program power)
25 ounce magnet (1.5 pounds) 2" voice coil.
Steel frame with butyl rubber surround. Standard mounting holes.

Thiele & Small parameters:
Fs=67.81,
Re=5.1085 ohms,
Qes=0.3581,
Qms = 7.4214,
Qts = 0.3416,
Le = 0.3960mH.


Thanks, I look forward to one day contributing meaningfully to this.
  Reply With Quote
Old 13th November 2007, 12:39 AM   #2
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
thats a treated cloth surround on the 8"- I made that quick parameter measurement but have not measured one since running it hard. Sammi 8 should work with a "helper" tweeter in small bass relex or a MLTL of modest size - I mounted one in a fake Zu Druid (~1.3 cubic foot pipe) and it played pretty well with a baffle step filter.

ask the guys here who have MJK's sheets handy go cook up a couple of MLTL for you -- you might buy one unit and see how you like it.. IIRC, it simed ok in the stock 206E MLT example which starts MJK's sheet and that was almost twice the volume of a Zu Druid - bigger means more lows but also more excursion in the upper bass area

It sims ok in Cyburgs Viech back loaded horn and here's how it plays vs my Heresy in-room with the Sammi 8 In a BK20 (~same as old Fostex BK201 horn) -- the Heresy is elevated. That little Sammi if nothing else is pretty loud and I've pushed it very loud in a Karlson klam - -its a little boxy but good for low $ and tougher than B20 -- -B20 might be prettier sounding

Heresy elevated 16" vs Bk20 w. Sammi 8 helped by ST324 slot-load tweeter and 1.1uF highpass
http://img216.imageshack.us/img216/5...resyir1it3.gif
Heresy and BK20

video of Sammi 8 in a Karlson 8 (not klam) knockoff - -keep your pc sound down as the level is high and distorted - theres high and low pressure areas - partly due to vent arrangement

http://img531.imageshack.us/my.php?i...ssurek8lc4.flv

video of Sammi 8 in a klam-projector - I didnt' have enough gain to push it hard - with more juice it was pretty good 150 feet away
http://www.youtube.com/watch?v=znfE7hjQ40o
  Reply With Quote
Old 13th November 2007, 09:56 AM   #3
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
my internet connection wasn't working well -last night - heres the on-axis of the Sammi by itself inroom - these woudl probably look better outdoors and awy form reflectopms

Sammi
http://img154.imageshack.us/img154/9637/s8w1tl5.jpg

B20 vs Eminence B102
http://img148.imageshack.us/img148/9...02vsb20zy6.jpg
  Reply With Quote
Old 13th November 2007, 10:25 PM   #4
diyAudio Member
 
Join Date: Nov 2007
Default So for 15 bucks the driver is a good place to experiment ?

I pulled down the spreadsheet off of the http://melhuish.org/audio/software.html website, so I can plug and chug that to make either a plain Voigt Pipe or a bent one like the one shown in the spreadsheet. Thanks for the tip there.

As far as sound goes, it likely will not beat a Lowther, but at 1/10 the price, I largely don't care. I am thinking for HT or for using it with a 3.5W 6A5 SET amp as nighttime jazz to sleep to in my beadroom (15x20).

Do you think it needs a tweeter? They have cone tweets for $4. Not that price is the object, I could buy a Fostex driver and tweet as well. I just like the idea of using unconventional (and admittedly inexpensive) parts.

Thanks
  Reply With Quote
Old 13th November 2007, 10:35 PM   #5
diyAudio Member
 
Join Date: Sep 2006
Could you post a link to the drivers? I am interested as well, if they are cheap enough and efficient for a Push-push boombox
  Reply With Quote
Old 13th November 2007, 11:35 PM   #6
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
re- tweeter - its needed if you're using a blh - might do without if its in direct-radiator - I had a 2mH/8R baffle step filter which made it ok for a cheap speaker - it can take more power than B20 (perhaps due to stiff suspension ?) which is pretty wimpy

double-wide Viech might be fun noisemakers :^)

link

http://cgi.ebay.com/High-Quality-Raw...QQcmdZViewItem
  Reply With Quote
Old 14th November 2007, 05:36 PM   #7
diyAudio Member
 
Join Date: Sep 2006
FS is also a lot higher than the B20, not to mention the QTS is too low for an OB...
  Reply With Quote
Old 15th November 2007, 12:01 PM   #8
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
but its usable for reflex/mltl, pipehorn - maybe ob - I'm not near a simulator - for use withiout tweeter I might pick B20. Sammi's stiff suspension has merit on playing sharp transients which would bottom out the other driver faster -its up to $13.60 each now from original price of $11.60

here's a Druid size pipe prediction without consideration of baffle step - the 2nd Z peak would be higher than the first if thats a concern but that's not an atypical condition
Click the image to open in full size.
  Reply With Quote
Old 15th November 2007, 01:56 PM   #9
diyAudio Member
 
Join Date: Nov 2007
Default I will be using them single in a Voight Pipe

Either a straight pipe or one of the cranked/folded versions will work. Mostly looking for something really efficient to drive with my SET. So I will look at making something a sheet of baltic birch high, 7-degree angle, and wide enough to clear the driver on the baffle. If the top end extension is not enough, maybe I'll cross over a tweeter with a good cap to make up what I am missing. I'll post pics when I get going.

Same guys are selling 4" drivers from the US. Anyone used them?

Thanks!

Robert,
Mannheim
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: 2 Sammi Sound 12" Coaxial Drivers (CX-12AW200G) roger_lew Swap Meet 1 23rd April 2008 01:24 AM
HELP! Need a PE 299-752 3" Sammi Buyout Lance Multi-Way 7 17th May 2006 10:26 AM


New To Site? Need Help?

All times are GMT. The time now is 04:06 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2