My apartment setup

MartinLogan Audio Owners Forum

Help Support MartinLogan Audio Owners Forum:

Brandon Hartwick

Well-known member
Joined
Mar 17, 2022
Messages
123
Reaction score
63
This isn't my drawing or design, but after talking with some more experienced builders this sounds like the best way to go.

I will likely be using 4 10" woofers per channel instead of 6 7" woofers, this will better match the 4' height of the panel I'm using. I'm going to run both the woofers and the ESL panel with active crossovers for now to get a feel for what frequencies I'm after.


Capaciti_esl-mk2-cad.jpg

PXL_20220623_171911730.jpg

PXL_20220623_171906521.jpg



I think before I dive in with both feet I'm going to build an active set of bookshelf speakers with some parts I have laying around. This will give me a better idea of how to use the DSP unit.
PXL_20220623_172024746.jpg
 

Robert D

Well-known member
Joined
Jul 21, 2020
Messages
1,796
Reaction score
388
Location
Ohio
This isn't my drawing or design, but after talking with some more experienced builders this sounds like the best way to go.

I will likely be using 4 10" woofers per channel instead of 6 7" woofers, this will better match the 4' height of the panel I'm using. I'm going to run both the woofers and the ESL panel with active crossovers for now to get a feel for what frequencies I'm after.


View attachment 22944
View attachment 22945
View attachment 22946


I think before I dive in with both feet I'm going to build an active set of bookshelf speakers with some parts I have laying around. This will give me a better idea of how to use the DSP unit.
View attachment 22947
Sounds really exciting. Keep us posted on how it turns out.
 

JonFo

Super Moderator
Staff member
Moderator
Joined
Jan 16, 2005
Messages
4,531
Reaction score
308
Location
Big Canoe, GA
This isn't my drawing or design, but after talking with some more experienced builders this sounds like the best way to go.
Nice, but I'd suggest adding a 'wing' to the right side of the ESL to mitigate the dipole cancellation. It could be the same width and angle as the side of the woofer tower.

What 10" drivers are you considering?

Not many will go clean to >500Hz, which is why the 7" or 8" drivers are usually used.
 

Brandon Hartwick

Well-known member
Joined
Mar 17, 2022
Messages
123
Reaction score
63
Nice, but I'd suggest adding a 'wing' to the right side of the ESL to mitigate the dipole cancellation. It could be the same width and angle as the side of the woofer tower.

What 10" drivers are you considering?

Not many will go clean to >500Hz, which is why the 7" or 8" drivers are usually used.
Thanks for the tip, I'll definitely look into adding a wing to the side of the panel.

For woofers I was looking at the paper cone Dayton Reference woofers, the frequency response looks pretty good on those.
 

Brandon Hartwick

Well-known member
Joined
Mar 17, 2022
Messages
123
Reaction score
63
In other news, I got my bookshelf speakers together last night but ran out of time to setup the DSP. One thing is for sure, I will never be a carpenter...


PXL_20220628_235821337.jpg


600V rated industrial cable for speaker wire for you wire enthusiasts
PXL_20220629_000543722.jpg

PXL_20220629_011701168.jpg


PXL_20220629_025624149.jpg


Also added another set of binding posts to my Aerius speakers so I can bypass the passive crossover. To do this you need to splice into the black/red and green wire off the step up transformer.
PXL_20220629_171024629.jpg

PXL_20220629_161416895.jpg
 

Robert D

Well-known member
Joined
Jul 21, 2020
Messages
1,796
Reaction score
388
Location
Ohio
In other news, I got my bookshelf speakers together last night but ran out of time to setup the DSP. One thing is for sure, I will never be a carpenter...


View attachment 22970

600V rated industrial cable for speaker wire for you wire enthusiasts
View attachment 22969
View attachment 22968

View attachment 22971

Also added another set of binding posts to my Aerius speakers so I can bypass the passive crossover. To do this you need to splice into the black/red and green wire off the step up transformer.
View attachment 22972
View attachment 22973
Tell us how they sound! I see your cat likes to help out. Mine is like that!
 

Brad225

Well-known member
Joined
Dec 15, 2006
Messages
1,874
Reaction score
131
Location
Wesley Chapel, Fl
We all started in woodworking with what we felt was less than perfect. It doesn't look as you describe it.

Are you going to round over the outside horizontal and vertical outside corners? I believe it is a type of standing wave issue.
Someone here will provide the proper verbiage.

Look forward to hear how they sound.
 

Brandon Hartwick

Well-known member
Joined
Mar 17, 2022
Messages
123
Reaction score
63
Adventures with DSP and active crossovers

I'm a believer, this unit is amazing. With 4 inputs and 8 outputs you have a huge amount of flexibility. It's wild being able to sit on the couch and dial everything in on the fly with a laptop.

