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maty · « **Reply #40 on:** 8 Nov 2019, 02:50 pm »

KEF R900

https://www.diyaudio.com/forums/multi-way/344527-kef-r900-crossover-upgrade.html

Optimized pictures:

maty · « **Reply #41 on:** 8 Nov 2019, 03:17 pm »

About the crossover elements like the capacitors, resistors, coils, wires, speaker connectors... this week: is DIY Audio REALLY worth it?

https://www.youtube.com/watch?v=7yozUh8xBfk

PS: the speaker inside the carton box and the crossover elements (upper quality): X-LS Encore kit

http://gr-research.com/x-lsencorekit.aspx

maty · « **Reply #42 on:** 8 Nov 2019, 05:16 pm »

-> X-LS Flat Pack Update and a Fish too

https://www.youtube.com/watch?v=-qyLOjH3s5s

Peter Rawlings videos: https://www.youtube.com/channel/UC0JRqE7rQT0g3SutYuBWBsg/videos

Five videos about X-LS, CNC.

uncola · « **Reply #43 on:** 9 Nov 2019, 04:29 pm »

I have Kef Q900 in my home theatre.. and they just don't compare to my dennis murphy New Philharmonitor bookshelf speakers with raal 64-10 and scanspeak revelator 5.5" I use in my computer near field setup.. I just opened up the q900 and the crossover is exactly like in the picture you posted.. only 4 components..

the binding post system seems the opposite of the low mass is better approach..

do you think it's worth upgrading the crossover components and hookup wire or would I be better off building dennis murphys BMR 3 way bookshelf kit that meniscus is offering now?

the kef has the virtue of being the absolute biggest speaker I can fit in my home theatre.. but it's too big to ship to for measurement from my home in hawaii

Would love your opinion
oh I use the q900's in a 2.1 setup in my home theatre with a large XTZ 3x12" ported subwoofer.. I cross it over at 80hz

forgot to add the pictures

maty · « **Reply #44 on:** 9 Nov 2019, 04:46 pm »

After watching the last video I decided that I will finally change the capacitors and resistors of my modded KEF Q100. Step by step to verify the changes, spending 85 euros (at home) in two EU shops. Two 1st order filters -> few components -> economic audiophile update!

Jantzen Superior Z-cap, Miflex KPCU (bypass, changing the added styroflex) and Mills resistors. First the bypass caps. After a while, the resistors and capacitors with the Miflex KPCU already burned in bypass.

The biggest improvement was mass addiction. Now they weigh more than the KEF LS50. I advise you to be the first thing you do if you want to spend some money.

PS: in Europe there are no Sonicaps -> Jantzen Superior Z-cap.

uncola · « **Reply #45 on:** 9 Nov 2019, 06:46 pm »

Thanks maty. I was hoping you’d reply. By mass addition you mean lining the cabinet with norez or other dampeners like rock wool? Did you upgrade your crossovers yet or still just making plans? Any idea how to get the old crossover off the plastic pins?

maty · « **Reply #46 on:** 9 Nov 2019, 06:52 pm »

With a viscoelastic material: Tecsound SY70.

https://www.audiosciencereview.com/forum/index.php?threads/video-speaker-measurements-by-danny-richie.8840/post-222794

[Spanish PDF] https://lotus.soprema.fr/www/reftechsop.nsf/($AllByUNID)/234C57F05BE834EDC12582AC00472B0B/$File/FT_INSSP002.b.ES_TECSOUND%20SY.pdf

https://en.wikipedia.org/wiki/Viscoelasticity

Old picture, from other speakers.

A good sandwich: Tecsound SY70 + acrylic + Tecsound SY70 + acrylic + fiberglass.

I made the decision, I looked for the components, the best prices and the methodology.

I will buy in a store the Milfix and the Mill. In another the Jantzen. Cheaper than the three components in the first, two shipments includes!

uncola · « **Reply #47 on:** 10 Nov 2019, 01:56 am »

I like your idea of doubling layers of damping material with a rubbery sealant in between.. what made you choose acrylic sealant over silicone? I see silicone recommended a lot

Early B. · « **Reply #48 on:** 10 Nov 2019, 03:13 am »

One thing I've learned about crossover upgrades -- don't put a wig on a pig. Ya dig?

