Classified Section Wed, 15 Apr 2026 09:47:30 +0000 Wed, 15 Apr 2026 09:47:30 +0000 HiFiCircuit http://www.hificircuit.com/community/forums/classified-section.37/ Thu, 02 Apr 2026 17:54:26 +0000 http://www.hificircuit.com/community/threads/ht-12-upgrade-crossover.5891/ http://www.hificircuit.com/community/threads/ht-12-upgrade-crossover.5891/ invalid@example.com (Matt Grant) Matt Grant
There seems to have been some confusion about this crossover and I've edited the description below to try and clarify things:

The HT line was initially designed as high value home theater speaker kits with maximizing price to performance as one of the main goals. As such the the crossover was designed to squeeze as much out of a fairly simple and easy to assemble design as possible.

More recently I was...

HT-12+ Upgrade Crossover]]> 18 Thu, 15 Jan 2026 01:03:38 +0000 http://www.hificircuit.com/community/threads/4-eminence-nsw6021s-for-sale-new-used.5949/ http://www.hificircuit.com/community/threads/4-eminence-nsw6021s-for-sale-new-used.5949/ invalid@example.com (soundbuilder) soundbuilder
(4) Eminence NSW6021's for sale, new/used]]> 1 Sun, 30 Nov 2025 00:16:41 +0000 http://www.hificircuit.com/community/threads/fs-new-old-stock-diysg-concentric-8-coaxial-drivers.5947/ http://www.hificircuit.com/community/threads/fs-new-old-stock-diysg-concentric-8-coaxial-drivers.5947/ invalid@example.com (Matt Grant) Matt Grant Info:
Buried in the DIYSG warehouse were several dozen new Concentric-8 drivers, Erich and I dug them out on my recent visit and I've been slowly giving each a QC check and now have many tested and available for purchase. I also grabbed a smaller number of Concentric-6 drivers too.

These were higher end coaxials with better dispersion characteristics then the Volt-8, much...

FS: New Old Stock DIYSG Concentric-8 Coaxial Drivers]]> 24 Tue, 18 Nov 2025 17:11:00 +0000 http://www.hificircuit.com/community/threads/fs-four-concentric-6-drivers-w-bamboo-baffles-plus-pcb-unused.5953/ http://www.hificircuit.com/community/threads/fs-four-concentric-6-drivers-w-bamboo-baffles-plus-pcb-unused.5953/ invalid@example.com (Brinkman) Brinkman here.

These would be great for surrounds. I had Volt-6 surrounds and these were originally planned as upgrades before life got in the way. With the exception of a small blemish on one of the bamboo baffles (a small void I filled), these are unused and as I received them.

I’m asking $100 each, plus...

FS: four Concentric 6 drivers w/bamboo baffles plus PCB. Unused.]]> 3 Tue, 15 Jul 2025 17:28:38 +0000 http://www.hificircuit.com/community/threads/wtb-vortex-15s.5961/ http://www.hificircuit.com/community/threads/wtb-vortex-15s.5961/ invalid@example.com (Feurkils) Feurkils 2 Wed, 11 Sep 2024 03:04:04 +0000 http://www.hificircuit.com/community/threads/need-2-eminence-15-buyout-sub-drivers-please-reach-out-if-you-have-available-for-purchase-thanks.5960/ http://www.hificircuit.com/community/threads/need-2-eminence-15-buyout-sub-drivers-please-reach-out-if-you-have-available-for-purchase-thanks.5960/ invalid@example.com (Jeffry Ames) Jeffry Ames Fri, 09 Aug 2024 01:50:29 +0000 http://www.hificircuit.com/community/threads/3x-ht-12-sold.5955/ http://www.hificircuit.com/community/threads/3x-ht-12-sold.5955/ invalid@example.com (Kahuna.) Kahuna.
They are still sealed in unopened boxes from Erich.

