TLD 66 Specs *update* 7/23/14

[knightrider358]

Hey guys,

I have 2 tld66's now, i have the manual for them from the forum. But it does not give the maximum input volts allowed but even more importantly it does not give the max output volts.

Does anyone on here know what they are?

Also can signal voltage be measured with a dmm? If so how can it be done? DC, or with AC or Ohms, if with the latter, whats the formula to convert it to DC volts?

Any help would be great guys.

[trickyricky]

DC is something you don't want in your audio signal!!!!!!


So you will be using the AC setting to check the output signal. They are line drivers so they should be good for 6-8v.

[ttocs]

a meter really isn't what you want to measure the output with, an o-scope is the tool you need.

[knightrider358]

The prob w an o-scope is idk how to use it

[knightrider358]

Tricky, is that the rated volts of the tld 66?

[kg1961]

I always thought they would do 8 volts

[trickyricky]

They do 8vrms, you can use a true RMS DMM. You'll know when your clipping if your monitoring DC voltage (it will slightly increase to around a few hundred millivolts). Scope is nice but setting your TLD66 at 8v using a 1khz sine wave (having your amplifier unhooked or off) and a true RMS meter is good enough, many people get a -3db or 6db sine wave track when setting gains on amps, not sure if its needed on a line driver.

[vwdude]

I thought I read somewhere that it will do up to 9 volts, I might be mistaken.

[knightrider358]

So guys I used a true rms dmm to try to adjust the line driver. Heres what I came up with.

I used a 60hz tone to test and adjust everything. My HU is a pioneer premier deh-P880PRS. The HU is set up for 3way output. All the crossovers were set to flat except the HP would not go any lower than 1.5K hz. But I swaped rca outputs to my TLD66 to get that to be flat. Anyways the spec out on the HU is 5v preouts.

Keep in mind Im not messing with the amps at all, just tuning the TLD66 for now.

So with the HU at 3/4 (48 out of 64) my DMM is reading 4.9Vrms. Now when I checked the outputs of the TLD66 with this input I am getting 0v all the way up to 15.96V with the pots turned all the way up.

So couple questions for everyone.

So is the actual signal rms output of the tld66 able to do over 15V?

If an amp can only take 8Vrms signal what would it do to the amp if a higher signal was being fed to it? Ive done this before and never saw an issue. I know the goal is to match signal strengths to achieve the best output of your amp. But what are the negatives to a higher volt input?

Tricky you said I should use a 1khz sine wave to tune the TLD66 w a DMM, why that freq when everyone says use a 60hz signal because of using AC to read the voltage output.

Any help from anyone would be greatly appreciated!

[vwdude]

I think you would get a lot of distortion, or at least it would be way too loud and you would end up with no volume variation. Imagine a deck that has volume that goes up to 30, it would be very loud at 5, so your range would something like 0-5, versus if the voltage was lower you'd be able to set like 15 or 20 as the loudest, so you have a range of say 0-20, so it would change in smaller increments.

I could be wrong, but I think that's what happens. I say distortion as you'd be overdriving the amp possibly, and maybe even the speakers.

[knightrider358]

I think you would get a lot of distortion, or at least it would be way too loud and you would end up with no volume variation. Imagine a deck that has volume that goes up to 30, it would be very loud at 5, so your range would something like 0-5, versus if the voltage was lower you'd be able to set like 15 or 20 as the loudest, so you have a range of say 0-20, so it would change in smaller increments.

I could be wrong, but I think that's what happens. I say distortion as you'd be overdriving the amp possibly, and maybe even the speakers.

That makes sense about not having much adjustment with your volume. What do you think about how I am adjusting it?

So I assume if I have an amp rated for 8v max input on the gain. Should I have the TLD66 adjusted for 8v rms output to the amp with the HU at 3/4 volume?

[trickyricky]

You can use whatever sinewave signal you wish....60-100hz for subwoofer duty and 1khz for mid and tweeter duty. So if your using ch 1-4 for mids and tweets, then use 1khz sine wave for those ch's....if 5-6 is for subwoofer then use a 60hz signal to set the gain on those ch's.

Like I mentioned before, I would set it for 8-9v, yes its capable of more but call that headroom (for the line driver...to ensure any other dynamic signals are clean at 3/4volume on the HU).

Did you bother checking the DC voltage when you where getting the 15vac? Am pretty sure it was in above 100mv. This is where the scope comes in handy to make sure your signal is free from clipping.


If you set it at 15vac, it will be too much for the line driver and your amps, you'll easily clip any signal other than the sine wave you used.