t-amp with fostex 127e bipole or FR125 bipole?

alexg · 22nd August 2006, 03:59 PM

I have two modified SI t-amp which somebody placed into one case for me, with separate power supplies. It will be connected to a tube preamp.

I am planning on building a bipole full range speaker (bi-amped using the two SI t-amps) and I cannot seem to decide between these two bipoles:

1. Bipole Fostex FE127E on a sealed enclosure as designed by Gio. Bass seems to be lacking, so it might need subwoofer to cover the low-end.

OR

2. Bipole FR125 on a sealed enclosure as designed by Dave. This should have better bass than the Fostex.

My concerns: The Fostex should have better midrange and high clarity while the FR125 would have better bass.

Your thoughts?

edjosh23 · 22nd August 2006, 04:12 PM

I have both driver and enjoy both, but prefer the fostex. The added efficiency makes a big difference to me. I find that the fostex has more detail, but if placed in the proper enclosure can have the low end it often lacks. You are considering only sealed enclosures... any reason? A pair of Fonkens or any of the full range reference project enclosures would be very nice or bipolar minionken or a bipolar mltl. All would have much more bass, if that is what you are woried about.

Josh

preiter · 22nd August 2006, 04:57 PM

Bi-amping two identical drivers (presumably with no crossover) doesn't confer the same benefits as bi-amping a traditional 2-way.

Doesn't seem like it would sound any better than just using a slightly larger amp. And you will get more power out of a T-Amp simply by wiring the two drivers in parallel for a 4 ohm load.

BWRX · 22nd August 2006, 05:21 PM

If he uses one amp per channel he will get better stereo separation. Using one driver per channel of the amp is also a good way to get the most out of a low power amp like the SI as they're more efficient and sound better (my opinion) into an 8ohm load.

You could easily change between wiring the drivers in parallel and using only one channel or using one driver per channel and see which way you like better.

alexg · 23rd August 2006, 02:05 AM

Quote:

Originally posted by edjosh23
A pair of Fonkens or any of the full range reference project enclosures would be very nice or bipolar minionken or a bipolar mltl. All would have much more bass, if that is what you are woried about. Josh

I was after a better midrange that is why I am using a sealed enclosure (which is not the most efficient design).

I need to know which of the two drivers (Fostex 127e and CSS FRS125) would give me a better bass on a sealed enclosure.

Quote:

Originally posted by preiter
Bi-amping two identical drivers (presumably with no crossover) doesn't confer the same benefits as bi-amping a traditional 2-way.

Doesn't seem like it would sound any better than just using a slightly larger amp. And you will get more power out of a T-Amp simply by wiring the two drivers in parallel for a 4 ohm load.

I will be bi-amping two identical drivers on a bipole, which I THINK will make a lot difference, versus bi-amping two identical drivers on the same plane.

I would not want to drive a 4 ohm load using a t-amp, I have read that it overheats the tripath chip.

Quote:

Originally posted by BWRX
If he uses one amp per channel he will get better stereo separation. Using one driver per channel of the amp is also a good way to get the most out of a low power amp like the SI as they're more efficient and sound better (my opinion) into an 8ohm load.

You could easily change between wiring the drivers in parallel and using only one channel or using one driver per channel and see which way you like better.

This is how my two t-amps are wired.

Thanks.

gmilitano · 23rd August 2006, 03:25 AM

Quote:

Originally posted by alexg

I need to know which of the two drivers (Fostex 127e and CSS FRS125) would give me a better bass on a sealed enclosure.

The FR125S will give you better bass, sealed or not.

The FE127E sealed bipole will need a sub @ ~80Hz

Take a look at Dave's page:

http://www.planet10-hifi.com/sealed.html

F3~85Hz F10~46Hz

I would guess that needs a sub @ ~60Hz. Perhaps Dave can comment more.

alexg · 23rd August 2006, 07:49 AM

Since I am really planning to use a subwoofer, I will definitely go with the Fostex FE127E, a friend here in the Philippines, also recommended for me to go with the Fostex.

Anyway, since I cannot audition both drivers and designs, I will consider building the CSS FR125S with a sealed bipole for my next project.

Thanks everybody.

22nd August 2006, 03:59 PM	#1
alexg diyAudio Member Join Date: Jan 2005 Location: Philippines	t-amp with fostex 127e bipole or FR125 bipole? I have two modified SI t-amp which somebody placed into one case for me, with separate power supplies. It will be connected to a tube preamp. I am planning on building a bipole full range speaker (bi-amped using the two SI t-amps) and I cannot seem to decide between these two bipoles: 1. Bipole Fostex FE127E on a sealed enclosure as designed by Gio. Bass seems to be lacking, so it might need subwoofer to cover the low-end. OR 2. Bipole FR125 on a sealed enclosure as designed by Dave. This should have better bass than the Fostex. My concerns: The Fostex should have better midrange and high clarity while the FR125 would have better bass. Your thoughts?

22nd August 2006, 05:21 PM	#4
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	If he uses one amp per channel he will get better stereo separation. Using one driver per channel of the amp is also a good way to get the most out of a low power amp like the SI as they're more efficient and sound better (my opinion) into an 8ohm load. You could easily change between wiring the drivers in parallel and using only one channel or using one driver per channel and see which way you like better. __________________ Brian

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22nd August 2006, 04:12 PM	#2
edjosh23 diyAudio Member Join Date: Oct 2004 Location: Raleigh/Atlanta	I have both driver and enjoy both, but prefer the fostex. The added efficiency makes a big difference to me. I find that the fostex has more detail, but if placed in the proper enclosure can have the low end it often lacks. You are considering only sealed enclosures... any reason? A pair of Fonkens or any of the full range reference project enclosures would be very nice or bipolar minionken or a bipolar mltl. All would have much more bass, if that is what you are woried about. Josh

22nd August 2006, 04:57 PM	#3
preiter diyAudio Member Join Date: May 2006	Bi-amping two identical drivers (presumably with no crossover) doesn't confer the same benefits as bi-amping a traditional 2-way. Doesn't seem like it would sound any better than just using a slightly larger amp. And you will get more power out of a T-Amp simply by wiring the two drivers in parallel for a 4 ohm load.

23rd August 2006, 07:49 AM	#7
alexg diyAudio Member Join Date: Jan 2005 Location: Philippines	Since I am really planning to use a subwoofer, I will definitely go with the Fostex FE127E, a friend here in the Philippines, also recommended for me to go with the Fostex. Anyway, since I cannot audition both drivers and designs, I will consider building the CSS FR125S with a sealed bipole for my next project. Thanks everybody.

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