Seas T35, Seas W8, SB 42fhc75-6 3 way XO

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Dear DiYA members, I have been fomenting this speaker project for the last month and submit the premilinary XO for anyone enjoyment and constructive/destructive comments. Thank you.
 

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It is a return in the past, I had a full alnico setup 3 way with 2n order XO, now going 3rd order. The W8 is as good or better than alnico drivers of the past. I would hope the SB42 can sound good too with the other alnico drivers, finding a 15 inches new alnico would send me to guitar driver realm and I want to avoid it.

Volumes:

Bass 330L vented tuned to 31hz
Mid 13L closed box
 
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It is a return in the past, I had a full alnico setup 3 way with 2n order XO, now going 3rd order. The W8 is as good or better than alnico drivers of the past. I would hope the SB42 can sound good too with the other alnico drivers, finding a 15 inches new alnico would send me to guitar driver realm and I want to avoid it.

Volumes:

Bass 330L vented tuned to 31hz
Mid 13L closed box
Yeah that driver likes a big box. I'm gonna go a little smaller with mine closer to 200- 250L.
 
Really building with same woofer? This is super!

To clarify, I would obtain the SB woofer, not subwoofer, XO at 190hz, tweeter at 1800hz.
What I like about the SB woofer is the reasonable value of inductor, keeping the XO cost part reasonable.

My first idea was to go active with 2 amps, passive with tweeter/mid, however it is not cheaper/better than one single strong amplifier which keeps things simpler and give more control on the XO.
 
Member
Joined 2005
Paid Member
Really building with same woofer? This is super!

To clarify, I would obtain the SB woofer, not subwoofer, XO at 190hz, tweeter at 1800hz.
What I like about the SB woofer is the reasonable value of inductor, keeping the XO cost part reasonable.

My first idea was to go active with 2 amps, passive with tweeter/mid, however it is not cheaper/better than one single strong amplifier which keeps things simpler and give more control on the XO.

Yes same woofer. I'm gonna start all passive and may play with active bottom end at some point. Im gonna use the Satori mw16 or mr16, and the Satori beryllium tweeter. I'm not very adept at sims so I'm probably gonna start with in cabinet measurements. I know a little backward.
 
Dear DiYA members, I have been fomenting this speaker project for the last month and submit the premilinary XO for anyone enjoyment and constructive/destructive comments. Thank you.

It's a little difficult to give any relevant comments without knowing anything about the enclosure dimensions (including the physical driver placements), and the FR, impedance & phase data. If you could provide those, we might (might ;) ) be able to say something useful.
 
Hi Scott! Volumes:
Bass 330L vented tuned to 31hz
Mid 13L closed box

I am not sure of the boxes right now and plan to do more FR tests with the actual drivers in enclosure, the chicken or the egg?

Note: the simulator point to some problem with tweeter XO with a around -7 db suck-up if the offset is not right at many distances.

I would like to possibly get rid of the 40 ohm resistor, impedance is too high sometimes.
 

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I think to change the design and abandon the w8 and T35, even if they are almost what I would like to match perfectly tube amps.

I think the Satori NW165DC from SB will match as well as their neodymium fabric tweeters.

This is required because I had unexpected (vet) bills to pay which are more than the whole project x2. It was worth it, recovered like a miracle from paralysis, only 2 months later.
 
Yeah that driver likes a big box. I'm gonna go a little smaller with mine closer to 200- 250L.

I am changing my mind to go full scan-speak.

The reason is to simplify the XO with more linear drivers as possible.

So the new Choice of drivers would be :

illuminator R3004662000 tweeter, not going into extreme tweeters here.

Mid is the 18M, the mid range version of the very good driver

Bass the new 32W, a costly driver but with low end low distortion!, smaller but the very best.
 
I am changing my mind to go full scan-speak.

The reason is to simplify the XO with more linear drivers as possible.

So the new Choice of drivers would be :

illuminator R3004662000 tweeter, not going into extreme tweeters here.

Mid is the 18M, the mid range version of the very good driver

Bass the new 32W, a costly driver but with low end low distortion!, smaller but the very best.

What loading will you use? I like the idea of low Q sealed boxes
 
The cabinet drawing in post #8 locates the tweeter in a small box far from the midrange. Mounting the tweeter as close to the midrange as possible creates the best point-source imaging and minimizes lobing effects.

Is there a well reviewed production speaker with a cabinet shape you like and can build?

The early B&W multi-box designs with a 15" woofer might interest you. The early model 800 uses simple bevel cuts.

A stepped baffle to create tweeter - midrange time alignment has become popular, especially with +LR2 midrange and -LR2 tweeter crossovers which sum in-phase.
 

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Hi! Yes, I don't like multi woofers. I prefer the 805D over all the other ones for coherence and I prefer non port designs.

Thank you for the advice, I have no real idea of how to do driver placement except than playing with the simulators.

For time alignment, I plan to separate the mid and the tweeter in their own box over the woofer to give me more flexibility.

The woofer would be in a big box like the early B&W, never heard them which is sad...

I successfully built organ pipe like baffles with quality 12 inches, To attest to the realism of big boxes, my neighbor could not tell the difference between this and my piano!!! (sadly, big 9.5x5 plywood room boxes in corners are not convenient)so the SS 32W is a 13 inches and hopefully will be very realistic for piano low registers, I never heard a good sounding commercial speaker low end, they all sound boxy.
 
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