Powering my 1.2tls

10bad10

Hey all just trying to get some advice on powering my set of 1.2tls. Im planning on using an Onkyo M-508 (a generous 200 WPC). Would that be enough to make them sing or at least sound good.

Thanks

-David

BB3

David,

First off, that is a very nice Amp you've got there in that Onkyo. I absolutely love those green meters. Just awesome.

Now to your question.....yes your amp will power your SDA's quite nicely, but if I were you I would be like a man posessed in finding myself another Onkyo M-508 to go along with your current setup.

Meaning, and not that you don't have it figured out yet, but if you were to Bi-Amp your SDA's with two wonderful Onkyo's, I suspect / know you will be totally blown away like I am with my setup.

Take care of yourself David and let me know if you have any questions.

---

Bill (BB3)

nooshinjohn

be careful when using two stereo amps to Bi-amp the sda's as the speakers require a common ground scenario or amps and speakers can be severely damaged.

michaeljhsda2

Biamping is not a problem...it only becomes a problem if you try to run them bridged mono. For that you will need an AI-1 interconnect.

nooshinjohn

bridged mono is what will cause a Chernobyl-like meltdown in your very own home. Biamping with monoblocks is the best way to get the job done and then only if either the negative terminals of the amps can be strapped together or if the AI-1 interconnect is used. Under no circumstance should amps be used in bridged mono configuration with SDA's... Thanks Mike for helping me think on this one.

michaeljhsda2

You're welcome John....so does this mean I win the Plate Karma...lol

nooshinjohn

michaeljhsda2 wrote: »

You're welcome John....so does this mean I win the Plate Karma...lol

ummm no;)

hearingimpared

You can bi-amp the 1.2tls with two separate stereo amps with no problem as long as the amps individually are common ground.

10bad10

Hey guys thanks for all the help. Im always looking to pick up another M-508 and now i really have a reason. I just got the Polkies today off of CL but was keeping it quiet until they were home. How can i figure out if i have SRSs, 1.2s or 1.2tls? Im alittle new to SDA.... always wanted a pair and never expected to get as good of a pair as i just did for $400 yes thats $400 (talked him down from $500).

p.s. speakers are 8.5 out of 10 and had both grills in nice conddition and the interconnect cable. He also gave me some monster cable and a moving blanket to cover theem with lol. Man am i out off my mind stoked.... o yeah only one 6.5 is blowwn out of the 16... i d/ced it and am going to attempt to fire them up wwith my M-508. Anything i should know/do before take off.

Sorry for the long post i ramble when im excited

-David

megasat16

Hi David,

$400 for a SRS 1.2 or 1.2TL is a steal of the year! You should do well with M-508 bi-amping the 1.2s or 1.2tls. But M-508 is Dual Mono Amp so you need to have A1 Interconnect for the SDA to work correctly.

I got M-508 and P-308 too but no SDA.

Welcome to the Forum!

10bad10

ok wait so can i use my one 508 with my Srss with the interconnect that came originally with the speakers? Will it blow sumthin? What if i run it without the interconnect...... lol i just want to hear my polkies.... someone help quick


ps im using monster Z2 biwire 10'

-David

nooshinjohn

do not run the interconnect yet and you will be fine

megasat16

10bad10 wrote: »

ok wait so can i use my one 508 with my Srss with the interconnect that came originally with the speakers? Will it blow sumthin? What if i run it without the interconnect...... lol i just want to hear my polkies.... someone help quick


ps im using monster Z2 biwire 10'

-David

You can run without interconnect cable but you'll not get any SDA effects.

I don't think running the SDA with M-508 without Interconnect will blow up anything if the polk you got are good. But I would exercise caution and will not crank up too much. Use Volume Control on your Preamp With Care during testing!

michaeljhsda2

Can you take some pics of the front and back, especially the label showing the wiring configuration and a pic of the binding post cup? Is the interconnect socket blade/blade or pin/blade? If it's pin/blade you have at minimum 1.2's. If the tweeters are SL 3000's you have the 1.2 TL's no matter if your crossover plate has 13 screws or not.

michaeljhsda2

10bad10 wrote: »

Hey guys thanks for all the help. Im always looking to pick up another M-508 and now i really have a reason. I just got the Polkies today off of CL but was keeping it quiet until they were home. How can i figure out if i have SRSs, 1.2s or 1.2tls? Im alittle new to SDA.... always wanted a pair and never expected to get as good of a pair as i just did for $400 yes thats $400 (talked him down from $500).

p.s. speakers are 8.5 out of 10 and had both grills in nice conddition and the interconnect cable. He also gave me some monster cable and a moving blanket to cover theem with lol. Man am i out off my mind stoked.... o yeah only one 6.5 is blowwn out of the 16... i d/ced it and am going to attempt to fire them up wwith my M-508. Anything i should know/do before take off.

Sorry for the long post i ramble when im excited

-David

Reconnect the driver!!! Even if it's blown it should be connected as the drivers are wired in series. Note that not all the drivers will produce the same level of sound so it may in fact be working. I'm not doubting you...just saying it's possible. No matter what that driver should be reconnected. Make sure there is a jumper wire between the high and low binding posts

megasat16

10bad10 wrote: »

ps im using monster Z2 biwire 10'

-David

I forgot to add one thing - You know you shouldn't be using Bi-Wire Cables with both speaker A and B output simultaneously, right? It may be OK for a while but not advisable since it may be using the amps to drive lower impedance load than it can handle.

