FR125S in TL? - Page 4

planet10 · 3rd September 2005, 07:46 PM

Quote:

Originally posted by robertG
I dream of a driver with the bass extension of a 125 with the mids and highs of a Fostex FE108ES...

reading my mind?

And the greater efficiency of the FE108ES. I expect that to come at the price of lower Q (ie horn time) and a 2x price tag.

dave

herm · 3rd September 2005, 08:11 PM

******* WARNING: ABOSLUTE HACK ATTEMPTING TO EVALUATE SPEAKER DESIGN ***************

I built GM's MLTL per the design on a previous post.
(thanks Greg)

>45 Hz ML-TL, driver at ~ear height (~+/- 2 dB):
>
>L = 39.56"
>CSA = 43.68"^2
>driver down ~3.3"
>vent = 3" dia. x 3" near/at the bottom
>stuffing density = ~0.3 lbs/ft^3 from top down ~30"
>
>All dims inside and use stuffing in the bottom portion
>of the ML-TLs to 'tighen up' the bass to get a better
>blend in-room if desired.

I stuffed top 30" of each cabinet with about 4 ounces
of polyfil (I bought a 12 ounce bag, and used about one
third of it in each cab).

With my DCX2496 I have implemented a little baffle step
at about 500 hertz (+3db shelving lowpasss), and a low
cut 48DB L-R at 25 hertz.

Speakers were already broken in - 7 liter vented per
Planet 10's site (Thanks Dave).

I have been listening to a broad range of music on
shoutcast and CD, and am very pleased with what
I hear.

I just cannot believe how much bass I am getting out of
these little guys. I am NOT saying that they are going
to replace my 2 JBL SUB1500s. However, I AM sure that
unless I am watching Jurrasic Park I will have no need
to un-mute the Subs.

I am currently listening to "Appalachia Waltz" with cellist
Yo-Yo Ma, double bassist Edgar Meyer and violinist Mark
O'Connor. The capability of these speakers to reproduce
every nuance of these three viols is just outstanding.

No bottoming out yet - Maybe I'll push them hard this
wekend and see if I can get them to misbehave.
Maybe they just dont like Canadians??????

-herm

SCREEM · 6th September 2005, 02:33 AM

I'm getting some bottoming out with the FR125S in the recomended 7L rear ported box, but only at high spl. Its actually too loud for normal listning. On some heavy bass tracks they play fine, on others like Erica Badu they will bottom out but only with like 100W fed to them.

I originaly stuffed the cabs full of dampening, this provided very nice mids and laid back bass. Now I have minimal dampening and the bass is more forward. Dampening seems to have little effect on bottoming out....

robertG · 6th September 2005, 12:16 PM

From what I understand, you get bass bottoming out at very high levels (100w. peak input), but no bottoming out at normal - high levels.

This is good news for a 4 in. 30 watts driver.

Stuffing has no influence on cone excursion at high playback level. Did you try a larger cabinet?

audiobomber · 6th September 2005, 01:39 PM

Quote:

Originally posted by SCREEM
I'm getting some bottoming out with the FR125S in the recomended 7L rear ported box, but only at high spl. Its actually too loud for normal listning.

I had a problem with bottoming on Modern Cool and on a Beck CD, in a 7L cabinet with stuffed port (stuffed with a pair of MacGregor Happy Foot socks). I measured 90 dB with a Radio Shack digital meter (at my listening chair) on the FAST setting. I was using a good quality 50W SS amp.

I agree with your comment about too loud for normal listening, but I would qualify it to say "with these speakers". A single FR125S in a 7L cabinet starts sounding a bit stressed above 80 dB IME and is uncomfortable above 90 dB. Wonderful when operated below its limits though.

Volume is not a problem in my secondary system, but it would be a problem if it was my only system.

SCREEM · 7th September 2005, 12:05 AM

I have not tried a larger cab... I am using some vintage Quad 50E mono blocks wich are conservatively rated 50 watts each. I have to crank them way up to get some poping. If I back off the power just a tad to eliminate the poping, they sound a a little strained, but I would estimated I'm getting 100db at this point, in a nearfield listening situation.

The FR125S is not efficient in the 7 litre cab, But they have an exellent sound for listening at comfertable levels 70-80db.

I love them!

audioaficionado · 27th March 2006, 05:12 AM

How high of an active high-pass filter would you have to implement to avoid the farting altogether even at high 100dB levels?

