Question on Dynaudio 17W75LQ Esotec

[speedemon]

I have a friend that has a pair of these that he will be using in a two way monitor system. He also heard that the 17W75LQ are not recommended to be driven wide open in a sealed box as to the 17W75 which they can be. They said the LQ’s are not recommended to be run under 70 Hz or with a capacitor to limit them. He heard that the LQ’s should be capped on the bottom frequencies or they will be bottoming out. Does anyone know the real load down on this situation that can share your knowledge?

[eradoncic]

Some of mentioned things are apparently true.
I have Dynaudio 1.3mk2, and they use the LQ driver, since it bottoms out very, very frequently. The same story is true for the smaller Audience 52SE, as described on some reviews, since they use the drivers after ceasing the production of 1.3's (ref.
http://www.audioholics.com/productre...udio52sep2.php
and
http://forums.audioholics.com/forums...+audience+52se)

Both speakers are bass reflex loaded and suffer from the same problem, although for the 1.3s I really don't know if there's problems only with some particular series, or the whole production have sam issue.
The review mentioned above is the only one I can find describing the bottoming out.
I'm also very interested about resolving/clarifying this question.

[speedemon]

To clarify this he was told that the 17W75LQ can not be used as a full range woofer, now does anyone know anything on this?

Thanks

[speedemon]

Does anyone else have any knowledge of this or have any comment or advice to this situation on these woofers?

Thanks

[infinia]

Originally posted by speedemon
I have a friend that has a pair of these that he will be using in a two way monitor system. He also heard that the 17W75LQ are not recommended to be driven wide open in a sealed box as to the 17W75 which they can be. They said the LQ’s are not recommended to be run under 70 Hz or with a capacitor to limit them. He heard that the LQ’s should be capped on the bottom frequencies or they will be bottoming out. Does anyone know the real load down on this situation that can share your knowledge?

These are small woofers when used in small ported cabs are most probably fine for very small rooms and/or a nearfield monitor. Can bottom out in ported much easier than sealed when driven hard or designed into stand mounted farfield designs. When sealed guessing LF response is around 70Hz or so. The question of bottoming out is relative to drive level and the enclosure/crossover design, not according to just the driver. So in summary it depends on what you do with em. If I had them I'd use them as low mids in a 3 or 4 way. Or maybe just a mixing desk 2 way with a Sub helper.



edit>how is your 3 way woofer inductor design going?

[speedemon]

Originally posted by infinia
edit>how is your 3 way woofer inductor design going?

infinia

Thanks for your input. I have put my project on hold for now and seeing how my friend is going to set his up. Since he picked up these drivers on the used market I like to see how the outcome is on them first. I figured that if he can get his setup right then I would use that same setup and incorporated my 30W100’s as the low frequency subs. Basically running a two way system and using four 17W75LQ & the Esotery as the two way the four 30W100’s as the subs in the same enclosure since the binding post are the 17W75LQ & Esotar is together and the 30W100’s are separate. That was one idea that was brought by someone which I thought that might work.

[infinia]

Hi
Sounds like your friend is onto something if he's bi-amping as well. Keep us informed
regards,

[speedemon]

Infinia

No he's not bi-amping, he's just setting the 17W75LQ & the Esotar with the crosssover using these two drivers going as a two way system full range and running a single amp.

For me, I have no option either but to setup my crossover correctly too as I can not afford two Krell's as one is already enough since they suck up so much power.

[infinia]

Hi
Use the Krell for the bottom and for top amp you need roughly about 6 dB less power. So if the Krell is 200W/4 ohms (2 woofers in // ) then look for a good 60-80W/4 ohm amp for the MTM.
Once you Bi-amp you'll never look back, it really makes a difference.

[speedemon]

Infina

I got the system dialed in now after playing with it the last few weeks. Like I said I was going to run the 17W75LQ down to full range. I'm not rolling them off on the low end at all. As I said these are woofers and I really don't I'm going to have a problem of bottoming out as I think the people that are bottoming them out is only using them as their only low frequency source. As I said I'm running two of the 17W75LQ's with also two 30W100's and the 17W75LQ is not my only source for my low end. So I can see why other people had trouble because they were probably over driving them. Pictured below is speaker and my system and if you would like to know more of what I'm running check out my introduction link:

http://www.diyaudio.com/forums/showt...postid=1135712