Building the Lhotse designed by Scottmoose

[Hondasnl]

Plan for at least today;

• adding the BR ports,
• installing the damping material,
• mounting the right side panels 😎.

Tomorrow milling the outer diameter in the baffles and connect them for breaking in and test playing them.
Later on the cabinets will be fine tuned with fine sanding and painting.

 

[Hondasnl]

BR ports installed.
Cabinets damped with the best damping material I ever used.

Thread 'Alnico-CA80 15 inch fullrange speaker'

2021-01-17 8:07 am

Never built a full-range speaker before. But I have to say that this sounds really good. Deep bass and particularly detailed highs for this speaker size. Very satisfied with the result!

Greetzzz Hondasnl

• Hondasnl
• Replies: 31
• Forum: Full Range

• 

Cabinets now closed waiting for milling the hole for the beautiful driver 😍 😍 .

 

[Hondasnl]

YEEEEESSSSSS! beautiful deep sounds here 😍😍. Breaking in those Totem poles 🤣😋👊🏽👍🏾👌🏾🥳🥳🥰🥰 Here still in the coarse cabinets that still need to be fine-tuned and finished, temporary cabling and still without the base. Sounds very very good 🤪👌.

 

[Hondasnl]

And the feets received 😍 😍😉 😎.

 

[jrKC]

Interesting bases. Are these custom? or did you repurpose a ready-made granite disc?

I integrated soapstone slabs in the base of my microTowers to add weight and to give an extremely solid (and hard) surface beneath the vent.

 

[Hondasnl]

Hi jrKC I use standard feet for parasol 🤣.
Nice format and weight 20kg.

https://www.vidaxl.nl/e/vidaxl-para...WbU1tfcimgGJ7tFFMdwTRv29dF_smVGRoC5-YQAvD_BwE

 

[Hondasnl]

I knew in advance that this is a good speaker. 😉 😎

 

[Hondasnl]

No extra overkill bracing needed for this little driver, little cross section, it will kill the performance 😉.

 

[Scottmoose]

And I've said before about you making baseless statements. Mild longitudinal bracing is optional as clearly stated in the notes, and was accounted for in the design if people wish to use it (as also stated: it's actually the default assumption for the alignment). Not being a cretin, I do actually know the effect it has, because I

a/ Designed the speaker, and
b/ Tested it to confirm the effects.

The effects were, as expected:

a/ No difference in tuning, other than without there is a 1/4dB increase in output at Fb, which is within driver, environmental, construction & measurement tolerance.
b/ A 40% (with the basic longitudinal strips assumed) increase in lateral panel rigidity -already quite good, but useful around the central bending point in particular, and if it's used to brace the motor structure to the rear of the enclosure, a small additional improvement in distortion performance. There were no other effects, nor should there be unless you place it in direct proximity to the driver without damping -which isn't a bright idea for any enclosure.

Perhaps you could share the results of your equivalent testing?

 

[Hondasnl]

What a long story. Thank you again for liking the results, my comments and recommendations on your own design. Edit: A knock test is enough 😉.

 

[jrKC]

Hi jrKC I use standard feet for parasol

I assumed that may be the case. A far more elegant solution than what’s readymade and available in the US.

 

[Hondasnl]

@jrKC 2 days delivery time here in The Netherlands 😎.

 

[Hondasnl]

I assumed that may be the case. A far more elegant solution than what’s readymade and available in the US.

Also the center elevation of the driver is better with this feet 😉 .

 

[Scottmoose]

What a long story. Thank you again for liking the results, my comments and recommendations on your own design. Edit: A knock test is enough 😉.

Ah, so you have made no testing at all then, before announcing the fiction that bracing 'kills performance' (whatever that's supposed to mean). 😉 Thank you for confirming.

Lovely build so far, though.

 

[Hondasnl]

Huh. I dont confirm anything. Only advice not to add any bracing in such a small section. Again. It will bring you noting.

 

[Scottmoose]

Okay: I've stated the facts, based on actual measurements about what the optional longitudinal bracing strips tested do, and that it doesn't 'kill performance' (whatever is meant by that). You are repeating a factually incorrect opinion with absolutely no basis, since you haven't done any stress or acoustic measurements with / without. That's what you confirmed, so again, thank you for doing so.

To repeat from a different thread (for those who mercifully haven't read it) -you will get good results without: it's not necessary, but the optional (though recommended) bracing assumed simply improves structural rigidity and lowers distortion a little, without affecting the LF loading.

 

[Hondasnl]

Again. My advice to all not to add bracing in such a small cross section. It will be over kill and eats this already small cabinet volume.

 

[zman01]

Hondasnl,

The designer of the cabinet has already stated that the volume of some bracing is accounted for in the design...

 

[Hondasnl]

Any bracing will reduce low output performance. Any bracing in such a small cross section is totally overkill.

 

[zman01]

Hondasnl,

Have you measured that by adding the bracing the LF output is getting reduced? If not measured, the claim is your opinion only.

Understand that the bracing is not absolutely necessary, but it can increase the rigidity of the cabinet; so the builder can use the bracing, or if he/she does not feel that the extra rigidity is required, not use it.

And as for bracing and low frequency output, for that to stand as a fact, measurements will have to be made before coming to a conclusion.