SOLD. Can arrange shipping at cost if required.]]> 3 Fri, 19 Jan 2024 06:37:03 +0000 http://www.hificircuit.com/community/threads/fs-concentric-6-coaxial-drivers.5794/ http://www.hificircuit.com/community/threads/fs-concentric-6-coaxial-drivers.5794/ invalid@example.com (Matt Grant) Matt Grant Update January 2024:
--All Sold!--

Price:
Concentric-6 coaxial driver - $120 + shipping (I will throw in the bare crossover PCB)

Additional options:
Fully assembled crossover for the Concentric-6 - $60 (built to order).
CNC cut MDF Baffles - $10 each (multiple size options)

• 11.75" H x 8" W - Standard baffle size, driver centered on baffle.

• 16" H x 8.5" W - Baffle for larger ported cabinet, driver...

FS: Concentric-6 Coaxial Drivers!]]> 35 Sat, 30 Dec 2023 17:01:01 +0000 http://www.hificircuit.com/community/threads/wtb-diysg-vortex-12-or-15.5946/ http://www.hificircuit.com/community/threads/wtb-diysg-vortex-12-or-15.5946/ invalid@example.com (Jim) Jim
Reach out if you have any questions!]]> 5 Tue, 29 Aug 2023 21:31:20 +0000 http://www.hificircuit.com/community/threads/3-1099-with-horizontal-center.5945/ http://www.hificircuit.com/community/threads/3-1099-with-horizontal-center.5945/ invalid@example.com (JohnDean) JohnDean
I have pictures but it's just the boxes. They are too large to load but I can send them if you'd like.

Will meet within reasonable distance of Nashville,...

3 - 1099 with horizontal center]]> 2 Thu, 25 May 2023 02:13:04 +0000 http://www.hificircuit.com/community/threads/wtb-single-vortex-15-kit-or-complete-speaker.5936/ http://www.hificircuit.com/community/threads/wtb-single-vortex-15-kit-or-complete-speaker.5936/ invalid@example.com (Pilk) Pilk 7pilks@gmail.com

Edit...2 found...need one more. Would also consider a Vortex 12 kit or complete speaker. Thanks]]> 3 Thu, 04 Aug 2022 16:12:23 +0000 http://www.hificircuit.com/community/threads/vortex-15-drivers-and-pcbs.5917/ http://www.hificircuit.com/community/threads/vortex-15-drivers-and-pcbs.5917/ invalid@example.com (tomlang) tomlang
$550 shipped 48 states from Asheville, NC]]> 7 Mon, 01 Aug 2022 22:28:28 +0000 http://www.hificircuit.com/community/threads/crossover-pcbs-for-many-speaker-designs-on-diysg.1641/ http://www.hificircuit.com/community/threads/crossover-pcbs-for-many-speaker-designs-on-diysg.1641/ invalid@example.com (Matt Grant) Matt Grant
All boards include snap in standoffs and mounting screws (you can see them in the photos of the smaller boards) as well as terminal blocks. Shipping within the US is included in price.

If you are interested in purchasing any of the boards feel free to send me an email: mtg90 (at) msn.com...

Crossover PCB's for many speaker designs on DIYSG]]> 34 Sun, 12 Dec 2021 00:51:45 +0000 http://www.hificircuit.com/community/threads/wtb-magnum-12-woofer.5902/ http://www.hificircuit.com/community/threads/wtb-magnum-12-woofer.5902/ invalid@example.com (Jack) Jack Wed, 06 Oct 2021 23:07:03 +0000 http://www.hificircuit.com/community/threads/wtb-fusion-4-quad-4.5803/ http://www.hificircuit.com/community/threads/wtb-fusion-4-quad-4.5803/ invalid@example.com (Ceedubbya) Ceedubbya
I live in Vancouver, WA.

thanks.]]> 3 Wed, 29 Sep 2021 20:16:13 +0000 http://www.hificircuit.com/community/threads/wtb-maximus-12.5852/ http://www.hificircuit.com/community/threads/wtb-maximus-12.5852/ invalid@example.com (matt996) matt996
I've been bugging Erich for too many months asking if he could find me the parts for the Maximus 12. I missed the boat on this kit and *really* regret it.

So...If you have the kit, or drivers, or even just a pair of the Denovo FL-450 compression drivers you would be willing to sell, please let me know.]]> Wed, 22 Sep 2021 14:13:50 +0000 http://www.hificircuit.com/community/threads/fs-2x-htm-12-kits-w-assembled-crossovers-dc-area.5842/ http://www.hificircuit.com/community/threads/fs-2x-htm-12-kits-w-assembled-crossovers-dc-area.5842/ invalid@example.com (Severian) Severian
The kits are complete with the flatpacks and assembled crossovers and still in the boxes. I opened one box to take a look around. I also have a pair of the nice Dayton binding posts that...

