Author Topic: Signal path quandry (Read 417 times)

palembic · « **Reply #15 on:** March 01, 2004, 09:11:15 AM »

About Acme: anybody tried the Bi-amping set up where a B2W is underneath a B2 normal? I just read about it on their website.

TX

Paul the bad one

bassman10096 · « **Reply #16 on:** March 01, 2004, 10:34:00 AM »

Hi Paul: I'm curous about the same thing. I've been considering Acmes. If I went with them, would biamp a pair of LowB2's. But clearly, my style of play would not require both cab's to have mid and tweeter. Just one running full range and the other running just like a LowB2W. I really don't want to buy a W if the mid and tweeter can be fully attenuated using the controls on the back of one of the cabinets. A W is essentially just a sub, while for $100 more, I can have a more versatile, full range version of the same cabinet. I Emailed Andy at Acme just now to find out if full attenuation is possible.

I'd be interested if anyone out there has tried what you are suggesting, as it sounds like the most intuitive way for me to set up am Acme rig.

Bill

(Message edited by bassman10096 on March 01, 2004)

(Message edited by bassman10096 on March 01, 2004)

dnburgess · « **Reply #17 on:** March 01, 2004, 12:30:29 PM »

I am getting a Low B-2W in my next shipment to experiment with various setups. So I'll report back.

Andy Lewis at Acme recommends that when being used together the B-2 and B-2W should both be driven full range.

Bill: The attenuators on the mid and tweet give 20dB cut.
And, yes, I did buy the vermillion Epic - I look forward to checking it out.

bob · « **Reply #18 on:** March 01, 2004, 07:53:56 PM »

David,

20dB cut - at what frequencies? Or more generally, do you know where the crossover points are? And does the B2W stop at the same point, or does it go a bit higher? (presumably there is no crossover).

Not shopping, just curious.

bob · « **Reply #19 on:** March 01, 2004, 07:57:04 PM »

(removed double post)

(Message edited by bob on March 01, 2004)

David Houck · « **Reply #20 on:** March 02, 2004, 05:27:14 AM »

Bob; I was unable to find the crossover points in the owners manual or on the web site. However, the owner's manual includes a reprint of a Bassplayer magazine article which gives the crossover points as 1kHz and 9kHz. The article is from 1996 but it appears from what I've read in the manual and on the web site that the crossover hasn't changed since then except for the addition of a protection circuit.

The web site states that the B-2W is identical to the B-2 ... but without the midrange and tweeter. So perhaps that means a low-pass setting of 1kHz.

dnburgess · « **Reply #21 on:** March 03, 2004, 01:30:19 AM »

As far as I'm aware there is no crossover or filter in the B2W - just not much output above 1000Hz.

BTW, Acme full range speakers are not biampable - i.e. there are only full range inputs.

David B.

peter_jonas · « **Reply #22 on:** March 03, 2004, 01:56:43 AM »

Ezra,

Just returning to the original topic, it certainly seems a good idea from a number of points of view to have the SF-2 after the F-2B, but I have found that using a Series I bass connected to (the less sensitive) input 2 of the F-2B, the SF-2 can so easily be driven into clipping. The clipped signals sound really aweful, and, as in some respects they are very similar to square waves, they can easily damage your speaker if you are running close to the speaker's limit when this happens.

I have had several discusions about this problem to various people, but noone else seems to be having similar trouble. If I turn the volume on the F-2B to 4 or beyond, even moderate playing will cause this to happen. Have any of you guys observed this? Maybe its just my SF-2.

On the other hand, as Dave Houck suggests it is probably a good idea to keep the tuner out of the direct signal chain, and try to feed it from a secondary output in perhaps the effects unit (whatever that may turn out to be). However, I would not suggest to use the mono output on the F-2B for this purpose, as this is not a buffered output, and as soon as you place a plug in the mono output jack, mixing resistors are switched into circuit, which will seriously impair channel separation and output impedance of the stereo outputs. I do not think the mono and stereo outputs are intended to be used concurrently.

Cheers.

Peter Jonas

David Houck · « **Reply #23 on:** March 03, 2004, 06:10:52 AM »

Peter, good point about the mono output; thanks. I have an F-1X instead of an F-2B, so I wasn't sure if the mono output would work.

wayne · « **Reply #24 on:** March 03, 2004, 08:32:37 AM »

You can keep the tuner out of the signal path by using the secondary output jacks on the back of the DS-5R.

You only lose the ability to mute the output to the speakers while tuning - that is unless you simply turn the volume down on the amp....

C-Ya............wayne

peter_jonas · « **Reply #25 on:** March 03, 2004, 12:58:44 PM »

Dave,

You are quite right about the F-1X, its output stage is different. I used to have one in my rack. I used the full range output to drive the power amp, and I fed the tuner from the bass output. It worked quite well.

Since I've had the F-2B I've been using a secondary line output of the compressor I've got just before the power amp. That is also OK.

Cheers,

Peter

ezra · « **Reply #26 on:** March 04, 2004, 02:44:52 AM »

Thanks everyone for the input. Still haven't finalized the path yet.
Peter thanks for the heads up on not using the mono and stereo outs simultaneuosly. Curious as to what happens if you plug your series bass into the #1 inputs on the F2B.
Wayne thanks for the advice on using the secondary outputs on the back of the DS5R.
Will keep you guys apprised as things come together, as I have a few options to try now.

ezra