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Old 3rd September 2005, 08:46 PM   #31
frugal-phile(tm)
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Location: Victoria, BC, NA, Sol III
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Default Re: Dreaming...

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
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Old 3rd September 2005, 09:11 PM   #32
herm is offline herm  United States
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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
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Old 6th September 2005, 03:33 AM   #33
SCREEM is offline SCREEM  Canada
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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....
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Old 6th September 2005, 01:16 PM   #34
robertG is offline robertG  Canada
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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?
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Old 6th September 2005, 02:39 PM   #35
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Location: Sudbury, Ontario Canada
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.
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Old 7th September 2005, 01:05 AM   #36
SCREEM is offline SCREEM  Canada
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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!
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Old 27th March 2006, 06:12 AM   #37
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How high of an active high-pass filter would you have to implement to avoid the farting altogether even at high 100dB levels?
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Old 27th March 2006, 04:58 PM   #38
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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
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