FS: 2x HTM-12 Kits w/Assembled Crossovers (DC area)]]> Wed, 01 Sep 2021 13:21:06 +0000 http://www.hificircuit.com/community/threads/wtb-volts-used-or-nib.5621/ http://www.hificircuit.com/community/threads/wtb-volts-used-or-nib.5621/ invalid@example.com (howard) howard 2 Sun, 29 Aug 2021 18:09:36 +0000 http://www.hificircuit.com/community/threads/apollo-mtm-mt-x2ea-volt-6-x2-dayton-15-dual-passive-w-spa1000-svs-sb12-nsd-outlaw-audio.5817/ http://www.hificircuit.com/community/threads/apollo-mtm-mt-x2ea-volt-6-x2-dayton-15-dual-passive-w-spa1000-svs-sb12-nsd-outlaw-audio.5817/ invalid@example.com (Brian) Brian More pictures & receipts available. All DIYSG speaker enclosures are already built (x-overs assembled) but NOT finished or veneered. RR2160 has minor blemishes on unit. Everything else is in "Like New" condition. I built a home theater that never got finished and now moving out of that home. No pets or smoking. Willing to sell items individually or as an entire package. Buyer pays for shipping costs. Listed...

Apollo MTM & MT x2ea, Volt 6 x2, Dayton 15" Dual Passive w/ SPA1000, SVS SB12-NSD, Outlaw Audio]]> Sun, 11 Apr 2021 17:46:09 +0000 http://www.hificircuit.com/community/threads/wtb-fusion-4-quad-4-center-channel.5628/ http://www.hificircuit.com/community/threads/wtb-fusion-4-quad-4-center-channel.5628/ invalid@example.com (Barry) Barry 7 Tue, 16 Mar 2021 17:50:39 +0000 http://www.hificircuit.com/community/threads/seos-12-horns-d220ti-drivers-xover-parts-etc.5800/ http://www.hificircuit.com/community/threads/seos-12-horns-d220ti-drivers-xover-parts-etc.5800/ invalid@example.com (tomlang) tomlang Sun, 24 Jan 2021 03:30:04 +0000 http://www.hificircuit.com/community/threads/moving-sale-volt-6-drivers.5751/ http://www.hificircuit.com/community/threads/moving-sale-volt-6-drivers.5751/ invalid@example.com (LuisV) LuisV
]]> 6 Sun, 03 Jan 2021 22:33:31 +0000 http://www.hificircuit.com/community/threads/wtb-dna360-comp-drivers.5788/ http://www.hificircuit.com/community/threads/wtb-dna360-comp-drivers.5788/ invalid@example.com (Burnsze15) Burnsze15 Tue, 10 Nov 2020 04:27:35 +0000 http://www.hificircuit.com/community/threads/beyma-mid-bass-8-mi-100-pair-for-sale.5762/ http://www.hificircuit.com/community/threads/beyma-mid-bass-8-mi-100-pair-for-sale.5762/ invalid@example.com (pjuul) pjuul Tue, 06 Aug 2019 22:17:07 +0000 http://www.hificircuit.com/community/threads/sold-x-4-diysg-volt-10-kits-atmos-packs-x2-assembled-xovers.5625/ http://www.hificircuit.com/community/threads/sold-x-4-diysg-volt-10-kits-atmos-packs-x2-assembled-xovers.5625/ invalid@example.com (idratherbeflying) idratherbeflying
All items sold. Thanks for everyone's interest.


Selling four of the DIYSG's Volt 10s kits... all NIB

All are $120 per pair, plus shipping.

• Two are LX kits from 2015. The crossovers were assembled by DIYSG.

• Two are the 2018 version of the kits, and do include the 400 uF cap for the Atmos option. One of the caps lost part of a lead and would need vertical mounting to use it. No big deal and they are $5.83 at Parts Express if you want that...

SOLD - x 4 DIYSG Volt 10 Kits; ATMOS packs, x2 assembled xovers,]]>