Anyone running with separate amp and active crossover for their bass drivers

Bumpy · « **Reply #40 on:** 14 Feb 2019, 01:09 pm »

Quote from: gils on 13 Feb 2019, 12:47 am

The Altec 416 of very good quality could be tuned from 80 Hz to 2 Khz and use a loudspeaker for bass with high QTS to reproduce the bass.
I will try to find a good quality speaker in 10 " whatever his QTS, there I think will be the right solution, the pickups when taking his sound were 2 m from the speaker.

Thanks for the advice Gilles, but this wont work for me. My mid range driver works beautifully down to about 100Hz and has the added sonic benefit that it does not require a crossover. So I would just need a quality sub up to 100Hz. I will give the Altec 416 a go with DSP.

If that fails, this driver has caught my eye.

http://www.pureaudioproject.com/product/15inch-open-baffle-bass-woofers/

Or this

https://www.lean-business.co.uk/eshop/faitalpro-15pr400-8ohm-15-400watt-pa-speaker-p-1381.html

gab · « **Reply #41 on:** 14 Feb 2019, 03:30 pm »

Quote from: Bumpy on 14 Feb 2019, 01:09 pm

Or this

https://www.lean-business.co.uk/eshop/faitalpro-15pr400-8ohm-15-400watt-pa-speaker-p-1381.html

Study the Troels Graveson site for his OBL-11 and OBL-15 designs. The OBL-15 uses the 15PF400 driver and the crossover components are listed.

gab

Bumpy · « **Reply #42 on:** 14 Feb 2019, 03:40 pm »

Thanks Gab for the link. At about 100Hz I suspect I will be crossing a lot lower than Troels

Bumpy · « **Reply #43 on:** 15 Feb 2019, 10:24 am »

Does anyone have any views on which driver is best up to say 120hz?

I am gravitating towards the Pure Audio which was optimised for open baffle

matevana · « **Reply #44 on:** 15 Feb 2019, 02:54 pm »

Quote from: Bumpy on 15 Feb 2019, 10:24 am

Does anyone have any views on which driver is best up to say 120hz?

I am gravitating towards the Pure Audio which was optimised for open baffle

Honestly, I'd love to get my hands on a pair of Altec 416's. I think you should definitely give the DSP option a try before moving on to another bass driver. Even a dedicated plate amp w/xo should do the trick (you can opt for built-in boost around 25Hz if you like)

gils · « **Reply #45 on:** 15 Feb 2019, 10:00 pm »

https://www.ebay.fr/itm/2-haut-parleurs-ALTEC-416-16B-ALNICO-/202572381319?_trksid=p2385738.m4383.l4275.c10

best regards

gils · « **Reply #46 on:** 15 Feb 2019, 10:49 pm »

My infraflex + Altec 416 (VOTT)

best regards

Bumpy · « **Reply #47 on:** 15 Feb 2019, 11:01 pm »

Quote from: gils on 15 Feb 2019, 10:00 pm

https://www.ebay.fr/itm/2-haut-parleurs-ALTEC-416-16B-ALNICO-/202572381319?_trksid=p2385738.m4383.l4275.c10

best regards

I think those are 16 ohms. The 8 ohm version is a bit rarer.

gils · « **Reply #48 on:** 16 Feb 2019, 12:18 am »

hello,

I listened to Altec 416 8b, it's a fairly common HP, why this obsolete HP not found?

http://www.loudspeakerdatabase.com/search/14.0_size_in_15.0/4_z_8/95.0_spl_118.0/8_fs_35/0.30_qts_0.70

best regards Gilles

JDUBS · « **Reply #49 on:** 16 Feb 2019, 11:14 pm »

I use a wyred4sound mpre with its dual outputs....one set goes to an amp that drives a passive crossover-based "upper" section (the top part of GR Research's Super Vj....a 2-way coaxial) and the other set goes to an iNuke for powering my bass speakerss (sealed kit based on the Dayton Audio 12" Reference Series driver).

The upper sections rolls in at ~190hz and the lower section covers 20hz to 190hz. I use the DSP of the iNuke to room correct the bass response....and with only 1.3ms added delay, it really blends seemlessly with the upper section.

I really love the setup.