Cheaply made speakers often aren't worth the time and money to upgrade. Start with a strong foundation -- good speakers that can be made into great speakers.

uncola · « **Reply #49 on:** 10 Nov 2019, 07:20 am »

thanks Early B. yeah after some reflection I think I might just try adding viscoelastic damping near the uni-q tweeter/midwoofer. and fixing the binding post wiring

maty · « **Reply #50 on:** 10 Nov 2019, 10:18 am »

Quote from: uncola on 10 Nov 2019, 01:56 am

I like your idea of doubling layers of damping material with a rubbery sealant in between.. what made you choose acrylic sealant over silicone? I see silicone recommended a lot

When I bought the heavy Tecsound roll 40 Kg? in a warehouse specialized in soundproofing of buildings in Tarragona (La Canonja) I asked and they recommended the cheap acrylic sealant, which does not react with fiberglass or rock wool.

When sound waves pass through different materials of different density they are much more muffled -> sandwich.

uncola · « **Reply #51 on:** 11 Nov 2019, 07:37 am »

just priced out enough dynamat to line the inside of my kef q900. I think I should just build gr research super mini instead hehe

maty · « **Reply #52 on:** 11 Nov 2019, 07:53 am »

I think the roll cost me, years ago, only € 38. You know, warehouse, without retailer margin

You can search US equivalent. Building insulation.

maty · « **Reply #53 on:** 12 Nov 2019, 08:34 pm »

Quote from: uncola on 9 Nov 2019, 06:46 pm

Thanks maty. I was hoping you’d reply. By mass addition you mean lining the cabinet with norez or other dampeners like rock wool? Did you upgrade your crossovers yet or still just making plans? Any idea how to get the old crossover off the plastic pins?

https://www.audiosciencereview.com/forum/index.php?threads/master-deals-massdrop-ebay-amazon-etc-thread-on-audio-product-sales.3118/post-265263

maty · « **Reply #54 on:** 14 Nov 2019, 11:49 am »

To finish about dampening the loudspeakers if you build them and yo do not want to spend a lot of money with expensive/commercial viscoelastic materials:

https://www.diyaudio.com/forums/multi-way/345074-mdf-plywood-speaker-cabinets-post5975306.html

maty · « **Reply #55 on:** 15 Nov 2019, 09:30 pm »

https://www.diyaudio.com/forums/multi-way/345074-mdf-plywood-speaker-cabinets-post5977153.html

Harbeth loudspeaker, inside

crossover

At least there are not electrolytics!

Early B. · « **Reply #56 on:** 15 Nov 2019, 09:51 pm »

If I'm seeking to purchase a particular audio component and don't find pics of the guts, I won't consider it. I need to see what my money is buying.

uncola · « **Reply #57 on:** 15 Nov 2019, 10:34 pm »

I feel the same way now. But I know more about amps than crossovers and cabinets.. now I know to look for bracing, damping and better crossover design and parts

214bobd · « **Reply #58 on:** 4 Dec 2019, 05:14 am »

I have a pair of new Triangle Borea BR03 bookshelf speakers that were strongly recommended by Sean of Zero Fidelity on you tube. In his review Sean indicated that these speakers would probably benefit from a crossover upgrade and cabinet reinforcement. These speakers are about the same price level as the Klipsch RP600M, to give you a reference frame. I live in the Woodlands TX, so it would be possible for me to bring the speakers to you for measurement and possible magic. How would I go about this? The speakers are 2-way, with celulose woofer/midrange driver and a silk dome tweeter.

Bob D.

Danny Richie · « **Reply #59 on:** 4 Dec 2019, 07:27 pm »

Quote from: 214bobd on 4 Dec 2019, 05:14 am

I have a pair of new Triangle Borea BR03 bookshelf speakers that were strongly recommended by Sean of Zero Fidelity on you tube. In his review Sean indicated that these speakers would probably benefit from a crossover upgrade and cabinet reinforcement. These speakers are about the same price level as the Klipsch RP600M, to give you a reference frame. I live in the Woodlands TX, so it would be possible for me to bring the speakers to you for measurement and possible magic. How would I go about this? The speakers are 2-way, with celulose woofer/midrange driver and a silk dome tweeter.

Bob D.

Hey Bob, Just give me some heads up and drive them up. We'll take some measurements and see what's going on and then figure out the best plan.