Usher 3 Way Design Completed

Agee · 26th February 2007, 03:35 PM

This is a new 3 way Usher design that I just completed. It uses the Usher 9950 tweeter, 8945A 7" and 8955 8". The crossover was designed by Joe D'Appolito. The cabinet was made up from MDF ,the front baffle is 2.25" thick and is profiled on the top for reduced diffraction effects. I also made the TM portion of the baffle separate from the Woofer portion to reduce vibrational interference. Each speaker weighs about 110lbs. These speakers have turned out to be very,very nice with great detail and imaging as well as a very clean and fast low end. Bass extension is easily ino the low 30s.

FYI for WAF ,I keep these in the cabinet shown behind doors with grillcloth builtin. When I want to listen by myself critically I just bring them out into the room and position them with the correct placement.

Thanks for looking!

sqlkev · 26th February 2007, 04:14 PM

Nice project,
how did you obtain the crossover design for this speaker?

Agee · 26th February 2007, 04:41 PM

I purchased the drivers from Elliot at Zalytron a while back and he sent me the design that Joe D had provided for him. It included the crossover schematics,desired box volumes and port dimensions,etc. I may play a bit with some tweaks in the future ,but it sounds great right now.

ttan98 · 26th February 2007, 07:44 PM

looks great..

1. any measurements or spec?

thanks

Agee · 26th February 2007, 10:09 PM

I don't have any measurements on it. I stuck to the design from Joe D'Appolito though. I would imagine the measurements are close to the older Usher's using the same drivers with the silk dome tweeter.

Agee · 26th February 2007, 10:09 PM

This is the crossover. I would love to hear any comments from the design experts out there.

sreten · 27th February 2007, 03:14 PM

Quote:

Originally posted by Agee
This is the crossover. I would love to hear any comments from the design experts out there.

Hi,

Designed by J D'A or not I'm not that keen on the design.

It is one of the ways to try to get round baffle step compensation.
In this case lower bass is brought by presumably low mounting the
8" bass unit near the floor - it needs aggressive filtering to prevent
a big dip in the lower midrange due to floor reflection.
Boosting bass this way removes deep bass room gain you can use.

I cannot tell just by inspection whether baffle step higher up is
correctly handled, one would presume it is, but it would need a
fair amount of simming work or measurements to confirm it is.

I've not heard any speakers that fudge BSC that sound really neutral.

Just my considered opinion ........

/sreten.

Agee · 27th February 2007, 05:22 PM

Sreten,
Thanks for your reply. I am not an expert on crossover design but I do know that fortunately I do not hear a lower midrange dip in my room. I would be interested in what frequency range you would expect the dip to cover.

I am not sure that I could handle much more bass reinforcement in my 16x19 room either. The bass extends into the low 30s ,is tight and tuneful but not overdamped.
Is your premise of the lower woofer mounting similar to the design that Audio Physic has used in the past with their side mounted 7" Scanspeak drivers mounted low?

Thanks for your input! I would like to learn more about how different speakers are designed, any comments on my latest project will help me to further my knowledge. A friend of mine has a great deal of experience with 1st order series crossovers and I considered having him take a look at this speaker with that type of crossover in mind. I don't know if these drivers would be applicable to this type of crossover or not. The FS of the tweeter is relatively low but the mid may not be smooth enough for a 1st order crossover without a lot of extra work.

sreten · 27th February 2007, 07:29 PM

Quote:

Originally posted by Agee

.....I would be interested in what frequency range you would expect the dip to cover .........

........Is your premise of the lower woofer mounting similar to the design that Audio Physic has used in the past with their side mounted 7" Scanspeak drivers mounted low?.....

a) somewhat above the 220Hz (?) crossover point.

b) basically no, have seen it in Mordaunt Short Performance speakers.

c) don't try a 1st order series c/o - will not work well.

/sreten.

Agee · 27th February 2007, 07:43 PM

Thanks for the info. I don't have any fancy measuring equipment but do have a Radio Shack sound level meter and test tone discs.
If anyone is interested I can take some measurements this weekend (the RS Meter doesn't measure the highs correctly from what I understand).

26th February 2007, 04:41 PM	#3
Agee diyAudio Member Join Date: Feb 2007 Location: Louisiana	Crossover design I purchased the drivers from Elliot at Zalytron a while back and he sent me the design that Joe D had provided for him. It included the crossover schematics,desired box volumes and port dimensions,etc. I may play a bit with some tweaks in the future ,but it sounds great right now.

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26th February 2007, 04:14 PM	#2
sqlkev diyAudio Member Join Date: Mar 2004 Location: 714	Nice project, how did you obtain the crossover design for this speaker?

26th February 2007, 07:44 PM	#4
ttan98 diyAudio Member Join Date: Apr 2006 Location: Melb	looks great.. 1. any measurements or spec? thanks

26th February 2007, 10:09 PM	#5
Agee diyAudio Member Join Date: Feb 2007 Location: Louisiana	I don't have any measurements on it. I stuck to the design from Joe D'Appolito though. I would imagine the measurements are close to the older Usher's using the same drivers with the silk dome tweeter.

27th February 2007, 05:22 PM	#8
Agee diyAudio Member Join Date: Feb 2007 Location: Louisiana	Sreten, Thanks for your reply. I am not an expert on crossover design but I do know that fortunately I do not hear a lower midrange dip in my room. I would be interested in what frequency range you would expect the dip to cover. I am not sure that I could handle much more bass reinforcement in my 16x19 room either. The bass extends into the low 30s ,is tight and tuneful but not overdamped. Is your premise of the lower woofer mounting similar to the design that Audio Physic has used in the past with their side mounted 7" Scanspeak drivers mounted low? Thanks for your input! I would like to learn more about how different speakers are designed, any comments on my latest project will help me to further my knowledge. A friend of mine has a great deal of experience with 1st order series crossovers and I considered having him take a look at this speaker with that type of crossover in mind. I don't know if these drivers would be applicable to this type of crossover or not. The FS of the tweeter is relatively low but the mid may not be smooth enough for a 1st order crossover without a lot of extra work.

27th February 2007, 07:43 PM	#10
Agee diyAudio Member Join Date: Feb 2007 Location: Louisiana	Thanks for the info. I don't have any fancy measuring equipment but do have a Radio Shack sound level meter and test tone discs. If anyone is interested I can take some measurements this weekend (the RS Meter doesn't measure the highs correctly from what I understand).

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