Do not attempt to use Bi-Amp using Bi-Wire Cable and Both Speakers (A and output at the same time. Just use Bi-wire cable with either Speaker A or B output so it can handle impedance drops down to 4 ohms without problems.

I know M-508 is a very sturdy amp and it'll protect itself from catastrophic failures but it's better to protect your own gears first when testing things out.

michaeljhsda2

then install the interconnect cable, attach your amp to either the top or bottom binding posts and you're good to go.

michaeljhsda2

Make certain that your amp is common ground. If is not DO NOT RUN the amp on your speakers!!! Bad juju.

megasat16

No, this amp is not Common Ground. I have one M-508 and it's dual mono amp. I hope the OP didn't do anything drastic yet.

michaeljhsda2

michaeljhsda2 wrote: »

Reconnect the driver!!! Even if it's blown it should be connected as the drivers are wired in series. Note that not all the drivers will produce the same level of sound so it may in fact be working. I'm not doubting you...just saying it's possible. No matter what that driver should be reconnected. Make sure there is a jumper wire between the high and low binding posts

...jumper wires, not wire. Unless of course the jumpers wires are already on there

michaeljhsda2

megasat16 wrote: »

No, this amp is not Common Ground. I have one M-508 and it's dual mono amp. I hope the OP didn't do anything drastic yet.

AWWW crap. I hope not for his sake. :eek:

megasat16

Well, I don't think M-508 will give up first. It may goes into self-protect to prevent any major disaster. As long as he uses volume control with care, I doubt anything could let the smoke out.

michaeljhsda2

It's not a matter of volume control. Use of non-common ground amps will ruin his speakers and the amp. Under no circumstances should he use this amp on these speakers unless he uses an AI-1 interconnect.

megasat16

Yep! I looked at the Manual and it said it can damage both the amp and speakers if common grounded amp or AI-1 cables is not used.

So, I hope the OP looks at this thread again for his sake!

michaeljhsda2

He can run the amp on these speakers but ONLY IF THE INTERCONNECT CABLE IS NOT ATTACHED!!! Of course he won't get the SDA effect as everyone has mentioned.

megasat16

I got up and measured the negative binding posts from M-508 and guess what? It is common grounded. So, it may be OK for the OP to run without AI-1 cable with it.

10bad10

Ok im pretty sure i have regular srs'. They are blade/blade and have sl2000 in them. One 6.5 is frozen and i assume its a fried voice coil and one tweeter makes ungodly noises. I played them with my M-508 without my ic cable and using monster z2 bi-wire that goes from one set of +/- to two sets thus i thought making jumpers uneeded. Plus the jumpers that were in there were paper clips i think (the only other jumpers ive seen are to my rti12s and 70s and they look much different). So my question now is what do i need to start getting the sda effect? Im a newb so sorry about all the questions.

-David

michaeljhsda2

1. Correct. You have the regular SDA SRS.
2. You cannot use your amp on these speakers unless you disconnect the SDA cable (interconnect).
3. You cannot you use an AI-1 interconnect because they are not pin/blade.
4. You need jumpers in order for the tweeters and woofers to work. Use a short piece of speaker wire or strip off enough wire to run it straight through from the low frequency inputs to the high frequency inputs.

10bad10

So i still need jumpers even though my biwire takes up all 4 binding posts. Jumpers seem like a redundancy.... correct me if im totally just missing something. Also i want to get the SDA effect. What kind of amp do i have to use and would getting a 2nd 508 and biamping change anything? Im still trying to get my head around common ground and dual mono.... i know that my amp is dual mono but some people are saying its also common ground.

Thanks for all the info guys and thanks for being patient as i learn

-David

michaeljhsda2

“Also i want to get the SDA effect."

You will never get the SDA effect using the Onkyo amp because it is allegedly a non-common ground amp. You need to be absolutely certain whether the Onkyo amp is common ground or not. You need 100% confirmation regarding this issue. WARNING: If you run that Onkyo amp on your speakers with the interconnect cable attached "POOF" goes your amp and speakers. You have to find a common ground amp like a Carver TFM 35, TFM 35X, TFM 55, TFM 55X, TFM 42 just to name a few. Adcom is another good choice for not much coin. In fact there are countless amps out there that are common ground. Getting a 2nd 508 and biamping is irrelevant will not change a thing. Forget that idea completely.

WARNING: Jumpers MUST be removed when biamping. This applies to any common ground amp(s) that you hook up.

If you find an amp that is common ground see #4. This would apply to one amp being hooked up.

ben62670

Many dual mono's are still common ground. Take a multi meter and read the resistance across the grounds and if there is next to no resistance then you can strap the grounds. Call the amp manufacture if there are any questions. I run Adcom 565's which are mono blocks in separate chassis(two single channel amps). I can tie the grounds together on those no problem. Meaning run a wire from one amps speaker ground to the other amps speaker ground.