Cal Weldon · 27th March 2006, 03:58 PM

First listening impressions were good and no bottoming out. They seem capable of filling the garage with plenty of sound and no straining. Here's some pics

http://www.diyaudio.com/forums/showt...046#post879046

Around 22 or 24 litres

27th March 2006, 05:12 AM	#37
audioaficionado diyAudio Member Join Date: Apr 2002 Location: Medford, Oregon, USA	How high of an active high-pass filter would you have to implement to avoid the farting altogether even at high 100dB levels? __________________ audioaficionado

27th March 2006, 03:58 PM	#38
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	First listening impressions were good and no bottoming out. They seem capable of filling the garage with plenty of sound and no straining. Here's some pics http://www.diyaudio.com/forums/showt...046#post879046 Around 22 or 24 litres __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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
Fr125s Bib	cangaceiro99	Full Range	16	26th August 2008 06:16 AM
My take on FR125S in OB	Rafal	Full Range	37	22nd March 2008 10:20 PM
FR125S x2 (EU,UK)	jimbo1968	Swap Meet	0	23rd November 2006 05:21 PM
CSS FR125S 2 way OB	Rafal	Full Range	19	10th October 2006 03:56 PM
css fr125s	joe perry	Full Range	5	10th May 2006 04:11 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

3rd September 2005, 08:11 PM	#32
herm diyAudio Member Join Date: Mar 2002 Location: Pasadena, CA USA	***** WARNING: ABOSLUTE HACK ATTEMPTING TO EVALUATE SPEAKER DESIGN ************* I built GM's MLTL per the design on a previous post. (thanks Greg) >45 Hz ML-TL, driver at ~ear height (~+/- 2 dB): > >L = 39.56" >CSA = 43.68"^2 >driver down ~3.3" >vent = 3" dia. x 3" near/at the bottom >stuffing density = ~0.3 lbs/ft^3 from top down ~30" > >All dims inside and use stuffing in the bottom portion >of the ML-TLs to 'tighen up' the bass to get a better >blend in-room if desired. I stuffed top 30" of each cabinet with about 4 ounces of polyfil (I bought a 12 ounce bag, and used about one third of it in each cab). With my DCX2496 I have implemented a little baffle step at about 500 hertz (+3db shelving lowpasss), and a low cut 48DB L-R at 25 hertz. Speakers were already broken in - 7 liter vented per Planet 10's site (Thanks Dave). I have been listening to a broad range of music on shoutcast and CD, and am very pleased with what I hear. I just cannot believe how much bass I am getting out of these little guys. I am NOT saying that they are going to replace my 2 JBL SUB1500s. However, I AM sure that unless I am watching Jurrasic Park I will have no need to un-mute the Subs. I am currently listening to "Appalachia Waltz" with cellist Yo-Yo Ma, double bassist Edgar Meyer and violinist Mark O'Connor. The capability of these speakers to reproduce every nuance of these three viols is just outstanding. No bottoming out yet - Maybe I'll push them hard this wekend and see if I can get them to misbehave. Maybe they just dont like Canadians?????? -herm

6th September 2005, 02:33 AM	#33
SCREEM diyAudio Member Join Date: Jul 2005 Location: montreal	I'm getting some bottoming out with the FR125S in the recomended 7L rear ported box, but only at high spl. Its actually too loud for normal listning. On some heavy bass tracks they play fine, on others like Erica Badu they will bottom out but only with like 100W fed to them. I originaly stuffed the cabs full of dampening, this provided very nice mids and laid back bass. Now I have minimal dampening and the bass is more forward. Dampening seems to have little effect on bottoming out....

6th September 2005, 12:16 PM	#34
robertG diyAudio Member Join Date: May 2005 Location: Montreal	From what I understand, you get bass bottoming out at very high levels (100w. peak input), but no bottoming out at normal - high levels. This is good news for a 4 in. 30 watts driver. Stuffing has no influence on cone excursion at high playback level. Did you try a larger cabinet?

7th September 2005, 12:05 AM	#36
SCREEM diyAudio Member Join Date: Jul 2005 Location: montreal	I have not tried a larger cab... I am using some vintage Quad 50E mono blocks wich are conservatively rated 50 watts each. I have to crank them way up to get some poping. If I back off the power just a tad to eliminate the poping, they sound a a little strained, but I would estimated I'm getting 100db at this point, in a nearfield listening situation. The FR125S is not efficient in the 7 litre cab, But they have an exellent sound for listening at comfertable levels 70-80db. I love them!