-Jim

Bumpy · « **Reply #50 on:** 17 Feb 2019, 09:32 am »

Quote from: JDUBS on 16 Feb 2019, 11:14 pm

I use a wyred4sound mpre with its dual outputs....one set goes to an amp that drives a passive crossover-based "upper" section (the top part of GR Research's Super Vj....a 2-way coaxial) and the other set goes to an iNuke for powering my bass speakerss (sealed kit based on the Dayton Audio 12" Reference Series driver).

The upper sections rolls in at ~190hz and the lower section covers 20hz to 190hz. I use the DSP of the iNuke to room correct the bass response....and with only 1.3ms added delay, it really blends seemlessly with the upper section.

I really love the setup.

-Jim

Thanks for sharing Jim. You are 'lucky' enough to have a preamp with dual RCA outputs - nice feature.

Tyson · « **Reply #51 on:** 17 Feb 2019, 09:55 pm »

Any preamp can drive a main amp and a sub amp - you just need a good quality Y-spitter.

JDUBS · « **Reply #52 on:** 18 Feb 2019, 03:14 am »

Quote from: Bumpy on 17 Feb 2019, 09:32 am

Thanks for sharing Jim. You are 'lucky' enough to have a preamp with dual RCA outputs - nice feature.

Yeah, its a great preamp. It has a pair of balanced AND unbalanced outputs!

-Jim

rajacat · « **Reply #53 on:** 18 Feb 2019, 07:53 pm »

I use a Crown XLS 1502 with its built in crossover to power my AE TD15M 15" drivers. Sounds good to me and worth the trade off and nerdy hassle of trying to formulate a traditional crossover.

erkki · « **Reply #54 on:** 5 Mar 2019, 02:39 pm »

I am using passive XO in mid/high coaxial driver. Bass/mid XO is active, with 2x4HD. Amplifier: Denon AV amp, modified to separate pre-out from main amp inputs. Something like 100W/ch. MiniDSP provides the XO and baffle EQ for all channels. Also moderate room EQ.
Bass unit has 20cm U-frame, but mid is in open baffle area.
https://www.audiocircle.com/index.php?topic=121548.msg1687771#msg1687771

Bumpy · « **Reply #55 on:** 10 Mar 2019, 12:43 pm »

Quote from: rajacat on 18 Feb 2019, 07:53 pm

I use a Crown XLS 1502 with its built in crossover to power my AE TD15M 15" drivers. Sounds good to me and worth the trade off and nerdy hassle of trying to formulate a traditional crossover.

Does it have a fan?

Tyson · « **Reply #56 on:** 13 Mar 2019, 04:40 pm »

BTW, the GR Research Super 7 kit with active bass already built out for you is now shipping. Check out the GR Research circle here on AC. In addition, I see that Spatial Audio just announced the X3 and X5, both of which will have active bass sections.

rajacat · « **Reply #57 on:** 14 Mar 2019, 01:05 am »

Quote from: Bumpy on 10 Mar 2019, 12:43 pm

Does it have a fan?

I believe that my two Crowns have fans but I've never heard them probably because I don't push them very hard. I use one for my 15'" woofs and the other for a pair of folded horn subs. My tweets run off of Heathkit monoblocks or small digital amp with a pair of Fostex transformer attenuators and with no crossovers.

dcbingaman · « **Reply #58 on:** 12 Sep 2019, 11:57 pm »

I am working on a Pass SLOB (Slot Loaded Open Baffle) with a 15" Eminence driver on the bottom and a Cube Audio FC8 full range driver on the top. Jeff McCabe will build the cabinets for me. The X-Over will be built into a DIY preamp using PC boards from DIYAudio, and Pass's LxMini and NuTube circuits. The NuTube will provide the gain, volume and balance controls and input selector switching. The LXMini will provide the crossover and EQ, based on Pass's experiments at his studio in Sea Ranch, CA. Level setting between the upper and lower amps will be accomplished using pink noise, an iPhone hosted RTM app, and the Studio Six Digital iTestMic2.

Amplifiers: Low pass: Aleph 5 (90 watts) and DIY First Watt F5 Turbo V2 (140 watts). High pass: First Watt J2 (25 watts), DIY Pass / Sony VFET (15 watts), and an Elekit TU-8600 (9 300B watts).

Here's some pics:

Shakeydeal · « **Reply #59 on:** 13 Sep 2019, 10:59 am »

As Tyson mentioned several months ago in this thread, the Spatial Audio X-3 has now hit the streets. This is a fantastic OB speaker with powered 15" woofer onboard. If anyone is looking for something like that, I highly recommend it.

Shakey