Last night I got the bookshelf speakers setup and we're they ever harsh, with all levels equal they were pretty brutal. But with a little level adjustment between the tweeter and woofer they're actually really good, very smooth and extremely detailed, probably the most detailed small speaker I own. At some point I'll bring them back to my shop and finish them for real.

I also decided to hook up the Martin Logan's directly to the amps and bypass both internal crossovers completely. The old Jeff Rowland amp handles direct driving the panel with no problems at all, even at high volume. Using 24bd/octave active crossovers at the stock 450hz gave best results and the speakers sound as good or better than running with the passive X over. Tonight I'll play around with it some more but this looks very promising.

Those of you still running passive bass sections are really missing out big time. I'm never going back.

PXL_20220630_012849720.jpg

PXL_20220630_013437507.jpg
 

Brandon Hartwick

Well-known member
Joined
Mar 17, 2022
Messages
123
Reaction score
63
What software are you using for the crossover and DSP? That looks really nice.
It's Dayton Audio software to pair with the DSP-408 unit. It's really easy to use and setup, I highly recommend it and so far it also seems sonically transparent. Pair this with Room EQ Wizard you could really dial things in exactly how you like it, last night I had really good results just doing adjustments by ear.
 
Last edited:

JonFo

Super Moderator
Staff member
Moderator
Joined
Jan 16, 2005
Messages
4,531
Reaction score
308
Location
Big Canoe, GA
I installed a giant stack of subwoofers this weekend. This actually works extremely well, the bass is fast, clean and you can feel it in your chest. This sounds way better than the single 12" I had previously.
Nice, that forms a line array that should improve far-field energy in the upper ranges of the subs, and better distribute vertical room modes (vs a single sub on the floor). You definitely have much more 45 - 120Hz energy in the room, which is why you get more chest-slam.

I would use REW to measure that you do not have room modes from the single location. Maybe more subs just to balance out might be required, or tons of acoustical treatments.
 

JonFo

Super Moderator
Staff member
Moderator
Joined
Jan 16, 2005
Messages
4,531
Reaction score
308
Location
Big Canoe, GA
I highly recommend doing the active crossover modification on any Martin Logan speaker that uses a passive woofer crossover, the improvement is huge.
+10

Been saying this since the forum started back in 2005, even a less than ideal active XO beats passives. A well tuned DSP XO is another world.

With the Monolith III, it's even a piece of cake, as the speaker binding posts are post XO (Monolith Passive is in an external box), so zero mods.
 

JonFo

Super Moderator
Staff member
Moderator
Joined
Jan 16, 2005
Messages
4,531
Reaction score
308
Location
Big Canoe, GA
I told myself I wouldn't do this, but here we are.

I am soon to acquire a pair of nearly new panels from a pair of ML Quest's, I already have the electronics I need minus crossovers. I will be designing woofer enclosures and panel frames from scratch out of laser cut steel.
Oh, that looks very cool, and using metal for the frames is the hot ticket.

Let's hook up via PM to discuss a future project I have in mind for the next iteration of life for my Sequel speakers.
I plan to repanel them in 2023, and the old Nextel-covered boxes are pretty tired after 29 years, the cost of stripping and refinishing is not worth it, plus I want to match my center setup with a line array of mid-bass drivers. Oh, and the panel will be in a monopole enclosure. You know, kind of like my Monoray design :cool:
 

JonFo

Super Moderator
Staff member
Moderator
Joined
Jan 16, 2005
Messages
4,531
Reaction score
308
Location
Big Canoe, GA
Using 24bd/octave active crossovers at the stock 450hz gave best results and the speakers sound as good or better than running with the passive X over. Tonight I'll play around with it some more but this looks very promising.

Those of you still running passive bass sections are really missing out big time. I'm never going back.
Yep, simply bypassing the passive woofer XO is the low-hanging fruit for these older models, no mods are required on most of the models either, just disconnect the straps briding the terminals.

Steep crossovers on the High-pass to the panel are key, and 350 to 500Hz is the range, depending on panel and room setup. Yes, even the massively huge Monolith panels should only see 330Hz at the lowest, but work best at 35 to 400Hz. Most of the others are where you wound up with yours, Brandon, at 450Hz.

Do use REW to measure the impulse responses of each driver individually and time-align if the DSP has that adjustment and sufficient resolution. The sloped SL3 might not need it, but vertically alinged models (Sequel, Monolith) do need 1.xms of delay to the panel.

Also, use Group Delay curves to time align the subs to the mains. What you are looking for is the least variation across frequencies. The curve will never be flat, but removing any peaks/troughs is a win, indicating better phase alignment across the system. Changes in delay as small as 1ms have measurable impact. And if set correctly, result is some of the best overall bass response ever.
 
Top