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Old 25th February 2009, 03:04 PM   #1
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Default Css Fr125

I have a pair of the FR125 drivers sitting around, which haven't seen much of the light of day. (As a note, don't think they're the new version) I am thinking of doing something with them. My initial thought is a small sealed box with a smaller woofer or two in a taller box down below. Could also use them OB with a box below. I'd like to try to keep a narrower profile with these. Would like to run the 125 without a crossover, if possible.

I haven't listened to these yet, but assuming they aren't as fast as the lighter cone / surround drivers, but could be wrong.

I'd like to keep these on the smaller side, so I'd prefer not to go with a giant woofer. Use will be varied, tv and movies, as well as music, but nothing too serious. I will most likely just run these with a Harmon Kardon integrated piece I have. Thinking I could to an inexpensive plate amp for the woofers, if that would make sense. I'd prefer they run without a sub.

At this point, these won't be backed up against a wall. Right now, they would be positioned out in the basement. Hardly ideal, but I also don't expect perfection. If the woofers are vented, it seems to make the most sense to have a front port.

With that, any thoughts on a good combo of the FR125 to a woofer? I am thinking I could run 2 below, if that would make sense.

Any thoughts are appreciated. I've been trying to get this posted for some time, but have been over the top busy. I'll be out of town for a couple days after today, but will do what I can to keep an eye out for replies.

Many thanks in advance!
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Old 25th February 2009, 03:59 PM   #2
chrisb is offline chrisb  Canada
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If budget permits, a single CSS SDX7 would be my first suggestion in combination with the FR125, and can be fit in a pretty teeny box. Mounted on the side panel, you can get them in a tower skinny enough that fitting a plate amp would be the biggest challenge.

In which case an outboard bass amp can relieve that constraint:

Click the image to open in full size.

http://www.parts-express.com/pe/psho...number=300-812


For a smaller budget,($30 ea) the Silver Flute 6" from Madisound is another great contender.


In either case, I'd think about a hi-pass filter on the FR125, - even though it has amazing low end FR and excursion for a 4" driver, it definitely has a limit, and you'd likely notice substantially improved mid-bass and lower midrange transparency and articulation, as attaining higher SPLs, by relieving it of heavy lifting in the lowest 2 octaves or so.
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Old 25th February 2009, 04:37 PM   #3
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Quote:
Originally posted by chrisb


In either case, I'd think about a hi-pass filter on the FR125, - even though it has amazing low end FR and excursion for a 4" driver, it definitely has a limit, and you'd likely notice substantially improved mid-bass and lower midrange transparency and articulation, as attaining higher SPLs, by relieving it of heavy lifting in the lowest 2 octaves or so.
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Old 25th February 2009, 04:41 PM   #4
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Start with the 4 1/2 litre aperiodic box (a couple variations in the p10-hifi box library), add a 1st order PLLXO to the driving amplifier.

dave
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Old 25th February 2009, 04:49 PM   #5
chrisb is offline chrisb  Canada
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Quote:
Originally posted by planet10
Start with the 4 1/2 litre aperiodic box (a couple variations in the p10-hifi box library), add a 1st order PLLXO to the driving amplifier.

dave

If the HK integrated amp doesn't have pre - main connections, would the PLLXO work on a tape monitor loop?
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Old 25th February 2009, 05:24 PM   #6
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Quote:
Originally posted by chrisb
If the HK integrated amp doesn't have pre - main connections, would the PLLXO work on a tape monitor loop? [/B]
Yes

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Old 25th February 2009, 05:52 PM   #7
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I did post a response earlier, but it seems to have vanished.

Anyway, thank you for the thoughts. The CSS driver seems to make sense.

Is there an advantage to having the driver on the side vs. the front, aside from the obvious size advantage? I'm asking only because with the strange placement, I wonder if the front would project a bit better. Unsure about this.

If I do a front placement with 1.5" from the box edges to the inside edges of the driver, I can do about a 10.25" width for the speaker. Not too bad. Can go narrower the other way, if that makes more sense.

Dave, I'll look into your box for the top. Do you gents feel it's a good idea to run the woofer sealed? CSS has a sheet that offers some box plans for sealed, one being the woofer in a sealed box below with a smaller satellite on top, similar to what I've been considering. (I tried to attach it previously, must have meant the demise of my post) Could do both boxes sealed.

Thank you for the suggestions.
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Old 25th February 2009, 05:57 PM   #8
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Quote:
Originally posted by planet10
Start with the 4 1/2 litre aperiodic box (a couple variations in the p10-hifi box library), add a 1st order PLLXO to the driving amplifier.

dave
Dave, how would this work? I understand adding a crossover to the driver in the box, but wondering if that's what you have in mind here?

Thanks!
Layne
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Old 25th February 2009, 06:25 PM   #9
chrisb is offline chrisb  Canada
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Quote:
Originally posted by one1speed


Dave, how would this work? I understand adding a crossover to the driver in the box, but wondering if that's what you have in mind here?

Thanks!
Layne

Layne - not the only technical article on the subject, but a good place to start;

http://www.t-linespeakers.org/tech/f...ssiveHLxo.html


think "little black box" with passive components (R/C only in this case) - when dedicated to a specific XO hinge point and slope, these can be very simple, cheap and quite effective. The plastic box (and connectors if you don't hard wire it) could cost more than the components.

operates on the signal a line level - before the final power amp stage

it's even possible to include the filter on the input stage of a power amp (which I've done with great success) - but of course with out a bypass renders the amp ess than full range
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Old 25th February 2009, 06:47 PM   #10
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Thank you. I'll have to look into that article.

Heading out, will check back as I can.

Cheers.
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