12 replies to this topic

[Stone]

Hey,

I need help!

I've decided my fronts sound good enough and I don't need to install my rears, so I have spare Boston Pro60's and an Audison LRx2.500 (200Wrms x 2 @ 13.8v)... I'm currently running my Z6's from another LRx2.500 but i'm thinking about using both amps for the Z6's. With the one amp via the passive xover both the woofer and tweeter have 180Wrms available... If I bi-amped them each component would still only have 180Wrms. So I don't see a huge benefit. I could bridge each amp to each side to give 660Wrms per side but then the THD would come up. Would you hear it?

I really have no idea! Please help

Oh, and i'd really like to stick with the passives as i'm sure they'll sound better than any tuning I could do anyway but my head unit is capable of doing 3-way setup.

[edit] Oh, and another option is to sell the two Audisons and buy a Boston GT-28.

[Winno]

That's a tough one there.

I reckon it'll work very well but you'd simply have to hook it up and see.
One amp for tops and the other for mids.
I do have experience with bi-amping some pretty esoteric home audio gear with nice results. I used to be paid to play with (and sell) very, very nice gear a few years ago.

I guess the offshoot from that is you could try running active then just to see what that is like as well once it's all in...

Edited by Winno, 26 April 2007 - 09:31 PM.

[Pulse-R]

in a good amp, distortion only increases at rated power. I believe the Audisons are good amps.

turn it down = lower distortion.

as for bi-amping, only a real bonus if you want to use TA, or better quality amp for tweeters.

[Stooge007]

i'd also try it and see

want to sell the pro's?

- Stooge007 out

[shiny_car]

yeah, time correction, level-matching, and some improvement in dynamics/attack-decay are what's potentially on offer.

and i think you'll get a good improvement, so i'd do it.

i presume the boston passive xovers cater for bi-amping? would be nice to retain the passives.

[StormSQ]

I'm running my setup as bi-amp (in a way)..using a 4 chan amp with 2 chans for the tweeters and 2 chans for the mid bass.

I haven't messed with the levels but using the passives that come with the speakers is a good idea I think. They don't spend all those $ on R&D for nothing!

At the end of the day its given the system far more clarity and can go the distance on the volume.

[mad89]

i vote for biamping with the boston crossovers

i was going to say to run a 2.500 per side, as in one for left one for right, but i dont think they have independant gains for each channel do they?

if not, then go one 2.500 for mids, and one for tweets. as already mentioned this gives the most control (within a passive setup) as u can TA seperately, and have independant gains between mid and tweet.

let us know how it goes!

[muzzy66]

Bi-amp for sure.



Individual level control over your mids and tweeters is critical so I'd go for it for sure if the option is there.

[Stone]

Looks like i'll be giving the bi-amping a go in the near future then

And yeah, the passives have the option for bi-amping.

[Damo95]

mad89, on Apr 27 2007, 11:38 AM, said:

i was going to say to run a 2.500 per side, as in one for left one for right, but i dont think they have independant gains for each channel do they?

run 1 amp per side is another option.. i've done that in mine... works well, and ultimate channel separation and you can still bi-amp if you want.. or bridge per side..



if you dont wanna do that, and your crossovers allow for bi-amping.. do it! you wont look back...

[RMA]

Bi Amp is an improvement for sure.

As you have two LRx amps you can band pass them if you wish by using the bypass output which will output where you cut off the frequency or option two is to bi amp the Boston crossovers and have the Audison crossovers wide open.



In either case there should be a marked improvement.

[Stone]

Thanks. I'll leave the amp's crossovers open and use the head unit's bandpass and high pass features along with the passive crossovers.

The only concern I have is setting the gain for tweeters... How do you hear them distort without damaging them?

[shiny_car]

how did you tune them before? i expect you tuned it to 'below clipping' or to a level where the door woofers weren't distortion.

so, i would first tune the door woofers, per normal. then simply tune in the tweeters to achieve the ideal balance. you are unlikely to need to feed the tweeters a lot more power than before, so risk of overpowering them should be low.

and perhaps the passive xover have inbuilt tweeter protection circuitry?